The backend for fitness apps.

A fitness app needs workout/activity data, time-boxed challenges with real-time leaderboards, a social feed, streaks, push (“a friend just passed you”), and subscription handling. Amba provides leaderboards, challenges, streaks, social feeds, push, segments, and entitlements as one backend, so the competitive and social loops are installed rather than assembled.

An AI coding agent connects to Amba’s hosted MCP server, provisions a project, and wires the SDK without a single dashboard click. Fitness apps are equal parts data store, competition engine, and social network — workouts in, leaderboards and challenges out, with a feed and notifications keeping people coming back. Amba covers the engagement and social surfaces; you bring the workout logic. What is an agent-native backend?

Leaderboards & challenges

XP and metric-based leaderboards plus time-limited challenges with rewards, friend-scoped boards, and anti-cheat hooks.

Social feed

Friends/follows, groups, and an activity feed with fan-out, all wired to the same auth and analytics.

Streaks & push

Declarative workout streaks plus scheduled and triggered iOS/Android push targeted by segments.

Subscriptions

Entitlement checks like user.entitled("pro") readable from any tool, segment, or push trigger.

Collections

Typed data with optional vector search for storing workouts, routes, and program content.