GO Feature Flag
Open-source feature flag system built on the OpenFeature standard.
GO Feature Flag is an open-source, self-hosted feature flag management system that decouples code deployment from feature release. It solves the problem of needing to redeploy an application to turn a feature on or off, allowing teams to ship code safely and manage releases independently. The system stores flag configuration in a file, such as YAML, which is read and polled by a relay proxy, eliminating the need for a dedicated database.
Its main capabilities include progressive rollouts, A/B testing, kill switches, and targeted releases based on user attributes or segments. The product is built on the OpenFeature standard and provides SDKs for a wide range of languages and frameworks, including JavaScript, TypeScript, React, Angular, Swift, Kotlin, Go, Java, .NET, Python, Node.js, PHP, Ruby, and Rust. It integrates with external systems through three pluggable extension points: retrievers to fetch configuration from sources like S3, GitHub, or Kubernetes; exporters to stream evaluation data to data stacks like Kafka or BigQuery; and notifiers to alert teams via Slack, Discord, or webhooks when flags change.
GO Feature Flag is designed for engineering teams that want to own their infrastructure and avoid vendor lock-in or per-seat pricing. It is MIT-licensed and free to use, with no paid tiers or usage limits. The product is self-hosted, meaning teams run the relay proxy on their own infrastructure, and there is no mention of a free plan or trial on the provided pages.
12 alternatives to GO Feature Flag
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