A/B Testing, Personalization & Feature Flags

Flagsmith

BSD-3-Clause-licensed feature flag platform, published by Bullet Train Ltd.

Adoption1 site

Ranked 23 of 24 in A/B Testing, Personalization & Feature Flags0.2% of the 486 tracked sites using A/B Testing, Personalization & Feature Flags

Pricing: open-source

About Flagsmith

Remote config values and experiments run on the same platform as the feature flags. Hosting is a choice between Flagsmith's cloud and a self-hosted install, which can run on-premises or inside a team's own cloud account.

Sources: Flagsmith on GitHub, Flagsmith · Checked 17 Oct 2026

Websites using Flagsmith

techstars.com

Who added or dropped it

No switches yet. We rescan every site monthly, and any site that adds or drops Flagsmith shows up here.

Often used with

Amazon CloudFront100%
Amazon Registrar (Route 53 Domains)100%
Amazon Route 53100%
Amazon SES100%

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