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Home/Categories/DevOps & CI/CD/Flagsmith
icon of Flagsmith

Flagsmith

Open source alternative to LaunchDarkly, Split and Statsig

  • 6.6K stars
  • BSD-3-Clause
  • Active this week
  • Last commit 1 day ago

Last verified Oct 20, 2026

Manage open-source feature flagging and remote config for safer releases, targeted rollouts, and self-hosted control. BSD-3-Clause licensed with SDK support.

Visit websiteGitHub6.6K stars1-click deploy on Hostinger
image of Flagsmith
TL;DR

Flagsmith is a BSD-3-Clause feature flag and remote configuration tool for engineering teams that want controlled rollouts, segmentation, and self-hosting. It helps teams release code gradually, target users, and change application behavior without redeploying. Best for teams that want a LaunchDarkly alternative with source access and deployment control.

Read the full breakdownHide the full breakdownWho it is for, how it works, trade-offs and the FAQ
who it's for

Who Flagsmith is for#

Engineering teams practicing progressive delivery

Flagsmith helps teams release features gradually, target cohorts, and turn off risky changes without redeploying.

Skip if:

Choose a managed flag service if no one can operate a highly available flag backend.

Product teams managing remote configuration

Teams can adjust application behavior for environments, segments, or customer groups through remote config.

Skip if:

Skip it if you need deep experimentation statistics and warehouse-native metric analysis as the main requirement.

the problem

The problem it solves#

Shipping every feature as an all-or-nothing release increases risk. Without feature flags, teams need emergency rollbacks, branch gymnastics, or redeploys just to disable a broken feature for one segment.

Managed flag services solve rollout control, but they can become expensive and central to production availability. Teams that want cost and data control may prefer a self-hosted flag service.

how Flagsmith solves it

How it solves it#

Feature flags and remote config

Flagsmith supports flag-controlled releases and remote configuration, letting teams change behavior without deploying new code.

Segmentation and targeting

Teams can target users or segments for gradual rollouts, experiments, or environment-specific behavior.

Self-hosted flag service

Flagsmith describes on-premise and private cloud hosting, giving teams control over flag infrastructure and data paths.

BSD-3-Clause license

The GitHub repository reports BSD-3-Clause licensing for the API repository.

strengths · trade-offs

Strengths and trade-offs#

Strengths

  • Reduces release riskFlags let teams ship code separately from releasing features, which makes staged rollouts and quick disables easier.
  • Open alternative to managed flag vendorsTeams can inspect and self-host the core service instead of putting production feature control entirely behind a proprietary vendor.
  • Useful for product and engineering alignmentRemote config and targeting let product teams control exposure while engineering keeps deployment cadence steady.

Trade-offs

  • -Flag service reliability becomes production-criticalIf apps depend on remote flag decisions, the Flagsmith deployment needs high availability, caching strategy, monitoring, and incident planning.
  • -Experiment analytics may need pairingFlagsmith handles rollout and config, but teams should verify whether its analytics depth matches dedicated experimentation tools for their use case.
versus alternatives

Flagsmith vs alternatives#

Flagsmith vs LaunchDarkly

Flagsmith and LaunchDarkly both help teams manage feature flags and remote configuration. Flagsmith gives teams an open-source and self-hostable path; LaunchDarkly offers a mature proprietary managed service with enterprise support.

Flagsmith is the better fit when source access, self-hosting, and cost control matter most. LaunchDarkly is still the better choice when the company wants a vendor-managed flag service, enterprise reliability, and broad commercial support.

tech stack · detected from GitHub

What it's built on#

Languages
JavaScriptPythonTypeScript
Frameworks
DjangoExpressReact
Databases
PostgreSQL
Infrastructure
AWSDocker
Tooling
Webpack
frequently asked

FAQ#

What does Flagsmith do?

Flagsmith provides feature flags and remote configuration so teams can control rollouts and target application behavior.

Can Flagsmith be self-hosted?

Yes. Flagsmith describes on-premise and private cloud hosting and positions the project as an open-source alternative to managed feature flag vendors.

What license does Flagsmith use?

The Flagsmith API repository reports BSD-3-Clause licensing.

also worth a look

Similar open-source tools#

OpenFlags

Alternative toLaunchDarkly

Self-hosted feature flags for React, Bun, and Node.js

  • 15 GitHub stars
  • MITLicence MIT

Flipt

Alternative toLaunchDarkly

Feature flags that store and evaluate on your own infrastructure

  • 4,923 GitHub stars
  • MITLicence MIT

GrowthBook

Alternative toLaunchDarkly

Open source A/B testing and feature flag platform

  • 8,514 GitHub stars

Unleash

Alternative toLaunchDarkly

LaunchDarkly alternative with SDK for 30+ languages, self-hosted

  • 13,887 GitHub stars
  • AGPL-3.0Licence AGPL-3.0

Forgejo

Alternative toGitHub

Self-hosted Git forge for teams that want platform independence

  • 5,688 GitHub stars
  • GPL-3.0Licence GPL-3.0

OneDev

Alternative toGitHub

Git, CI/CD, issue tracking, wikis, and AI agents on your own server.

  • 15,318 GitHub stars
  • MITLicence MIT
by category

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Hostinger

Run Flagsmith on your own server

Hostinger sets Flagsmith up as a one-click app on a VPS.

Deploy on Hostinger

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