Flagsmith vs Kameleoon

From $40 per month (Start-Up, billed yearly; $45 monthly)

From $495 per month (PBX Starter: 10 experiments, 50k tested visitors)

Free covers 50k requests a month and one seat; Start-Up raises that to 1M requests and 3 seats, Scale-Up is $250/month yearly. Considerably cheaper than LaunchDarkly, and self-hosting removes usage pricing entirely.

Kameleoon now publishes an entry price. Above Starter it is priced by traffic and modules on a custom quote.

Free cloud tier with a monthly request allowance; open-source self-hosting is unlimited.

30-day trial, no card, up to 3 experiments.

Established

Flagsmith · since 2018

Established

Kameleoon · since 2012

• Genuinely easy self-hosting with a Docker image and Helm chart.
• Simple, comprehensible pricing.
• Remote config alongside flags, which covers a lot of mobile use cases.

• Genuinely good hybrid model — the same experiment can run client- and server-side.
• Effective anti-flicker implementation.
• EU hosting with healthcare-grade compliance options.

• Experimentation features are basic.
• Smaller company and community than the leaders.
• Fewer governance controls for large organisations.

• Smaller market presence outside Europe.
• Only the entry tier is priced publicly; everything above it is a sales conversation.
• Fewer third-party integrations than Optimizely.

Teams wanting straightforward flags without LaunchDarkly pricing or Unleash's operational depth.

European enterprises needing both marketer and developer experimentation under GDPR.