FitStar
FitStar Labs, Inc. was a San Francisco based consumer fitness company that built FitStar Personal Trainer and FitStar Yoga, adaptive video workout apps that adjusted each session to the user's feedback and fitness level. Backed by GV (Google Ventures) and Trinity Ventures, FitStar was acquired by Fitbit on March 5, 2015 for $17.8 million and folded into the Fitbit Coach product line. The company is DEFUNCT: the fitstar.com domain no longer serves web content (last archived live October 2017), the FitStar apps have been retired, and no developer portal, documentation, or public API surface survives. This profile is retained as a historical record in the API Evangelist network; there is nothing to enrich beyond identity and domain posture.
Index entry only — little beyond a description and a link, and nothing machine-readable enough for an agent to act on without a human reading the site first.
API Evangelist profiles FitStar the way a machine reads it — 1 machine-readable artifact, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — FitStar scores 7.4/100 (minimal), with a separate agent-readiness read of 0/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile FitStar
Each block below is one kind of artifact we hold for FitStar. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
Security Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for FitStar — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 1
Authentication, authorization, and security posture
← All providers · Data indexed from github.com/api-evangelist/fitstar · machine-readable index on apis.io