Open Saas Directory
Unleash

Unleash

★ 13,793894 forks894 contributorsUpdated 9/8/2026

Unleash is an open-source feature management platform, and a self-hosted alternative to LaunchDarkly. It controls feature flags through activation strategies — gradual rollouts, user targeting, A/B tests — with SDK evaluation happening locally for low latency and privacy. It includes environments, approval workflows, audit logs, and a metrics view of flag exposure.

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Overview

Description

Unleash is an open-source feature management platform, and a self-hosted alternative to LaunchDarkly. Feature flags are controlled by composable activation strategies — percentage rollouts, user or segment targeting, variants for A/B testing — and evaluated inside the application by SDKs, so no user data needs to leave your infrastructure. Environments, change requests, and audit logging support team workflows.

Features

  • Activation strategies: Gradual rollout, targeting by user/segment, host/IP, and custom context.
  • Local evaluation: SDKs evaluate flags in-process for speed and privacy; no per-request calls.
  • A/B testing: Flag variants with weighting, plus impression events for experimentation.
  • Environments & approvals: Per-environment configs with change-request review workflows.
  • Governance: Full audit log, RBAC, SSO/SAML, and API tokens.
  • SDK coverage: 15+ official server and client SDKs, plus Edge and Proxy for frontend apps.

Technology Stack

  • TypeScript / Node.js API server
  • React admin UI
  • PostgreSQL as the only datastore
  • Docker images and a Helm chart for deployment

Requirements

  • Docker and Docker Compose (or Kubernetes)
  • PostgreSQL 13+ database
  • ~1 GB RAM for the API server

Learning resources

Video

Getting Started: Introduction to Unleash Feature Flag Management

An overview of Unleash's architecture and core concepts — activation strategies, environments, and SDK-side evaluation — with a walkthrough of the admin UI.

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Article

Unleash Quickstart

The official quickstart: run the Unleash server with Docker, create a flag with an activation strategy, and connect an SDK to evaluate it.

By Unleash · Invalid Date