Unleash

Open-source feature flag platform for managing feature rollouts and progressive delivery at scale.

📍 Norway 🇳🇴, Oslo

Product overview

Unleash is an open-source feature flag platform headquartered in Oslo, Norway. It originated as an internal tool built at FINN.no (Norway's largest online marketplace) in 2015 and was released publicly on GitHub before being incorporated as a company in 2019. It is the largest open-source feature flag solution, with over 18 million Docker downloads. Engineering teams use Unleash to manage feature rollouts, run gradual releases, set up kill switches, and control which users see which features through activation strategies. The platform supports percentage-based rollouts, user segmentation, and strategy variants for basic A/B testing. Its architecture keeps end-user data within the customer's own application, which simplifies compliance with GDPR and Schrems II requirements. Unleash follows an open-core model: the self-hosted open-source version covers core feature management, while the commercial Pro and Enterprise tiers add managed hosting, SSO, role-based access control, and change requests. The company raised $16.5 million in a Series A led by Spark Capital and counts organizations like Visa and Samsung among its customers. SDKs are available for over 30 platforms and languages. Integrations include Slack, Microsoft Teams, Datadog, and Jira. KEY FEATURES: - Feature flags with gradual rollout, kill switches, and activation strategies - Open-source core with self-hosted or managed deployment - Privacy-by-design architecture where no user data leaves the application - Over 30 official and community SDKs - Change requests, audit logs, and role-based access in Enterprise tier