Varify.io vs VWO

Varify.io

The documentation shows client-side A/B, redirect and split-URL tests, full-factorial multivariate and multi-page experiments, mutual exclusion and audience targeting, all served through the visual editor. Server-side A/B testing appears only as a feature listing, and we found no public information on documented SDKs, feature flags, holdouts or edge delivery, so the programme stays client-side in substance.

VWO

The captured pages show A/B/n, split and multivariate testing with a visual and code editor, multi-arm bandit and rollout campaigns, and personalisation and feature management as named modules. We found no public information on server-side SDKs, edge delivery or a documented experiment lifecycle, so this sits between the client-side editor level and the documented-SDK level even though mutually exclusive groups appear in the enterprise plan.

Varify.io

The default method is named and partly specified — a one-sided chi-square test for rates and a one-sided t-test for value metrics, with a Bayesian option in the Pro plan — and published guidance says to ignore interim results and run at least ten days with at least 500 conversions per variant. We found no public information on confidence or credible intervals, correction for multiple metrics, or sample ratio mismatch detection.

VWO

Guardrail metrics, sample ratio mismatch detection and multi-arm bandit campaigns are listed as plan features, which are genuine guardrails. We found no public information naming a statistical method, no sample-size or duration guidance, and nothing on how early stopping or multiple comparisons are handled.

Varify.io

The pages answer my standing question: the snippet can be integrated without consent, variants are played out directly, and tracking is triggered separately only after consent, with Google Consent Mode and consent-tool integration documented — a consent-pending separation I can work with. We found no public information listing the local storage keys with their lifetimes, on IP anonymisation, or on retention of visitor data, and the cookieless claim rests on the vendor's own reading that strictly necessary variant assignment needs no consent.

VWO

The privacy policy states in its own words that it applies only to the customer and not to the visitors of the customer's website, which puts consent and the visitor's device squarely in the customer's hands. We found no public information on what the script stores on the device, whether it may run before the consent banner is answered, any consent-pending mode, or any list of cookies and storage keys; the only visitor-relevant statement is that tracking can be stopped through an opt-out.

Varify.io

The snippet is published at 11.5 KB, head placement is recommended against flicker, and the optional anti-flicker script is documented with its configurable four-second hide and its stated negative effect on Core Web Vitals. We found no public information on an asynchronous loading option, CDN delivery of the snippet, self-hosting on a first-party domain, or measured figures for the snippet's own effect on Core Web Vitals.

VWO

CDN delivery of test requests on named providers is described, and a self-hosting option sits in the enterprise plan. We found no public information on script size, loading behaviour, flicker handling or any measured effect on Core Web Vitals.

Varify.io

Integrations with the common analytics and tag tools are documented alongside export of results, and the BigQuery integration delivers raw, line-by-line experiment data into the customer's own project without sampling — data the customer keeps under their own control. We found no public information on stated API limits or a CDP integration; the Experiment API is described only as an expert function.

VWO

Google Analytics is named in the privacy policy, integrations and pull-based integrations appear as plan features, data platform access is in the base plan, and API access sits in the enterprise tier. We found no public information on export of visitor-level results, warehouse or CDP integration, or documentation for the API with stated limits.

Varify.io

The contracting entity is German, hosting is claimed as Frankfurt for the product, and EU processors are named for some functions — but the residency statement sits in marketing copy while the privacy policy shows the website chain processing data with US providers, including Cloudflare processing in the USA. We found no public information on a subprocessor list for the hosted testing product itself, on its hosting provider, or on a data processing agreement covering the visitor data the script collects; SOC 2 is marked only as coming soon, and the imprint names Varify Software GmbH while the privacy policy names Varify GmbH as controller.

VWO

The contracting entities are Wingify Software Pvt. Ltd. in Delhi and Wingify Inc., and the policy states all customer data is stored centrally in Washington DC and Dallas; the CDN runs on IBM Softlayer and Google Cloud Platform with some European edge locations. A DPA, standard contractual clauses, a named DPO and an Article 27 EU representative are published, but we found no public information on a subprocessor list including the CDN, or any option for visitor data to be processed in the EU.

Varify.io

Tier prices are public with the traffic metric defined as unlimited monthly tracked users, limits for websites and active experiments stated, and a 15-day full-product trial without a credit card. Multiple domains are on request, AI features are billed in credits without a published price, VAT treatment is not stated, and the captured pages give different figures for the entry price — "For just €119 per month" on the homepage, "ab 199€/Monat" on the German page and 249 € monthly on the plans page.

VWO

The pricing page states there are no fixed plans, only a custom proposal built around goals and scope, and no tier price appears anywhere in the captures. The monthly-tracked-users metric surfaces only inside an FAQ question, and we found no public information on limits, overage or figures for the Predictive Data, Emotions and Data Studio add-ons; a free trial and the free-with-products AI plan are the only public price signals.