whats-best.ai

Conversion Optimization

FullStory

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Panel rating · 6 judges · How to read the stars

Category median

Sovereignty: not determined

0–5 in half steps. 5 means the rubric's top anchor is met on the evidence.

by FullStory, Inc. · www.fullstory.com

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FullStory: AI-assisted analysis on whats-best.ai FullStory: AI-assisted analysis on whats-best.ai (dark)

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FullStory at a glance

Vendor
FullStory, Inc.
Headquarters
Not stated on the vendor’s pages as of 27 Oct 2026
Data hosting
Not stated on the vendor’s pages as of 27 Oct 2026
Free plan
Not stated on the vendor’s pages as of 27 Oct 2026
Panel verdict
The AI panel rates FullStory 1/5, the mean of 6 judges. The captured pages present FullStory as a behavioural analytics platform — session replay, heatmaps, funnels — rather than a testing product. how scores are made
As of
Vendor pages captured 27 Oct 2026; evaluated by the panel 27 Oct 2026. all sources

FullStory alternatives, European ones first →

Read this page as one judge. Each weighs the same scores by what they care about.

The panel's verdict

The captured pages present FullStory as a behavioural analytics platform — session replay, heatmaps, funnels — rather than a testing product. Scoring is strongest on data and integrations, clustering at 6-7: an open developer API, out-of-the-box integrations, analytics-ready warehouse views and raw event data via cloud storage are documented. It is weakest on experimentation scope, statistical rigour (0) and performance impact (0): we found no public information on A/B testing, a visual editor, named statistical methods, script size or Core Web Vitals. Consent and tracking scored 2-3: first-party cookies and local storage for sessions, honoured Global Privacy Control and Do Not Track signals, and a persistent opt-out cookie are documented, with nothing published on the script's pre-consent behaviour. Sovereignty ranges 1-3: the contracting entity is FullStory, Inc. and the privacy policy states personal information may be collected, processed and stored in the United States and other countries; lower scores point to no public information on EU residency or a named subprocessor list, higher ones credit stated Data Privacy Framework compliance. No prices are published; buying runs through a demo request.

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Speaks for it

  • Data and integrations scored 6-7, with a documented open API, out-of-the-box integrations, analytics-ready warehouse views and raw event data via cloud storage
  • Consent and tracking scored 2-3, with first-party cookies and local storage for session continuity, honoured Global Privacy Control and Do Not Track signals, and a persistent opt-out cookie
  • Predictive models such as churn prediction and customer lifetime value are documented, built on behavioural data joined with warehouse metrics
  • The privacy policy states customer and user data is not sold to third parties and that identification across disparate, unrelated domains is not attempted

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Held against it

  • Experimentation scope scored 0-1, with no public information on A/B or split testing, a visual editor, server-side SDKs or feature flags
  • Statistical rigour scored 0, with no public information on a named statistical method, sample-size guidance or protections against peeking or sample-ratio mismatch
  • Performance impact scored 0, with no published figures on script size, loading behaviour or Core Web Vitals
  • Sovereignty scored 1-3, with FullStory, Inc. as contracting entity, processing and storage possible in the United States and other countries, and no public information on EU residency or a named subprocessor list
  • No prices, tiers or traffic metric are published; the documented buying path is a demo request

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Best for

  • You need behavioural analytics — session replay, heatmaps, funnels, journey maps — to find where visitors struggle
  • Your team wants raw event data and analytics-ready views landing in its own warehouse or cloud storage for re-analysis and predictive models
  • You want an open developer API and out-of-the-box integrations to blend behavioural data with CRM and marketing automation tools

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Avoid if

  • You need to run A/B or split tests behind feature flags — experimentation scope scored 0-1 on the documented pages
  • You must defend results with documented statistics — ask the vendor: the public pages we read do not show it
  • Your visitor data must remain in the EU — the pages state processing and storage may occur in the United States and other countries, and we found no public information on EU data residency

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The scores

Panel median The median of the judges’ scores per criterion. Each label opens its reasoning below.
Scores per criterion, in stars out of 5
Criterion Panel median
Experiment types & delivery 0 of 5
Statistical method & guardrails 0 of 5
Consent & visitor tracking 1.5 of 5
Snippet performance & flicker 0 of 5
Analytics, data export & integrations 3 of 5
European sovereignty 1 of 5

Experiment types & delivery

Show reasoning
How this is scored

What can be tested and where: client-side changes through an editor, server-side and feature experiments through SDKs, multivariate and multi-page tests, and personalisation — judged on what the documentation shows rather than on the feature grid.

0 — Simple A/B split of one page element through a visual editor; no server-side option, no targeting beyond URL.

3 — Client-side A/B and split-URL tests with basic audience targeting, and no SDK or server-side delivery.

5 — Client-side and server-side experiments through documented SDKs for common languages, multivariate and multi-page tests, audience targeting on behaviour and attributes, and rule-based personalisation.

8 — Feature-flag-based experiments sharing one audience and metric model with web tests, mutually exclusive experiment groups, holdouts, edge or CDN delivery, and personalisation that can itself be tested against a control.

10 — One experimentation programme across every surface: web, app, server and edge from the same platform, experiment interactions managed, a documented experiment lifecycle from hypothesis to archived result, and a library of past results a team can search.

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The Growth Lead

I found no public information on a visual editor, variant delivery, feature flags, SDKs or multivariate and multi-page tests — the published feature list is session replay, heatmaps, funnels, journey maps and rage clicks, so my team would have no way to run a test at all. The one personalisation phrase, activating data to create personalized user experiences, is described as a data destination with no evidence of variants served and measured against a control. 1 6

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The E-Commerce Manager

The captured pages sell session replay, heatmaps and funnels, and speak of activating data for personalised experiences, but I found no public information on split testing, a visual editor, server-side delivery or personalisation that can be tested against a control. Every layout change on my product pages has to prove itself against a control, and nothing here shows a testing capability. 1 5 6

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The Product Engineer

The captured feature list covers session replay, heatmaps, funnels and dashboards, and we found no public information on A/B tests, a visual editor, server-side SDKs, feature flags or multivariate experiments; the only personalisation wording is a data-activation tagline with no testable control. As a platform to run experiments behind flags, this shows me nothing to work with. 1 5

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The CRO Consultant

Every documented capability is behavioural analytics — session replay, heatmaps, funnels and user segments — and while the vendor advertises activating data to create personalised experiences, we found no public information on A/B or split testing, a visual editor, server-side SDKs, feature flags or mutually exclusive experiments. On this evidence I cannot recommend the platform to a client who needs to run even a single test. 1 5

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The Data Protection Officer

The captured pages present session replay, funnels, journey analytics and a data-activation feature for personalised experiences, but we found no public information on any A/B test, a visual editor, an SDK for server-side delivery, or how a variant would be assigned to a visitor. 1 5 6

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The Skeptic

The captured pages present session replay, funnels, heatmaps and a data-activation message about personalised experiences, but we found no public information on A/B or split tests, a visual editor, server-side SDKs, feature flags or multivariate experiments. As documented, nothing here describes running a controlled test on any surface. 1 6

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Statistical method & guardrails

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How this is scored

Which statistics decide the winner and what protects the customer from misreading them. Scored on what the vendor documents: the method by name, how peeking and multiple comparisons are handled, and whether sample ratio mismatch is detected.

0 — A "winner" or "probability to beat" figure with no documented method, no stated sample-size guidance and no warning against stopping early.

3 — The method is named (frequentist or Bayesian) but its assumptions are not documented, and nothing prevents a test from being called while it is still underpowered.

5 — Documented method with confidence or credible intervals, a sample-size or test-duration calculator, and stated guidance on when a result may be read.

8 — Sequential testing or an equivalent documented protection against peeking, correction for multiple metrics or variants, sample ratio mismatch detection, variance reduction such as CUPED, and guardrail metrics that can stop a harmful test.

10 — The statistics are auditable: methodology published in enough detail to reproduce a result, the choice of method explained per use case, raw per-visitor data available for independent re-analysis, and the interface refuses to present an underpowered result as a conclusion.

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The Growth Lead

I found no public information on a testing method, sample-size or test-duration guidance, or any mechanism that would decide a winner; the closest content is funnels and conversions plus predictive models such as churn prediction and customer lifetime value, none of which documents statistics I could defend to the board. Without a named method there is no result to audit. 1 6

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The E-Commerce Manager

I found no public information on a named statistical method, sample-size or test-duration guidance, or any protection against reading a result too early. Since the pages describe analytics rather than experiments, there is no documented way a winner would even be decided. 1 6

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The Product Engineer

We found no public information on any testing method — no named statistics, no confidence or credible intervals, no sample-size or duration guidance, nothing on peeking, multiple comparisons, variance reduction or sample ratio mismatch. The captured analytics features are descriptive funnels, not experiments with winners. 1

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The CRO Consultant

The pages document funnels and conversions plus predictive models such as churn, but we found no public information on a named statistical method, sample-size or duration guidance, protection against peeking, or sample ratio mismatch detection. Without a documented method I could not defend a single result to a client. 1 6

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The Data Protection Officer

We found no public information on a statistical method, confidence or credible intervals, sample-size guidance, or any protection against calling an underpowered result; the pages list dashboards and funnels and predictive models, but never document how a winner or an effect would be decided. 1 6

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The Skeptic

Funnels and conversions, dashboards and AI anomaly detection are listed, but we found no public information naming a statistical method, intervals, sample-size guidance, or any protection against peeking, multiple comparisons or sample-ratio distortion. No winner-deciding procedure is documented, so there is nothing for a reviewer to audit or a customer to misread. 1 6

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Snippet performance & flicker

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How this is scored

The cost the client-side snippet imposes on the page it tests: blocking load, flicker of original content, script weight and the effect on Core Web Vitals — scored on what the vendor measures and publishes, not on "lightning fast".

0 — A synchronous snippet with no stated size, no flicker handling and no mention of performance.

3 — An anti-flicker snippet that hides the page until the test loads, with a timeout, and no published figures for script size or load cost.

5 — Script size and loading behaviour documented, asynchronous loading option, flicker handling explained with its trade-off, and CDN delivery of the snippet.

8 — Published performance figures including impact on Core Web Vitals, a self-hosting or first-party-domain option for the script, per-project bundles containing only active experiments, and a server-side or edge alternative for flicker-sensitive tests.

10 — Performance is a stated commitment: measured overhead published and maintained, flicker eliminated by edge or server-side rendering as a documented path, and tooling that shows the customer what their own configuration costs the page.

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The Growth Lead

I found no published figures for script size or load cost, and no public information on loading behaviour, flicker handling or Core Web Vitals impact. The capture technology is named on the platform pages but its cost to the page we would instrument is not shown anywhere I can verify. 1

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The E-Commerce Manager

A tenth of a second on my product pages shows in the conversion rate, and I found no public information on the capture script's weight, loading behaviour, flicker handling or any measured effect on Core Web Vitals. The capture technology is named on the homepage without a single published figure. 1 6

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The Product Engineer

"Fullcapture" is listed as a feature and we found no public information on script size, loading behaviour, asynchronous options, flicker handling or Core Web Vitals impact. Nothing published lets me estimate what the snippet costs a page. 1

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The CRO Consultant

We found no public information on script weight, loading behaviour, flicker handling, or any measured effect on Core Web Vitals; the captured feature list names capture and privacy defaults but publishes no performance figures. Nothing here lets me estimate what the snippet would cost a client's page. 1

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The Data Protection Officer

A capture capability is named on the homepage with no figures attached, and we found no public information on script size, loading behaviour, flicker handling, self-hosting, or any measured effect on Core Web Vitals. 1

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The Skeptic

A capture capability is listed by name among the features, but we found no public information on script size, blocking or asynchronous loading, flicker handling or any measured effect on Core Web Vitals. An unmeasured cost is indistinguishable from zero only in marketing. 1

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Analytics, data export & integrations

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How this is scored

Getting results and raw data out: integration with analytics and tag management, export of visitor-level results, warehouse-native analysis, and an API — because an experiment result that cannot be checked in the customer's own data is a claim, not a finding.

0 — Results visible in the vendor's dashboard only; no export, no analytics integration, no API.

3 — CSV export of aggregated results and one analytics integration, with no visitor-level data and no documented API.

5 — Integrations with common analytics and tag managers, export of results, and a documented API for managing experiments and reading results.

8 — Visitor-level raw data export or streaming to a data warehouse, warehouse-native analysis on the customer's own metrics, CDP integration for audiences, and an API with stated limits.

10 — The platform treats the customer's warehouse as the source of truth: metrics defined once and computed there, full historical experiment data exportable in open formats, and a versioned API a team can build its own programme tooling on.

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The Growth Lead

This is the strong axis: a documented developer API with out-of-the-box integrations, warehouse exports of simplified analytics-ready views, raw event data via cloud storage exports, and behavioural data blended with CRM, marketing automation and analytics tools. What holds it back is that I found no stated API limits, and the warehouse story is told through predictive models rather than analysis defined on our own metrics. 5 6

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The E-Commerce Manager

This is the strong side: an open API with a growing set of out-of-the-box integrations, warehouse exports of simplified analytics-ready views, cloud-storage exports of raw event data, and predictive models built on behavioural data joined with my own warehouse metrics. I found no public information on stated API limits or on streaming audiences to a CDP. 1 5 6

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The Product Engineer

The strongest area: a documented open API and Developer API, warehouse exports with simplified analytics-ready views, cloud storage exports that provide raw event data, and behavioural data combinable with the customer's own warehouse metrics for predictive models. We found no public information on stated API limits, CDP integration for audiences, or metrics defined once and computed in the warehouse as the source of truth. 5 6

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The CRO Consultant

This is the strong suit: an open developer API with out-of-the-box integrations is documented, warehouse exports provide simplified analytics-ready views, cloud storage exports provide raw event data for maximum flexibility, and the vendor describes combining behavioural data with the customer's own warehouse metrics. We found no public information on stated API limits or CDP-style audience export, so it stops short of a fully warehouse-native programme a client could build on. 5 6 1

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The Data Protection Officer

An open developer API and out-of-the-box integrations are documented, and the warehouse page describes exports of simplified analytics-ready views plus raw event data to cloud storage, with behavioural data blended into CRM, marketing automation and analytics tools. We found no public information on stated API limits, visitor-level streaming rates, or named tag-manager integrations. 5 6 1

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The Skeptic

An open developer API, out-of-the-box integrations, and exports that include raw event data through cloud storage alongside analytics-ready warehouse views are documented, and raw data a team can re-analyse is the part I credit. We found no public information on stated API limits, CDP integration for audiences, or metrics defined once and computed entirely in the customer's own warehouse. 1 5 6

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European sovereignty panel opinion

Show reasoning
How this is scored

Where visitor data is processed and stored and who the contracting entity is. Independently sourced by the sovereignty pipeline; weighted higher here than in categories that hold only the customer's own data, because the script runs on every visitor to the customer's site and their behaviour is what the platform records.

0 — Non-EU vendor and contracting entity, hosting unstated, subprocessors unnamed, and visitor data leaving the EU without a stated safeguard.

3 — EU data residency offered as an option or an enterprise add-on while the contracting entity is non-EU, or the subprocessor list is absent.

5 — EU processing of visitor data as standard and an EU contracting entity, but parts of the chain — CDN, support access, analytics — are non-EU without an explained safeguard.

8 — EU hosting on named infrastructure including the delivery of the snippet, EU contracting entity, subprocessor list published, and a DPA covering the visitor data the script collects.

10 — Sovereign end to end and evidenced: vendor, entity, hosting, snippet delivery and every subprocessor European, certification published, and no visitor data reaching a non-EU party at any point.

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The Growth Lead

The contracting entity is FullStory, Inc, an American company with offices listed in Atlanta, London, Sydney and Singapore, and the privacy policy states personal information may be collected, processed and stored in the United States and other countries — visitor behaviour from our German sites would cross the Atlantic. I found no public information on an EU residency option, subprocessors appear only as share categories rather than a named list, and the only EU-facing safeguard claimed is membership of the EU-U.S., UK and Swiss Data Privacy Frameworks. 3 4

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The E-Commerce Manager

The contracting entity is Fullstory, Inc with Atlanta among its offices, and the privacy policy says personal information may be collected, processed and stored in the United States and other countries, with compliance claimed under the EU-U.S., UK and Swiss-U.S. Data Privacy Frameworks. I found no public information on EU data residency for the visitor data the script records, and no published subprocessor list — only categories of recipients. 2 3 4

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The Product Engineer

Contracting is with FullStory, Inc. of Atlanta, and the privacy policy states personal information may be collected, processed and stored in the United States and other countries, with the EU-U.S. Data Privacy Framework cited for transfers. We found no public information on EU residency, EU hosting of snippet delivery, or a named subprocessor list — only broad categories of service providers and partners. 3 4

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The CRO Consultant

The contracting entity is FullStory, Inc. with its offices listed in Atlanta, and the privacy policy states personal information may be collected, processed and stored in the United States and other countries, with compliance to the EU-U.S. Data Privacy Frameworks offered as the transfer safeguard. We found no public information on EU data residency or a named subprocessor list — only service-provider categories are given — so I could not contract this for a client whose visitor data must stay in Europe. 4 3

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The Data Protection Officer

Visitor data may be collected, processed and stored in the United States by FullStory, Inc., an Atlanta company, with EU–U.S. Data Privacy Framework membership as the stated transfer safeguard. We found no public information on an EU residency option, and only categories of service providers — billing, IT, hosting, payments — are named, with no published subprocessor list that would cover the CDN delivering the script. 4 3 2

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The Skeptic

The contracting entity is Fullstory, Inc, a US company, and the privacy policy states personal information may be processed and stored in the United States and other countries. The pages name sharing categories rather than a published subprocessor list, the only stated transfer safeguard is Data Privacy Framework membership, and we found no public information on EU data residency for the script that runs on every visitor. 3 4

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Pricing transparency not rated — the vendor publishes no price

Show reasoning
How this is scored

A category priced by traffic — monthly tracked users, visitors or impressions — where the tier a site lands in depends on numbers the buyer has to estimate. Whether a buyer can compute the real annual cost including traffic limits, overage, server-side or personalisation modules and seats — from public pages alone.

0 — No public prices at all; every tier is a sales conversation.

3 — A starting price or a free tier exists, but the traffic metric, the limits and what happens above them are unstated — the invoice is unknowable.

5 — Tier prices public with the traffic metric and its limits defined, but at least one commonly needed piece (server-side SDKs, personalisation, overage) is unpriced or "contact sales".

8 — Every tier priced publicly with the traffic metric defined, limits, overage rates, module prices, minimum term and VAT treatment stated.

10 — Complete price computability: annual invoice derivable for a given traffic volume, set of modules and team size, with overage and every add-on published.

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The Growth Lead

I found no public prices at all — no tiers, no traffic metric, no limits, no free tier; the captured route to buying is a demo request form where an expert gets in touch. That makes the annual invoice impossible to compute from public pages before the sales conversation. 5 6

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The E-Commerce Manager

The captured pages show no prices, no traffic metric, no tiers and no free entry point — the buying path is a demo request where "an expert will be in touch." With my traffic jumping every December, the annual invoice is unknowable from public pages. 1 5

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The Product Engineer

The captured pages show a demo request form where an expert gets in touch, and we found no public information on tier prices, the traffic metric, limits or overage. Every tier is a sales conversation. 5 6

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The CRO Consultant

We found no public prices at all: no tiers, no traffic metric such as monthly tracked users or sessions, no limits, no overage terms — the captured pages lead only to a personalized demo request. For a buyer who must estimate the real annual cost before the contract, everything here is a sales conversation. 5 6 1

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The Data Protection Officer

We found no public prices, tiers or traffic metric on the captured pages; the only documented commercial path is a personalized demo request where an expert gets in touch, so the annual invoice is unknowable in advance. 5 6

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The Skeptic

We found no public information on prices, tiers, the traffic metric, limits or overage treatment. The captured pages route buyers to a request for a personalized demo, so the invoice is unknowable from public pages. 5 6

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European sovereignty — proven facts

0 of 4 dimensions proven

Built only from facts shown on the vendor's own pages. A dimension we could not prove is left open, not scored as zero.

Ownership Not determined — uncited Report an error
Data residency Not determined — uncited Report an error
Subprocessors Not determined — uncited Report an error

Questions about FullStory

Is FullStory European?

Not determined: the vendor’s pages as captured do not say where FullStory is based.

Where does FullStory store data?

Not stated on the vendor’s pages as of 27 Oct 2026.

Does FullStory have a free plan?

Not stated on the vendor’s pages as of 27 Oct 2026.

What are the best alternatives to FullStory?

As of 27 Oct 2026, the panel rates Convert Experiences (3.5/5), GrowthBook (3/5) and Varify.io (3/5) highest among the other 34 Conversion Optimization products evaluated. Ratings that look equal are rounded to half stars; the order uses the unrounded rating, then the name. The highest-rated European alternative is Varify.io (EU-Made). Ratings are the AI panel’s opinion, formed from public evidence: how scores are made. The full list, with European products first: FullStory alternatives.

Where this could be wrong

What we left out

A claim that does not survive our checks costs us the claim, not the page. This is what was taken off this one.

Sources (6)

The pages every claim on this page was read from — each one checked, dated, and kept verifiable.

  1. 1 Vendor page www.fullstory.com Checked 27 Oct 2026 Details →
  2. 2 Legal notice — found from the homepage www.fullstory.com Checked 27 Oct 2026 Details →
  3. 3 Consent & visitor tracking — found from sitemap www.fullstory.com Checked 27 Oct 2026 Details →
  4. 4 Consent & visitor tracking — found from sitemap www.fullstory.com Checked 27 Oct 2026 Details →
  5. 5 Analytics, data export & integrations — found from sitemap www.fullstory.com Checked 27 Oct 2026 Details →
  6. 6 Analytics, data export & integrations — found from sitemap www.fullstory.com Checked 27 Oct 2026 Details →