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GO Feature Flag

Open-source feature flags — built on OpenFeature.

The feature flag tool for the AI era: ship fast, roll out safely, roll back instantly. Set up in minutes with no infrastructure to manage — and it works with the stack you already use.

Get Started in 60 seconds
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100% OpenSource · MIT Licensed · Support 16 languages & frameworks

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Trusted in production by engineering teams at
Grafana Labs
Miro
Cast.ai
Lyft
Tencent
Minder
Agentero
Lands'end
Alternative Payments
mecena
HelloWorld CS
Stacklok
What is GO Feature Flag?

GO Feature Flag is an open-source, OpenFeature-native feature flag management system that runs on the infrastructure you already have - no database to operate, no vendor to lock into, and no per-seat bill.

Quick and Easy Setup

GO Feature Flag believes in simplicity and offers a simple and lightweight solution to use feature flags.

Our focus is to avoid any complex infrastructure work to use the solution.

Complete Feature Flag Solution

Target individual segments, users, and development environments, use advanced rollout functionality.

You can also collect usage data of your flags and be notified of configuration changes.

Developer Optimized

100% Opensource, no vendor locking, supports your favorite languages and is pushing for standardisation with the support of OpenFeature.

File based configuration, integrated with the tools that you already use.

Dive into GO Feature Flag
Up and running in 60 seconds

A Docker container, a YAML file, and two lines of SDK code.

flags.goff.yaml
# Roll out to 10% of users — increase anytime
my-new-feature:
  variations:
    enabled: true
    disabled: false
  defaultRule:
    percentage:
      enabled: 10
      disabled: 90

Change percentages, targeting rules, or add new flags — no redeploy needed.

Part of the OpenFeature Ecosystem

At GO Feature Flag, we believe in the power of open standards and, the importance of vendor neutrality. That's why we've chosen to rely on Open Feature for our SDKs.

By adopting GO Feature Flag you embrace the OpenFeature standard and you get all the benefits of the ecosystem.

  • Open-Source SDKs

  • No Vendor Lock-In

  • OpenFeature community based support for SDKs

openfeature-logo
Javascript
Typescript
React
Angular
Swift
Kotlin / Android
Golang
Java
Kotlin
.NET
Python
Node.JS
PHP
Ruby
Rust
NestJS

Supports your favorite languages

GO Feature Flag believe in OpenSource, and offer providers for the feature flag standard OpenFeature.
In combination with the Open Feature SDKs these providers will allow you to use GO Feature Flag with all supported languages.

See our SDKs

Integrates with different systems

GO Feature flag is cloud ready and can retrieve its configuration from various places, store your data usage where you want and notify you when something changes.

  • Retrieve your file from S3, Google Cloud, Github, Kubernetes, and more.

  • Store flags usage in your favorite dataset (S3, GCP, and many more ...)

  • Be notified on slack or via a webhook that your flag has changed.

  • You can also extend GO Feature Flag if needed.

See our integrations Retrievers|Exporters|Notifiers

HTTP(S)
File System
Kubernetes ConfigMap
AWS S3
Google Cloud Storage
Azure Blob Storage
GitHub
GitLab
Bitbucket
MongoDB
Redis
Postgresql
Apache Kafka
AWS Kinesis
Google Cloud PubSub
Google Cloud BigQuery
AWS SQS
Webhook
Log
OpenTelemetry
Slack
Discord
Microsoft Teams

Why GO Feature Flag?

Compare file-based open source against SaaS platforms, database-backed tools, and rolling your own.

GO Feature Flag

Open source · file-based

SaaS platforms

LaunchDarkly · Split ...

DB-backed OSS

Unleash · Flagsmith ...

DIY config

Roll your own solution

OpenFeature Support
Support only OpenFeature (no vendor lock-in)
limited support
limited support
Pricing
Free — MIT License
Per-seat / per-MAU
Free core, paid tiers
Free
Database required
None — flags are a file
Vendor-managed
PostgreSQL
None
Self-hosting
runs in your infra
vendor-hosted only
limited self-hosting options
Rollouts & targeting
you build it
A/B testing
Varies
Collect Usage data
via exporters
Partial / paid
you build it
Optimize Feature Launches with Advanced rollout capabilities.
From Progressive Rollouts to Sequential Releases.

Advanced rollout capabilities

Feature flags allow you to unlink deploy and release. This means you can decide how to release a feature without worrying about architecture and complex deployments.

These capabilities give you more control over your rollout changes and ensure that everything happens as expected.

  • Rules: Impact only the users you want to target.

  • Canary release: Enable the feature only to a subset of your users.

  • Progressive rollout: Affect from 0% to 100% of users within a time frame, you can monitor while releasing the change.

  • Scheduled Workflows: Modify your flag at a specific time to impact more/less users.

  • A/B testing: Split your audience in multiple groups and track their usage.

See our rollout capabilites

feature-image
How it works?

One relay-proxy on your infrastructure, your applications consume flags through OpenFeature SDKs, and your flag configuration lives in a file you already control.

Retrievers, notifiers, and exporters plug into the stack you are using.

GO Feature Flag architecture: OpenFeature SDKs talking to the relay-proxy, which loads flag configuration via retrievers and emits events via notifiers and exporters.

Want the full picture? Read the architecture documentation for a deeper dive into every component.

The Benefits of Feature Flags
Test in production
Test in production

Test directly in production with your real data by enabling the features to your QA. Decrease incident by disabling the feature as soon as a bug arise.

Give autonomy to stakeholders
Give autonomy to stakeholders

You don't need a software engineer to release a new feature, empower business stakeholders, no development skills are needed.

Innovate faster
Innovate faster

Deploy code when it is convenient (several times a day). Release when it is ready and it brings value. Deliver software to target audiences progressively.

Experiment and learn
Experiment and learn

Try new features and measure their success while running A/B test. Export who was using which variation and learn what is successful for your business.

Make engineers happy and productive
Make engineers happy and productive

Have a better developer experience with simplifying how to release, test and deploy your software.