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Unleash

Feature flag platform enabling safe, incremental releases

Feature Flags

Unleash lets teams control feature rollouts, run canary releases, and test in production with an API‑first system and 15+ official SDKs, all self‑hostable via Docker.

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Overview

Overview

Unleash is a feature‑flag system designed for development teams that need precise control over how new functionality reaches users. By decoupling deployment from release, it lets engineers ship code continuously while safely toggling features on or off, performing canary rollouts, and conducting A/B tests without additional deployments.

Getting Started & Deployment

You can spin up a local instance in minutes using Docker Compose, then connect any of the 15+ official SDKs (Go, Java, Node.js, PHP, Python, Ruby, etc.) to start toggling flags. For production, Unleash can be self‑hosted on any server or cloud provider, with optional Edge scaling for high‑traffic front‑ends. Enterprises can also evaluate the hosted Unleash Enterprise trial, which adds RBAC, SSO, and advanced segmentation.

Highlights

API‑first flag management with full automation
15+ official SDKs covering major languages
Granular activation strategies (canary, kill‑switch, A/B testing)
Flexible deployment: Docker, self‑hosted or cloud Edge scaling

Pros

  • Fine‑grained control over releases reduces risk
  • Language‑agnostic SDK ecosystem simplifies integration
  • Self‑hosted option respects data residency and compliance
  • Enterprise add‑ons provide RBAC, SSO, and advanced segmentation

Considerations

  • Open‑source version requires own infrastructure to run
  • Advanced features like RBAC and SSO are locked behind Enterprise
  • Initial setup and strategy configuration can be complex
  • No built‑in analytics dashboard in the core product

Managed products teams compare with

When teams consider Unleash, these hosted platforms usually appear on the same shortlist.

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Hypertune

Type-safe feature flags platform with A/B testing, analytics, and app configuration optimized for TypeScript

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LaunchDarkly

Feature flag management platform for safe software releases with targeting, experimentation, and rollback capabilities

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Reflag

Feature flags and A/B testing for TypeScript

Looking for a hosted option? These are the services engineering teams benchmark against before choosing open source.

Fit guide

Great for

  • Teams practicing continuous delivery and feature toggling
  • Organizations needing GDPR‑compliant, privacy‑first flagging
  • Developers who want a single platform for multiple languages
  • Companies preferring self‑hosted solutions for control and cost

Not ideal when

  • Very small projects that don’t need feature flag management
  • Teams without ops resources to maintain self‑hosted services
  • Users requiring out‑of‑the‑box analytics without extra tooling
  • Projects that need built‑in A/B testing UI unless using Enterprise

How teams use it

Canary release of a new UI

Expose the UI to a small user segment, monitor performance, and roll back instantly if issues arise.

Beta feature toggle for power users

Enable experimental functionality only for selected users without redeploying the application.

Instant kill‑switch for a faulty feature

Disable a problematic flag across all environments in seconds, preventing user impact.

A/B testing of pricing page

Serve two variants to different user groups and collect conversion data via webhook integrations.

Tech snapshot

TypeScript92%
MDX5%
JavaScript3%
Mustache1%
CSS1%
SCSS1%

Tags

continuous-deploymentdevtoolfeature-toggleactivation-strategieshacktoberfestintegrationunleashfeature-togglesfeaturecollaborationsdkplatform-engineeringdevopsvariantsfeature-togglingtogglescontinuous-deliveryfeature-flagsexperiments

Frequently asked questions

Which programming languages are supported?

Unleash offers official SDKs for Go, Java, Node.js, PHP, Python, and Ruby, plus numerous community SDKs for other languages.

How can I try Unleash locally?

Clone the repository, run `docker compose up -d`, then open `localhost:4242` and log in with the default admin credentials.

Is there a hosted version of Unleash?

Yes, Unleash Enterprise provides a hosted trial and cloud instances with the full feature set.

Can I self‑host Unleash in production?

Absolutely. Deploy the Docker image or run the Node.js application on any server, with guides for Heroku, DigitalOcean, and more.

What security measures does Unleash include?

The platform follows privacy‑by‑design principles, offers audit logs, enforces strict HTTPS‑only mode, and Enterprise adds RBAC, SSO, and SCIM.

Project at a glance

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LicenseApache-2.0
Repo age11 years old
Last commit3 hours ago
Primary languageTypeScript

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