Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.
Entry price
From $20 per user/month (indicative, cloud Pro)
Free tierFrom $80 per month (indicative, hosted Pro)
Free tierWhat drives the bill
The metric that actually scales your invoice.
Dramatically cheaper than the commercial platforms, especially self-hosted at high traffic.
Self-hosted open source is genuinely free; enterprise adds SSO, audit and change requests.
Free tier
Self-hosted open-source edition is free and unlimited; cloud free tier for up to a few users.
Open-source edition is free and self-hosted with no user limits.
Open source
MIT (core)
Apache-2.0 (core)
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Widely used
GrowthBook · since 2021
Widely used
Unleash / Bricks Software · since 2014
Strengths
Limitations
Best for
Data-mature teams that already have a warehouse and want to avoid volume-based pricing.
Privacy-sensitive or cost-sensitive teams that want flags without sending user data to a vendor.
All of these integrate with: Slack.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.