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.

📡 Profile data on GitHub

0.0/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs

Company Defunct Acquired Fitness Health and Wellness Consumer Applications Mobile App Personal Training

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 0.0/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 0.0 / 9

Regulatory Posture 0.7 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Health regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/fitstar/apis.yml: open an issue on github.com/api-evangelist/fitstar to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Mobile SDK Publishers (Play SDK Index, CocoaPods, ADA certification)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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)

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
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  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: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Defunct
- Acquired
- Fitness
- Health and Wellness
- Consumer Applications
- Mobile App
- Personal Training
tags_raw:
- 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

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