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GO Feature Flag

gofeatureflag.org

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Spec score 7.8 #17 of 27 in Feature Flag Software

What it is

GO Feature Flag is an open-source feature-flag management system built on OpenFeature for infrastructure you control. Its relay proxy runs locally with Docker and a flag configuration file. Teams can target users and segments, use percentage or progressive rollouts, schedule changes, and run A/B tests. Client and server SDKs are listed for 16 languages and frameworks, including JavaScript, TypeScript, React, Swift, Kotlin, Go, Java, Python,.NET, Ruby, Rust, and others. Retrievers load configuration from HTTP(S), local files, Kubernetes ConfigMaps, cloud storage, Git providers, MongoDB, Redis, and PostgreSQL. Exporters send evaluation data to Kafka, AWS S3, BigQuery, OpenTelemetry, webhooks, or logs. Notifications can reach Slack, Discord, Microsoft Teams, webhooks, or logs. The MIT-licensed Opensource plan costs nothing, billed forever, with all features, unlimited flags, and community support.

Spec sheet

Product
GO Feature Flag is an open-source feature flag management system built on OpenFeature and designed to run on infrastructure you already have.Read 7 Oct 2026 · gofeatureflag.org
Audience
The maker describes the product as a feature management solution for teams seeking self-hosting, OpenFeature compatibility, and feature releases decoupled from deployments.Read 7 Oct 2026 · gofeatureflag.org
Deployment
The relay proxy can be started locally with a Docker command and uses a flag configuration file.Read 7 Oct 2026 · gofeatureflag.org
Support
Community support is included with the free plan; paid enterprise support includes premium support and an SLA on CVE fixes.Read 7 Oct 2026 · gofeatureflag.org
License
The project is 100% open source under the MIT license, and the site says the license permits commercial use.Read 7 Oct 2026 · gofeatureflag.org
Configuration integrations
Built-in retrievers load flag configuration from HTTP(S), local files, Kubernetes ConfigMaps, cloud storage, Git providers, MongoDB, Redis, and PostgreSQL.Read 7 Oct 2026 · gofeatureflag.org
Data control
The maker says the product is self-hosted and that flag evaluation and usage data stay in the customer's environment.Read 7 Oct 2026 · gofeatureflag.org
Data integrations
Exporters can send evaluation data to destinations including Kafka, AWS S3, Google Cloud BigQuery, OpenTelemetry, webhooks, and application logs.Read 7 Oct 2026 · gofeatureflag.org
Extensibility
Custom retrievers, exporters, and notifiers can be implemented through Go interfaces.Read 7 Oct 2026 · gofeatureflag.org
Flag management
The product supports targeting users and segments, percentage and progressive rollouts, scheduled changes, and A/B testing.Read 7 Oct 2026 · gofeatureflag.org
Notifications
The product can notify teams about flag configuration changes through Slack, Discord, Microsoft Teams, webhooks, or application logs.Read 7 Oct 2026 · gofeatureflag.org
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.Read 7 Oct 2026 · gofeatureflag.org

Plans and prices

Opensource Free forever All features · own infrastructure · unlimited feature flags · community support only Read 7 Oct 2026 · gofeatureflag.org
Enterprise Priced on request Premium support · SLA on CVE fixes · direct maintainer communication · integration help · roadmap preview · team training Read 7 Oct 2026 · gofeatureflag.org

Every GO Feature Flag plan and price →

Strong points and limits

Strong points

  • MIT-licensed open source
  • Self-hosted data control
  • Percentage and progressive rollouts
  • SDKs for 16 languages and frameworks
  • Unlimited flags on free plan

Limits

  • Free plan provides community support only
  • Requires customer-managed infrastructure

Who it suits

It suits teams wanting self-hosted feature management, OpenFeature compatibility, and releases separated from deployments. The free plan is intended for teams managing their own infrastructure.

Verdict

GO Feature Flag provides extensive rollout controls, integrations, and SDK coverage while keeping evaluation data in your environment. Its free plan includes the full feature set, while enterprise support adds paid services.

Where Specifiction places it

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