Testing · head to head
Kameleoon vs Vitest
Kameleoon
Testing
A/B testing and feature experimentation with a hybrid client and server-side engine
- From
- On request
- Rated
- -
The short version
- Only Vitest has a free tier, so it costs nothing to try first.
- Each has a real cost: Kameleoon no rate card is published. Reported entry pricing around several hundred euros a month for the limited prompt-based tier comes from third parties rather than Kameleoon, so any budget you build before contacting sales is a guess.; Vitest assumes Vite: projects on webpack or other bundlers lose the main advantage
- They diverge on capability: Kameleoon covers Visual A/B test editor, Vitest covers Shares Vite config.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Kameleoon and Vitest actually diverge.
Identical on both: user rating (Not yet rated), category (Testing).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Kameleoon
- Visual A/B test editor
- Server-side experimentation
- Feature flags
- Anti-flicker engine
- AI personalisation
- EU data hosting
- Shared audiences
- Statistics options
Only in Vitest
- Shares Vite config
- Jest-compatible API
- Fast watch mode
- ESM and TypeScript native
What people use each for
The jobs each tool is most often brought in to do.
Kameleoon
- A European retailer whose legal team requires EU-hosted experimentation data and has ruled out US-only vendorsnot Vitest
- A team running both marketing page tests and product feature rollouts that wants one results engine rather than two disagreeing onesnot Vitest
- A media site where client-side flicker on a test variant is visibly damaging the reading experiencenot Vitest
- An organisation re-tendering experimentation after Optimizely or VWO pricing changes and wanting an independent European vendornot Vitest
Vitest
- Unit testing an application already built with Vite, without a second build confignot Kameleoon
- Migrating from Jest for faster watch-mode feedbacknot Kameleoon
- Testing TypeScript and ESM code without transform configurationnot Kameleoon
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Kameleoon
- No rate card is published. Reported entry pricing around several hundred euros a month for the limited prompt-based tier comes from third parties rather than Kameleoon, so any budget you build before contacting sales is a guess.
- Web experimentation, feature experimentation and personalisation are licensed as separate capabilities, so the unified platform story costs materially more than the entry configuration most buyers are first quoted.
- The partner and agency ecosystem is concentrated in France and continental Europe; a buyer in North America or Asia will find fewer implementation specialists and less community knowledge than for Optimizely or VWO.
- The integration catalogue is smaller than the market leaders, so a stack built on less common analytics or CDP tooling may need custom work that a larger vendor would cover natively.
- Client-side visual testing still carries the structural problems of the approach, including performance cost and single-page-application fragility; the anti-flicker engine reduces the symptom but does not remove the dependency on the DOM staying stable.
Vitest
- Assumes Vite: projects on webpack or other bundlers lose the main advantage
- Younger than Jest, so some plugins and matchers in the Jest ecosystem have no equivalent
- Jest compatibility is close but not exact, and unusual Jest configurations still need work to port
Pricing, plan by plan
Kameleoon
On request- Kameleoon$undefined/year
- Priced on monthly tested users and features licensed
- Web experimentation, feature experimentation and personalisation licensed separately
- Free trial of the prompt-based experimentation feature, with data not retained afterwards
Vitest
Free- VitestFree
- Full functionality
- Unlimited tests
- Community support
Which should you pick?
Choose Kameleoon if
- You need visual a/b test editor.
- You work on Web, iOS, Android.
- You also want server-side experimentation.
Choose Vitest if
- You need shares vite config.
- You want to start without paying.
- You work on Linux, macOS, Windows.
- You also want jest-compatible api.
Questions people ask
- Is Kameleoon or Vitest better?
- Neither clearly leads. Kameleoon starts at On request and Vitest at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Kameleoon or Vitest?
- Vitest has a free tier; the other does not. Paid plans start at On request for Kameleoon and Free for Vitest.
- Does Kameleoon or Vitest run on more platforms?
- Kameleoon runs on Web, iOS, Android. Vitest runs on Linux, macOS, Windows.
- Can I use Vitest for free?
- Yes. Vitest has a free tier, so you can try it without paying. Kameleoon starts at On request.
- What is Kameleoon best used for?
- Kameleoon is most often used for a european retailer whose legal team requires eu-hosted experimentation data and has ruled out us-only vendors, a team running both marketing page tests and product feature rollouts that wants one results engine rather than two disagreeing ones, a media site where client-side flicker on a test variant is visibly damaging the reading experience, an organisation re-tendering experimentation after optimizely or vwo pricing changes and wanting an independent european vendor. Of those, a european retailer whose legal team requires eu-hosted experimentation data and has ruled out us-only vendors and a team running both marketing page tests and product feature rollouts that wants one results engine rather than two disagreeing ones are not what Vitest is typically brought in for.
- What can Kameleoon do that Vitest cannot?
- Kameleoon covers Visual A/B test editor, Server-side experimentation, Feature flags, Anti-flicker engine. Vitest covers Shares Vite config, Jest-compatible API, Fast watch mode, ESM and TypeScript native.
Answered from the vendors’ own pages
Kameleoon: Does Kameleoon publish pricing?
No. Pricing depends on monthly tested users and which capabilities you licence, and requires a sales conversation.
Vitest: Is Vitest free?
Yes, open source under the MIT licence.
Kameleoon: Can I keep data in the EU?
Yes. EU hosting and a GDPR-first consent model are among the main reasons European buyers shortlist it.
Vitest: Is Vitest compatible with Jest?
The API is deliberately Jest-compatible and most migrations are mechanical, though unusual configurations and some ecosystem plugins need attention.
Kameleoon: Does it do feature flags as well as A/B tests?
Yes, through server-side SDKs, sharing audiences and results with the visual testing side.
Vitest: Do I need Vite to use Vitest?
It works without a Vite app but the main benefit — sharing one config and transform pipeline — only applies if you are already using Vite.
Kameleoon: How does it compare with Optimizely?
Similar capability at a smaller scale. Kameleoon's advantages are European data residency and an independent vendor; Optimizely's are ecosystem size and partner availability.
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