Is Flagsmith or Kameleoon better?

Neither clearly leads. Flagsmith starts at Free and Kameleoon at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, Flagsmith or Kameleoon?

Flagsmith has a free tier; the other does not. Paid plans start at Free for Flagsmith and On request for Kameleoon.

Does Flagsmith or Kameleoon run on more platforms?

Flagsmith runs on web, api. Kameleoon runs on Web, iOS, Android.

Can I use Flagsmith for free?

Yes. Flagsmith has a free tier, so you can try it without paying. Kameleoon starts at On request.

What is Flagsmith best used for?

Flagsmith is most often used for gradual feature rollouts across environments, remote configuration without redeploying code, running a/b tests tied to feature flags, self-hosting feature flags for data residency requirements. Of those, gradual feature rollouts across environments and remote configuration without redeploying code are not what Kameleoon is typically brought in for.

What can Flagsmith do that Kameleoon cannot?

Flagsmith covers Segments, A/B testing, Scheduled flags, SDKs. Kameleoon covers Visual A/B test editor, Server-side experimentation, Anti-flicker engine, AI personalisation. Both handle Feature flags.

Software Development · head to head

Flagsmith vs Kameleoon

Flagsmith

Software Development

Open-source feature flag and remote config platform

From: Free
Rated: -

Full review Website

Kameleoon

Testing

A/B testing and feature experimentation with a hybrid client and server-side engine

From: On request
Rated: -

Full review Website

The short version

Only Flagsmith has a free tier, so it costs nothing to try first.
Each has a real cost: Flagsmith the Free plan supports only a single team member, limiting collaboration for small teams.; 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.
They diverge on capability: Flagsmith covers Segments, Kameleoon covers Visual A/B test editor.
Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Flagsmith and Kameleoon actually diverge.

Attributes where Flagsmith and Kameleoon differ
Attribute	Flagsmith	Kameleoon
Starting price	Free	On request
Pricing model	freemium	quote
Free tier	Yes	No
Platforms	web, api	Web, iOS, Android
Category	Software Development	Testing

Identical on both: user rating (Not yet rated).

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 Flagsmith

Segments
A/B testing
Scheduled flags
SDKs
SAML/SSO

Only in Kameleoon

Visual A/B test editor
Server-side experimentation
Anti-flicker engine
AI personalisation
EU data hosting
Shared audiences
Statistics options

Both cover

Feature flags

What people use each for

The jobs each tool is most often brought in to do.

Flagsmith

Gradual feature rollouts across environmentsnot Kameleoon
Remote configuration without redeploying codenot Kameleoon
Running A/B tests tied to feature flagsnot Kameleoon
Self-hosting feature flags for data residency requirementsnot Kameleoon

Kameleoon

A European retailer whose legal team requires EU-hosted experimentation data and has ruled out US-only vendorsnot Flagsmith
A team running both marketing page tests and product feature rollouts that wants one results engine rather than two disagreeing onesnot Flagsmith
A media site where client-side flicker on a test variant is visibly damaging the reading experiencenot Flagsmith
An organisation re-tendering experimentation after Optimizely or VWO pricing changes and wanting an independent European vendornot Flagsmith

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Flagsmith

The Free plan supports only a single team member, limiting collaboration for small teams.
Exceeding request limits triggers overage charges after a one-time 30-day grace period.
Enterprise-grade SSO and governance are locked behind the Scale-Up and Enterprise tiers.
Self-hosting requires operating and updating the platform yourself, unlike a fully managed SaaS competitor.

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.

Pricing, plan by plan

Flagsmith

Free

FreeFree
- Up to 50,000 requests/month
- 1 team member
- Unlimited feature flags, environments, identities and segments
Start-Up$45/month
- Up to 1,000,000 requests/month
- 3 team members
- Scheduled flags, 2FA, A/B testing, integrations, email support
Scale-Up$300/month
- 5,000,000+ requests/month
- 5-20 team members
- SAML/SSO, governance features, priority support

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

Which should you pick?

Choose Flagsmith if

You need segments.
You want to start without paying.
You work on web, api.
You also want a/b testing.

Flagsmith review

Choose Kameleoon if

You need visual a/b test editor.
You work on Web, iOS, Android.
You also want server-side experimentation.

Kameleoon review

Questions people ask

Is Flagsmith or Kameleoon better?: Neither clearly leads. Flagsmith starts at Free and Kameleoon at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Flagsmith or Kameleoon?: Flagsmith has a free tier; the other does not. Paid plans start at Free for Flagsmith and On request for Kameleoon.
Does Flagsmith or Kameleoon run on more platforms?: Flagsmith runs on web, api. Kameleoon runs on Web, iOS, Android.
Can I use Flagsmith for free?: Yes. Flagsmith has a free tier, so you can try it without paying. Kameleoon starts at On request.
What is Flagsmith best used for?: Flagsmith is most often used for gradual feature rollouts across environments, remote configuration without redeploying code, running a/b tests tied to feature flags, self-hosting feature flags for data residency requirements. Of those, gradual feature rollouts across environments and remote configuration without redeploying code are not what Kameleoon is typically brought in for.
What can Flagsmith do that Kameleoon cannot?: Flagsmith covers Segments, A/B testing, Scheduled flags, SDKs. Kameleoon covers Visual A/B test editor, Server-side experimentation, Anti-flicker engine, AI personalisation. Both handle Feature flags.

Answered from the vendors’ own pages

Flagsmith: What does Flagsmith cost?

Flagsmith has a Free plan, a Start-Up plan from $40-45/month, a Scale-Up plan from $250-300/month, and custom Enterprise pricing.

Source

Kameleoon: Does Kameleoon publish pricing?

No. Pricing depends on monthly tested users and which capabilities you licence, and requires a sales conversation.

Flagsmith: Is there a free plan, and what are its limits?

The Free plan supports up to 50,000 requests per month and 1 team member, with unlimited feature flags, environments, identities and segments.

Source

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.

Flagsmith: How is usage metered?

Usage is metered by monthly API requests; exceeding a plan's limit triggers overage charges starting around $50 per million requests, with a 30-day grace period the first time a paid plan exceeds its limit.

Source

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.

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.

Flagsmith vs Kameleoon

Flagsmith

Kameleoon

The short version

Where they differ

What each one covers

Only in Flagsmith

Only in Kameleoon

Both cover

What people use each for

Flagsmith

Kameleoon

Where each one falls short

Flagsmith

Kameleoon

Pricing, plan by plan

Flagsmith

Kameleoon

Which should you pick?

Choose Flagsmith if

Choose Kameleoon if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on Flagsmith

More on Kameleoon

Keep looking

Other head to heads