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Tools
Experimentation & feature flags
12 tools compared: how each is priced, where it runs, and what to consider instead.
| Tool | Pricing model | Free tier | Open source |
|---|---|---|---|
| AB Tasty French web experimentation and personalization platform defaulting to Bayesian reporting, now merged with VWO under the Wingify brand. | Quote only | No | No |
| Convert Experiences Privacy-focused web A/B testing platform that re-analyzes the same experiment under fixed-horizon frequentist, sequential frequentist or Bayesian statistics. | Subscription | No | No |
| Datadog Experiments (formerly Eppo) Warehouse-native experimentation platform known for its CUPED implementation, acquired by Datadog in 2025 and rebranded Datadog Experiments. | Quote only | No | No |
| Flagsmith Open-source (BSD-3-Clause) feature-flag and remote-config platform with basic A/B testing on flagged traffic, self-hostable or cloud. | Free tier + paid | Yes | Yes |
| GrowthBook Open-source, warehouse-native experimentation and feature-flag platform offering both Bayesian and frequentist sequential analysis with CUPED. | Free tier + paid | Yes | Yes |
| Harness Feature Management & Experimentation (formerly Split) Feature-flag platform with built-in statistical experimentation, acquired by Harness and sold as an Enterprise-plan module (Harness FME). | Quote only | No | No |
| Kameleoon Web experimentation and feature-management platform supporting frequentist, sequential, and Bayesian analysis side by side. | Quote only | No | No |
| LaunchDarkly Feature-flag management platform that also runs experiments on flagged rollouts, reading event data it collects itself rather than the warehouse. | Subscription | Yes | No |
| Optimizely One of the original A/B testing platforms, now the experimentation module of a broader digital-experience suite (CMS, commerce, personalization). | Quote only | No | No |
| Statsig Warehouse-native experimentation and feature-flag platform offering frequentist sequential testing, SPRT, Bayesian mode, and CUPED. | Free tier + paid | Yes | No |
| Unleash Open-source feature-flag platform with rollout-based experimentation, moved from Apache-2.0 to AGPLv3 licensing in mid-2026. | Free tier + paid | Yes | Yes |
| VWO Long-running web experimentation and personalization platform, using a Bayesian stats engine, now merging with AB Tasty under the Wingify brand. | Quote only | No | No |