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GO Feature Flag
What it is
GO Feature Flag is an open-source feature flag management system built on OpenFeature and designed to run on infrastructure a team controls. A relay proxy can be started locally with Docker and a flag configuration file. Teams can target users and segments, use percentage and progressive rollouts, schedule changes, and run A/B tests. Client and server SDKs cover 16 languages and frameworks, including JavaScript, React, Swift, Kotlin, Go, Java, Python, .NET, Ruby, and Rust. Built-in retrievers load configuration from sources such as HTTP(S), local files, Kubernetes ConfigMaps, cloud storage, Git providers, MongoDB, Redis, and PostgreSQL. Exporters can send evaluation data to Kafka, AWS S3, Google Cloud BigQuery, OpenTelemetry, webhooks, and application logs. Teams can receive configuration-change notices through Slack, Discord, Microsoft Teams, webhooks, or logs. Go interfaces support custom retrievers, exporters, and notifiers. The project is MIT-licensed and the site says commercial use is permitted. The maker says evaluation and usage data stay in the customer’s environment. Its free Opensource plan includes all features and unlimited flags, with community support.
For and against
For
- MIT license permits commercial use
- Free plan includes all features and unlimited flags
- Supports scheduled changes and progressive rollouts
- Evaluation and usage data stay in the customer’s environment
Against
- Free plan includes community support only
- Running the relay proxy requires infrastructure
The verdict
GO Feature Flag offers broad flag management and integration options for teams running the system on their own infrastructure. The free plan has no listed feature restrictions, while premium support and an SLA on CVE fixes are part of the Enterprise offering.
Who it suits
GO Feature Flag is for teams seeking self-hosted feature management, OpenFeature compatibility, and releases decoupled from deployments. It suits teams that can use community support or are prepared to consider enterprise support options.
Plans and prices
Opensource
All features · own infrastructure · unlimited feature flags · community support only
Read 7 Oct 2026 · gofeatureflag.org
Enterprise
Premium support · SLA on CVE fixes · direct maintainer communication · integration help
Read 7 Oct 2026 · gofeatureflag.org
On the record
- Audience
- The maker describes the product as a feature management solution for teams seeking self-hosting, OpenFeature compatibility, and feature releases decoupled from deployments.gofeatureflag.org · read 7 Oct 2026
- Configuration integrations
- Built-in retrievers load flag configuration from HTTP(S), local files, Kubernetes ConfigMaps, cloud storage, Git providers, MongoDB, Redis, and PostgreSQL.gofeatureflag.org · read 7 Oct 2026
- Data control
- The maker says the product is self-hosted and that flag evaluation and usage data stay in the customer's environment.gofeatureflag.org · read 7 Oct 2026
- Data integrations
- Exporters can send evaluation data to destinations including Kafka, AWS S3, Google Cloud BigQuery, OpenTelemetry, webhooks, and application logs.gofeatureflag.org · read 7 Oct 2026
- Deployment
- The relay proxy can be started locally with a Docker command and uses a flag configuration file.gofeatureflag.org · read 7 Oct 2026
- Extensibility
- Custom retrievers, exporters, and notifiers can be implemented through Go interfaces.gofeatureflag.org · read 7 Oct 2026
- Flag management
- The product supports targeting users and segments, percentage and progressive rollouts, scheduled changes, and A/B testing.gofeatureflag.org · read 7 Oct 2026
- License
- The project is 100% open source under the MIT license, and the site says the license permits commercial use.gofeatureflag.org · read 7 Oct 2026
- Notifications
- The product can notify teams about flag configuration changes through Slack, Discord, Microsoft Teams, webhooks, or application logs.gofeatureflag.org · read 7 Oct 2026
- Product
- GO Feature Flag is an open-source feature flag management system built on OpenFeature and designed to run on infrastructure you already have.gofeatureflag.org · read 7 Oct 2026
- SDKs
- The site lists client and server SDKs for 16 languages and frameworks, including JavaScript, React, Swift, Kotlin, Go, Java, Python, .NET, Ruby, and Rust.gofeatureflag.org · read 7 Oct 2026
- Support
- Community support is included with the free plan; paid enterprise support includes premium support and an SLA on CVE fixes.gofeatureflag.org · read 7 Oct 2026
