FitStar website screenshot

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.

FitStar is profiled on the APIs.io network. Tagged areas include Company, Defunct, Acquired, Fitness, and Health and Wellness.

🌐 Visit website 📡 Source on GitHub
7.4/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs
CompanyDefunctAcquiredFitnessHealth and WellnessConsumer ApplicationsMobile ApplicationsPersonal Training

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 7.4/100 · minimal
Contract Quality 0.0 / 25
Developer Ergonomics 0.0 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 0/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/fitstar: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Fitstar Domain Security

DMARC

SECURITY

Resources

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Source (apis.yml)

apis.yml Raw ↑ 
aid: fitstar
name: FitStar
description: '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.'
url: https://raw.githubusercontent.com/api-evangelist/fitstar/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://avatars.githubusercontent.com/u/1479331?v=4
x-type: company
x-source: vc-portfolio
x-status: defunct
x-defunct-reason: acquired
x-acquired-by: fitbit
x-acquired-date: '2015-03-05'
x-acquired-amount-usd: 17800000
x-backed-by:
- gv
- trinity-ventures
x-tier: stub
x-tier-reason: defunct-no-api-surface
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Defunct
- Acquired
- Fitness
- Health and Wellness
- Consumer Applications
- Mobile Applications
- Personal Training
apis: []
common:
- type: GitHubOrganization
  name: FitStar Labs, Inc. on GitHub
  url: https://github.com/fitstar
- type: DomainSecurity
  name: Domain security posture
  url: security/fitstar-domain-security.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: minimal
  artifacts_added: 1
  pass: local-v1