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The best A/B testing tools for marketing and CRO agencies in 2026

For agencies in 2026: Luria runs tests for every client store without a CRO hire and shows each client the gain against a held-out control; Convert is built for agencies designing tests by hand across many sites; VWO and Optimizely suit larger client programs; Intelligems fits Shopify clients focused on pricing.

Updated October 28, 2026 by Baneet Singh, founder of Luria. Each tool is described from its own site; check their pages for current prices and features.

How to choose

• Many clients, one login. Separate data, controls and reports per client.
• Reports a client believes. Lift against a control shown to the same traffic at the same time, on the client's real orders.
• Labour. Hand-built tests cost strategist hours per client; done-for-you testing does not.
• Platform spread. Clients run Shopify, WordPress, Webflow and custom sites.

The tools

1. Luria

   One account for every client store: each gets its own held-out control, its own tests and a dashboard both sides can read. Luria writes and runs the tests, so an agency can offer CRO without hiring for it.

   Best for: Agencies adding CRO to retainers without adding headcount.

2. Convert

   An A/B testing tool for any website with a privacy focus and flicker-free delivery, popular with agencies and CRO consultants.

   Best for: CRO specialists and agencies who design and run tests by hand across many client sites.

3. VWO

   A broad conversion platform for any website: A/B, multivariate and split-URL testing, heatmaps, session recordings, surveys and personalization, with a visual editor (it agreed to combine with AB Tasty in January 2026).

   Best for: marketing and CRO teams who run their own research and testing program across many pages.

4. Optimizely

   An enterprise digital experience platform covering web experimentation, feature experimentation with server-side flags, and a CMS.

   Best for: large companies with product, engineering and analytics teams running experimentation programs.

5. Intelligems

   A Shopify testing app best known for price, shipping, offer and content tests aimed at profit per visitor.

   Best for: Shopify brands that want to design their own experiments, especially on price, discounts and shipping thresholds.

Deeper one-to-one comparisons: all A/B testing tools compared.