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Best a/b testing, personalization & feature flags in 2026
Ranked by how many of the 3,229 websites we scan use each one right now.
- 1
PostHog Feature Flags & Experiments42 sites (1%), freemiumVisit ↗ - 2
VWO24 sites (0.7%), freemiumVisit ↗ - 3
Webflow Optimize (Intellimize)15 sites (0.5%), paidVisit ↗ - 4
Optimizely12 sites (0.4%), paidVisit ↗ - 5LaunchDarkly8 sites (0.2%), paidVisit ↗
- 6Adobe Target5 sites (0.2%), paidVisit ↗
- 7
Amplitude Experiment5 sites (0.2%), paidVisit ↗ - 8Convert Experiences5 sites (0.2%), paidVisit ↗
- 9
Statsig4 sites (0.1%), freemiumVisit ↗ - 10
Google Optimize3 sites (0.1%), freeVisit ↗ - 11
Unleash3 sites (0.1%), open-sourceVisit ↗ - 12
GrowthBook2 sites (0.1%), open-sourceVisit ↗ - 13
ConfigCat1 site (0.0%), freemiumVisit ↗ - 14
Eppo1 site (0.0%), paidVisit ↗ - 15
Kameleoon1 site (0.0%), paidVisit ↗ - 16
Mutiny1 site (0.0%), paidVisit ↗ - 17
Split (Harness Feature Management)1 site (0.0%), paidVisit ↗