Email Marketing & Newsletter

Klaviyo

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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.

An AI-assisted analysis of public evidence — not a hands-on test.

Every score, rationale and verdict on this page is AI-generated. Every claim cites the source it was read from. Nothing here is a human star review — and no score can be bought. How scores are made →

Method and versions

The CRM Manager v1.0 · The Deliverability Engineer v1.0 · The Data Protection Officer v1.0 · The Shop Owner v1.0 · The Integrator v1.0 · The Skeptic v1.0 · rubric v1 · evaluated 30 Sep 2026

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

The Data Protection Officer

Weighted verdict

Signs off the tool that holds named people and records what each of them opened. Wants double opt-in with a proof that survives a complaint, tracking that can be switched off, and an answer to where the behavioural data lives that does not require a Schrems II argument.

Same scores as the panel view — this lens weights them the way this judge cares.

Scored by The Data Protection Officer

Campaigns & automation

How this is scored

Building the mail and the journey around it: editor, templates, segmentation, triggered sequences, A/B testing.

0 — One-off broadcasts from a fixed template; no segmentation and no automation of any kind.

3 — A drag-and-drop editor and simple list segmentation, but automation is a single welcome mail and there is no testing.

5 — Reusable templates, attribute and behaviour segmentation, multi-step automations on common triggers, and subject-line A/B testing.

8 — A visual journey builder with branching on behaviour and data, dynamic content per segment, send-time optimisation, and testing that reports significance rather than raw counts.

10 — Journeys treat the whole lifecycle: event-driven entry from other systems, branching on any attribute or event, holdout groups for measurement, and automations a marketer can read months later without a diagram.

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The Data Protection Officer

Segmentation is the documented strength: real-time segments on demographics, browsing behaviour, purchase history and custom properties with unlimited conditions, plus predictive and AI-generated segments, alongside 60+ prebuilt flows and 150+ email templates on a drag-and-drop editor. We found no public information on A/B testing with significance reporting, journey branching on behaviour and data, or send-time optimisation, so this sits above basic list-and-welcome tooling but well short of a fully evidenced journey platform. 6 11 2

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Deliverability infrastructure

How this is scored

Whether the mail arrives — authentication, sending reputation, bounce and complaint handling — judged on what the vendor documents rather than the inbox rate it advertises.

0 — No documentation of authentication or bounce handling; deliverability appears only as a marketing number.

3 — SPF and DKIM setup documented, but no DMARC guidance, no stated bounce policy and shared sending only.

5 — SPF, DKIM and DMARC documented with a custom sending domain, automatic hard-bounce suppression, and complaint-loop handling stated.

8 — The above plus dedicated-IP options with a documented warm-up, seed or inbox-placement testing, engagement-based sunsetting, and published guidance on list hygiene.

10 — Deliverability is operated as a service: reputation monitoring surfaced to the customer, per-domain and per-ISP diagnostics, enforced authentication before first send, and postmaster or blocklist handling the vendor documents doing on the customer's behalf.

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The Data Protection Officer

There is a real public deliverability guide covering bounce types and where they are found in the product, spam traps and blacklists, sending infrastructure and the pros and cons of double opt-in, plus guidance that one complaint per 1,000 messages is where mailbox providers consider a sender elevated and a documented 30-day dedicated-IP warm-up. We found no public information on SPF, DKIM or DMARC setup documentation, automatic hard-bounce suppression, or complaint-loop handling, which is what would raise this further. 7

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Consent, proof & tracking limits

How this is scored

How subscribers arrive and what the sender can prove afterwards: double opt-in, logged consent, unsubscribe handling, and whether open and click tracking can be limited or switched off.

0 — Single opt-in with no consent record; tracking is always on and cannot be disabled.

3 — Double opt-in available but not the default, and the consent record is a timestamp without the source, IP or the wording consented to.

5 — Double opt-in as the documented default with a stored consent record including source and timestamp, one-click unsubscribe, and tracking that can be turned off per campaign.

8 — Consent is reproducible as evidence: the confirmation mail and form wording versioned and retrievable per subscriber, unsubscribe honoured across lists, tracking off-by-default available, and retention rules for inactive subscribers.

10 — Built for the burden of proof: a per-subscriber consent history an authority would accept, documented handling of Art. 15 access and Art. 17 erasure requests, pixel-free and link-tracking-free sending as a supported mode, and preference-centre granularity rather than all-or-nothing.

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The Data Protection Officer

But we found no public information on double opt-in being offered as a documented default (the deliverability guide only weighs its pros and cons), on open and click tracking being limitable or switchable off, on pixel-free sending, or on preference-centre granularity and retention rules for inactive subscribers. 4 8 7

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List ownership, import & exit

How this is scored

Whether the list and its history remain the sender's: import with attributes intact, full export including engagement history, deletion that executes, and no metering that prices leaving out of reach.

0 — Export is addresses only; engagement history, segments and automations cannot leave.

3 — CSV import and export of subscriber fields, but engagement history and unsubscribe state are not exportable.

5 — Full subscriber export including custom attributes, subscription status and unsubscribe state, plus API access sufficient to sync elsewhere.

8 — Everything exportable in open formats — subscribers, engagement history, campaigns and templates — with documented deletion of a subscriber across all records, and no export throttling.

10 — Exit is a documented feature: full-fidelity export of the whole account, contractual data return, deletion that is evidenced rather than asserted, and migration tooling in both directions.

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The Data Protection Officer

Exit hygiene is contractually documented: all customer personal data is deleted within 90 days of termination with return on request, individual profiles can be found, exported or deleted from the unified profile store, and the deletion log doubles as evidence of compliance. We found no public information on bulk export of the full list with custom attributes, engagement history or unsubscribe state, on campaigns and templates leaving in open formats, or on migration tooling in either direction — the parts that keep the list portable while the sender is still a customer. 5 4 8

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Integrations & API

How this is scored

The connection surface a newsletter lives on: shop and CRM systems, events in and out, webhooks, and an API somebody can build against without a partner agreement.

0 — No API and no named integrations; the list is maintained by CSV upload.

3 — A handful of native integrations and a read-mostly API, with no webhooks and no documented rate limits.

5 — Named integrations for common shop and CRM systems, a documented REST API with keys, and webhooks for the core subscriber events.

8 — Maintained bidirectional integrations with named systems including at least one major shop platform, event webhooks with retries, documented rate limits, and a sandbox.

10 — The tool is a component rather than a destination: transactional and marketing sending on one API, events flowing both directions, versioned API with a deprecation policy, and integrations the vendor maintains rather than lists.

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The Data Protection Officer

The surface is broad: more than 350 prebuilt integrations, a native and maintained Shopify partnership claimed across 117,000+ shared customers, and developer tooling spanning APIs, webhooks, SDKs and warehouse syncs. It falls short of the top tier because rate limits are set and enforced at the vendor's sole discretion rather than documented, we found no public information on a sandbox or webhook retries, and the API terms reserve the right to modify or stop supporting the APIs at any time without notice. 11 1 1 10

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European sovereignty

How this is scored

Where subscriber data and behavioural tracking live, who the contracting entity is, and which subprocessors touch the send. Independently sourced by the sovereignty pipeline; scored here as this buyer weighs it — which in this category is heavily.

0 — US vendor and contracting entity, US hosting, subprocessors unnamed; subscriber behaviour leaves the EU with no stated basis.

3 — EU hosting offered as an option or for storage only, while sending, tracking or support access remains non-EU, or the subprocessor list is absent.

5 — EU hosting as standard and an EU contracting entity, but parts of the chain — sending infrastructure, analytics, support tooling — are non-EU without an explained safeguard.

8 — EU or DACH hosting with a named data-centre provider, EU contracting entity, complete subprocessor list published, and any non-EU processing named with its legal basis.

10 — Sovereign end to end and evidenced: vendor, entity, hosting, sending and every subprocessor in the EU, certification published, and no transfer that needs a Schrems II argument to survive.

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The Data Protection Officer

The contracting entity is Klaviyo, Inc. of Boston under Massachusetts law, and the data processing agreement authorises storage and processing wherever Klaviyo or its subprocessors maintain facilities — worldwide, with no regional lock — so behavioural data on EU subscribers is processed in the United States. Transfers rest on the Data Privacy Framework certification and standard contractual clauses with Irish governing law, transfer impact assessment support, a stated willingness to challenge FISA 702 and Executive Order 12333 requests, and a referenced published subprocessor list; that is the complete US-vendor transfer package, and it still requires a Schrems II argument to survive — we found no public information on any EU hosting or residency option. 3 5 10 1 4

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Pricing transparency

How this is scored

Whether a sender can compute the real invoice for their list size and send volume — including overage, extra domains and automation limits — from public pages alone.

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

3 — A headline price per contact tier exists, but send limits, overage rates or the tier where automation begins are not stated.

5 — Contact-tier prices public with the billing period stated and send limits given, but at least one commonly needed capability sits in an unpriced tier or add-on.

8 — Every tier priced publicly with contact and volume limits, overage rates, feature boundaries and VAT treatment stated; only genuinely custom volume lacks a number.

10 — Complete price computability: a calculator producing the annual invoice for a given list size and send frequency, including overage, additional domains and dedicated IPs.

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The Data Protection Officer

The free tier is fully computable — up to 250 active profiles, 500 emails per month, mobile messaging worth 5 $ per month and 10,000 Composer credits — but the paid tiers are described only as scaling on contact count and channels used, with enterprise on custom quote. We found no public information on any paid price figure, overage rate, feature boundary or VAT treatment, so a buyer cannot compute an invoice for a real list size from the captured pages. 2 2 1 1

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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.

Legal entity	Not determined ⚠ unverified	—	uncited Report an error
Ownership	Not determined	—	uncited Report an error
Data residency	Not determined ⚠ unverified	—	uncited Report an error
Subprocessors	Not determined	—	uncited Report an error

Where this could be wrong

Evidence ages. The oldest capture behind this page is from 30 Aug 2026. Vendors change pricing and policies without notice; every fact reflects its source as of the capture date shown in the registry.
Weak sourcing — Legal entity, Data residency. Not confirmed on the vendor’s own pages as captured.
AI can misread a source. Extraction and judgement are automated; a citation guarantees traceability, not infallibility. If something here is wrong, say so — no account needed, every report is decided within 5 business days, and accepted corrections are published.

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.

45 product facts could not be confirmed on the vendor’s page as captured and were left out of this page and of the panel’s material. Know more? Tell us
19 compliance facts could not be confirmed on the vendor’s page as captured and were left out of this page and of the panel’s material. Know more? Tell us
13 pricing facts could not be confirmed on the vendor’s page as captured and were left out of this page and of the panel’s material. Know more? Tell us
4 support facts could not be confirmed on the vendor’s page as captured and were left out of this page and of the panel’s material. Know more? Tell us
3 data facts could not be confirmed on the vendor’s page as captured and were left out of this page and of the panel’s material. Know more? Tell us
3 integrations facts could not be confirmed on the vendor’s page as captured and were left out of this page and of the panel’s material. Know more? Tell us
3 legal facts could not be confirmed on the vendor’s page as captured and were left out of this page and of the panel’s material. Know more? Tell us
2 hosting facts could not be confirmed on the vendor’s page as captured and were left out of this page and of the panel’s material. Know more? Tell us
2 sovereignty dimensions could not be confirmed on the vendor’s own pages and are shown as unknown. Know more? Tell us
6 of the readings below were written against an earlier fact sheet — a fact has been corrected, added or pulled since. Until the panel next runs on this product you are reading the older judgement. Know more? Tell us

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Sources (11)

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

1 Vendor homepage www.klaviyo.com Checked 5 Oct 2026 +3 earlier captures: 16 Sep 2026, 11 Sep 2026, 30 Aug 2026 Details →
2 Pricing www.klaviyo.com Checked 5 Oct 2026 +4 earlier captures: 28 Sep 2026, 16 Sep 2026, 11 Sep 2026, 30 Aug 2026 Details →
3 Privacy policy www.klaviyo.com Checked 5 Oct 2026 +1 earlier capture: 28 Sep 2026 Details →
4 Security / trust page www.klaviyo.com Checked 5 Oct 2026 Details →
5 Legal notice www.klaviyo.com Checked 5 Oct 2026 Details →
6 Campaigns & automation — found from sitemap www.klaviyo.com Checked 5 Oct 2026 Details →
7 Deliverability infrastructure — found from sitemap www.klaviyo.com Checked 5 Oct 2026 Details →
8 Consent, proof & tracking limits — found from sitemap www.klaviyo.com Checked 5 Oct 2026 Details →
9 Consent, proof & tracking limits — found from sitemap www.klaviyo.com Checked 5 Oct 2026 Details →
10 Integrations & API — found from sitemap www.klaviyo.com Checked 5 Oct 2026 Details →
11 Integrations & API — found from sitemap www.klaviyo.com Checked 5 Oct 2026 Details →