Hypertune is the most flexible platform for feature flags, A/B testing, analytics and app configuration.

• Static typing and code generation gives you full end-to-end type-safety across all your feature flags and inputs.
• Install 1 TypeScript SDK optimized for all JavaScript environments — browsers, servers, serverless, edge and mobile — with simple integrations for React and Next.js, compatible with Server Components and the App Router.
• Define type-safe, custom inputs like the current User, Organization, etc, and use them in feature flag rules to target exactly the users you want.
• Create variables like user segments that you can reuse across different feature flags, and instantly debug flags for each user.
• Git-style version history, diffs, branching and pull requests let you manage feature flags like you manage your code. Test and preview flag changes in isolated branches and safely approve them with pull requests. Avoid bad changes and see exactly what changed and when.
• A/B tests, percentage-based rollouts, multivariate tests and machine learning loops let you seamlessly rollout, test and optimize new features.
• Log analytics events with type-safe, custom payloads, and build flexible funnels and charts in the dashboard to measure the impact of every feature release.
• Local, synchronous, in-memory flag evaluation with zero network latency lets you safely access flags in any code path without affecting the end user experience.
• Static build-time snapshots of your feature flag logic let you use the SDK in local-only, offline mode and give you safe fallbacks in remote mode.
• Initialize the SDK with only the feature flags you need and partially evaluate flag logic on the edge for performance and security.

Hypertune scales beyond feature flags to powerful app configuration to let you manage:

• Permissions, access controls, billing logic, etc
• In-app copy, marketing content, etc
• Allowlists, redirect maps, timeouts, magic numbers, etc

RepDB is a one-time-purchase exercise dataset for developers building fitness and workout apps — not a subscription, not a rate-limited API. You download the data once and own it: JSON (and SQLite on the higher tier), WebP images, and full EN/DE/ES translations, with no per-request billing and no dependency on our servers staying up.

A free tier includes 400 exercises with flat-style 512×512 images, attribution-licensed for commercial in-app use. The Starter tier ($199) adds the full catalog in classic white-background style. Standard ($399) adds transparent 1024px images, looping animations, exercise relations (similar/progressions/regressions), workout templates, and embeddings — exclusive to that tier.

Every exercise includes muscle-group highlighting, equipment/muscle icons, MET values, and safety/goal tags. Compared to GIF- or JPG-based competitor APIs, RepDB images are transparent WebP with no watermarks, so they drop into any app UI without a white box around them.