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Flagsmith

Open source feature flag service for managing feature flags, remote config and A/B tests.

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Flagsmith is an open source feature flag platform that lets teams enable, disable and configure features across web, mobile and server-side applications without deploying code. Flags can be targeted by development environment, individual user, segment or percentage split, supporting canary deployments and A/B and multivariate testing. Remote config allows values such as interface elements to be changed in real time.

The platform includes SDKs for languages and frameworks including React, Next.js, Node, Python, Ruby, Go, .NET, PHP, Java, iOS, Android, Flutter and a REST API. Integrations cover analytics, observability and workflow tools such as Amplitude, Datadog, Grafana, Sentry, GitHub, Jira, Slack, Segment, Snowflake and Terraform, with WebHooks for custom events. Flagsmith can be used as an OpenFeature provider.

Flagsmith is aimed at development teams managing feature releases. It is available as a free plan, paid tiers with a 14-day trial, and an Enterprise edition, with limits on requests per month and team members. Deployment options include hosted cloud, private cloud and self-hosted installation.

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