GrowthBook vs Optimizely
Side-by-side from the Top 11 ranking of The 11 Best A/B Testing Tools (2026). Last verified June 13, 2026.
The short answer
Optimizely ranks higher on Top 11 (#1 vs #11) for Growth teams running experiments. The enterprise standard for its powerful stats engine and full-stack experimentation features.
At a glance
| GrowthBook | Optimizely | |
|---|---|---|
| Top 11 rank | #11 / The 11 Best A/B Testing Tools (2026) | #1 / The 11 Best A/B Testing Tools (2026) |
| Score (out of 9.4) | 7.4 | 9.2 |
| Best for | Open-source testing on your data warehouse | Enterprise-scale experimentation |
| Pricing | $ (Free to custom) | $$$$$ (Custom enterprise plans) |
| HQ | San Francisco, USA | New York, USA |
| Founded | 2020 | 2009 |
GrowthBook
An open-source tool that runs on your data warehouse, giving you full data ownership.
www.growthbook.ioOptimizely
The enterprise standard for its powerful stats engine and full-stack experimentation features.
www.optimizely.comMethodology and scoring weights live at /methodology. No vendor pays for placement — see about.