Aviationstack ◆
Aviationstack is a scalable REST API for real-time flight tracking, historical flight data, airport info, and global aviation data.

Unleash (Developer Tools): Unleash is a feature management platform for enterprises, offering feature flags, kill switches, and auditability to control code. Pricing: from $75/seat/month. (data verified August 2026)
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Unleash is a feature management platform designed for large enterprises. It provides feature flags, kill switches, and audit logs, giving teams control over code written by humans or AI. With Unleash, you can decouple deployments from releases, enabling gradual feature delivery and reducing the blast radius of software releases.
Traditional software releases are often big-bang events—stressful, risky, and slow. Unleash solves this by allowing teams to release features gradually, target specific users, and instantly roll back if something goes wrong. It also helps manage technical debt by tracking stale flags and improving release governance.
Unleash is built for engineering and product teams at global enterprises like Visa, Lloyds Banking Group, Samsung Ads, and Wayfair. It is ideal for organizations that need enterprise-grade security, compliance (SOC2, GDPR), and scalability. It is not for small projects or startups looking for a basic free tool without enterprise features.
Unleash is used for A/B testing, canary releases, feature toggles, and AI-generated code safety. It also enables teams to release over 100 times a day, as seen at Mercadona Tech, and to maintain compliance in regulated industries like finance and insurance.
Editorial score from our review methodology — not user ratings.
Unleash pricing: from $75/seat/month.
$75/seat/month (billed via credit card, 5 seat minimum for self-hosted). Includes 14-day free trial, no credit card required, unlimited feature flags, 90-day metrics, standard support, 99.9% uptime.
Annual contract, guided onboarding. Contact sales for quote. Includes unlimited everything, premium support, dedicated CS manager, 99.99% uptime, and add-ons like hosted private instance and multi-region Enterprise Edge.
All plans include a 14-day free trial. Open-source version available on GitHub.