# Fleack

## Docs

- [Fleack changelog — release history and what's new](https://docs.fleack.io/changelog.md): The full release history for Fleack — every feature shipped, known limits at each version, upcoming roadmap items, and how Fleack is versioned.
- [Endpoints: How Fleack Classifies Your API Traffic](https://docs.fleack.io/core-concepts/endpoints.md): Understand how Fleack groups and classifies the API calls your app makes, and why only config-candidate endpoints can carry A/B tests.
- [Levers: Declaring Testable Parameters in Your API](https://docs.fleack.io/core-concepts/levers.md): Learn what levers are in Fleack, how AI and heuristics detect them automatically, and how to create one manually using the New Lever wizard.
- [Fleack core concepts: endpoints, levers, tests, and more](https://docs.fleack.io/core-concepts/overview.md): Learn how Fleack's five primitives — endpoints, levers, tests, segments, and exposures — connect to power no-SDK A/B testing for your mobile app.
- [Results: Reading Bayesian Test Outcomes in Fleack](https://docs.fleack.io/core-concepts/results.md): Understand how Fleack measures conversion, retention, and revenue metrics, interprets win probability, and tells you when to promote a winner.
- [Segments: Targeting the Right Users for Each Test](https://docs.fleack.io/core-concepts/segments.md): Learn how to build audience filters in Fleack using built-in platform attributes and profile data drawn from your own user endpoints.
- [Tests: Running Experiments on Your App's API Responses](https://docs.fleack.io/core-concepts/tests.md): Understand how Fleack tests work, what they're made of, how variant assignment stays sticky, and how to promote a winning variant.
- [Configure DNS to route your app's traffic through Fleack](https://docs.fleack.io/integration/dns-setup.md): Add a CNAME record on your app's API hostname to activate Fleack, then verify the edge is receiving traffic before touching production.
- [Fleack's fail-open guarantee: your app always keeps running](https://docs.fleack.io/integration/fail-open.md): Understand the fail-open contract that ensures Fleack failures are invisible to your users, plus how to roll back instantly if you need to.
- [How Fleack intercepts your API traffic at the edge](https://docs.fleack.io/integration/how-it-works.md): Learn how a single CNAME routes your app's API calls through Fleack's edge, where test variants are injected and every request is logged.
- [Fleack: A/B testing for mobile apps without an SDK](https://docs.fleack.io/introduction.md): Fleack intercepts your app's API traffic at the edge so mobile growth teams can run A/B tests without an SDK, app rebuild, or store review cycle.
- [Get started with Fleack: from DNS setup to live test](https://docs.fleack.io/quickstart.md): Walk through DNS setup, traffic capture, lever creation, and launching your first Fleack A/B test — no SDK or app rebuild required.
- [A/B test interstitial ad frequency without SDK changes](https://docs.fleack.io/recipes/ab-test-interstitial-frequency.md): Test three interstitial ad frequencies on your mobile game and find the cadence that balances D7 revenue and retention in about 30 minutes.
- [A/B test an onboarding flow on mobile without rebuilding](https://docs.fleack.io/recipes/ab-test-onboarding-flow.md): Test the order, pacing, and reward timing of your first-session steps to lift D1 retention on new installs — no binary update, no SDK changes.
- [A/B test in-app pricing on mobile without store changes](https://docs.fleack.io/recipes/ab-test-pricing.md): Test IAP bundle composition — gems, skins, bonus content — for the same SKU price and find what drives first purchase and long-term ARPPU.
- [Troubleshoot Fleack: error codes and common issues](https://docs.fleack.io/troubleshooting.md): Every error Fleack returns, what it means for your app or team, and the exact steps to resolve it — including health check endpoints.