Unleash
Open-source feature management platform for enterprise teams
Founded
2019
Starting Price
$0
Category
Developer Tools
Last updated April 27, 2026
About Unleash
Unleash is an open-source feature flag management platform that gives development teams control over feature releases with targeted rollouts, kill switches, and A/B testing. With 30+ SDKs, an API-first architecture, and market-leading data governance, it supports both SaaS and self-hosted deployments for enterprises that need full control over their data.
Pros & Cons
Pros
- Fully open-source core with transparent development and active community
- Flexible deployment options — SaaS or self-hosted for full data sovereignty
- 30+ SDKs with API-first architecture for easy integration into any tech stack
- Intuitive UI that allows non-technical team members to manage feature flags
- Enterprise-grade data governance, security, and compliance controls
Key Features
Feature Flags
Create, manage, and organize feature flags across all environments, applications, and services with a centralized dashboard
Gradual Rollouts
Release features incrementally using canary releases and percentage-based rollouts to minimize risk
Kill Switches
Instantly disable faulty features in production without deploying new code
A/B Testing
Run feature experiments with variant flags to test different implementations against user segments
30+ SDKs
Native SDK support for all major programming languages and frameworks including JavaScript, Python, Java, Go, .NET, and more
Activation Strategies
Target specific user segments with built-in strategies like user IDs, IPs, hostnames, and custom constraints
Impact Metrics
Measure the impact of feature rollouts with built-in metrics tracking and governance controls
Pricing
Open Source
$0
- Feature flags
- Activation strategies
- API access
- Community support
- Self-hosted only
Best For
Safe Feature Releases
Gradually roll out new features to a small percentage of users before full release, with instant kill switches if issues arise
A/B Testing & Experimentation
Test different feature variants against user segments to make data-driven product decisions
Trunk-Based Development
Enable continuous deployment by hiding incomplete features behind flags, allowing teams to merge to main without feature branches
Enterprise Compliance
Maintain audit trails, enforce approval workflows, and control data residency with self-hosted deployments for regulated industries
Similar Tools
Featured In
#2
6 Best Feature Flag Tools for Progressive Rollouts (2026)
Best open-source feature flag platform for teams that need enterprise capabilities with data sovereignty — the strongest LaunchDarkly alternative at a fraction of the cost
#1
Best Feature Flag Tools With Percentage Rollouts & Targeting (2026)
Best overall for engineering teams who want production-grade rollouts and targeting without LaunchDarkly's bill or vendor lock-in.
