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Flagsmith

Open-source flags, remote config, and OpenFeature providers

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Our verdict

#2 of 4 in Self-hosted feature flags · For a BSD-licensed server

Pros

  • BSD-3-Clause on most of the platform, MIT on a few repositories
  • The README calls the open-source self-host free
  • Percentage splits are documented for A/B/n tests

Cons

  • PostgreSQL is in the published compose file
  • The README's SDK count is 15 or more, not a published list of 20
  • SAML, workflows, and LDAP are on the Enterprise image

Who should skip:Anyone who needs those Enterprise controls on the free build.

Read the full review →

Rankings and alternatives

Self-hosted feature flags scores

Evaluated Nov 8, 2026 Evidence ↓
  • Setup 3

    3/5 means: A container plus one database server

    Docker Compose is the documented self-host path, and the compose file points the app at PostgreSQL.

  • Free self-hosted edition 4

    4/5 means: The open-source build is described as free, while a separate hosted free plan is capped

    The README calls the open-source self-hosted build free, and a separate Enterprise edition. The pricing page describes a hosted free plan and an overage rate. It does not say those hosted caps apply to the open-source build.

  • Experiments 4

    4/5 means: Percentage or multivariate tests the project calls A/B tests

    The homepage documents multivariate flags with a percentage split and calls that A/B/n testing.

  • SDKs 4

    4/5 means: A large SDK list, or OpenFeature plus several languages. Conflicting counts on the project's own pages keep this from a 5

    The README says 15+ languages, which is the project's own count, and documents OpenFeature providers. The count is not repeated as 20 or more.

  • Server license 5

    5/5 means: BSD or MIT for the server, with no commercial directory called out

    The README says most of the platform is BSD-3-Clause, with some repositories under MIT. Enterprise governance features need a separate license, which is a paid edition rather than a non-permissive server license.

Pricing

  • Open source, self-hosted Free The README calls the open-source self-hosted build free. Hosted plan prices are not stated as a monthly fee on the pricing page we saved.

From the vendor’s pricing page, checked Nov 8, 2026. That page is authoritative.

Evidence and sources

Self-hosted feature flags scores

Setup 2 quotes
Free self-hosted edition 2 quotes
  • “self-hosted (available as our free open-source build or a fully supported Enterprise edition)”
    github.com/Flagsmith/flagsmith · checked
  • “If you're on a free plan, you'll have 7 days to upgrade your plan before any action is taken. For paid plans that exceed your API limit (within 200%) for the first time, you'll have a 30-day grace period and you won't be charged. If you continue to exceed your plan after 30 days, you’ll be billed for overages per specified rates: Start-Up: $7/100k requests and enterprise: rate specified in your contract.”
    flagsmith.com/pricing · checked
Experiments 1 quote
  • “Multivariate flags allow you to use a percentage split across two or more variations for precise A/B/n testing and experimentation.”
    flagsmith.com · checked
SDKs 2 quotes
  • “Prefer the vendor-neutral route? You can use Flagsmith through OpenFeature with providers for the following languages:”
    github.com/Flagsmith/flagsmith · checked
  • “SDKs and frameworks: Choose from 15+ popular languages like TypeScript, .NET, Java, and more.”
    github.com/Flagsmith/flagsmith · checked
Server license 2 quotes
  • “The majority of our platform is open source under the BSD-3-Clause license. A small number of repositories are under the MIT license.”
    github.com/Flagsmith/flagsmith · checked
  • “Enterprise-level governance and management features are available with a valid Flagsmith Enterprise license.”
    github.com/Flagsmith/flagsmith · checked

Facts

License 1 quote
  • “The majority of our platform is open source under the BSD-3-Clause license. A small number of repositories are under the MIT license.”
    github.com/Flagsmith/flagsmith · checked
Runs on 1 quote
Needs 1 quote

Other quotes

Not cited by a score or fact 1 quote

Pricing

github.com/Flagsmith/flagsmith · checked