Clue (BioWink)

Clue, operated by BioWink GmbH in Berlin, Germany, is a science-driven menstrual, ovulation, pregnancy, and reproductive health tracking app with 100M+ downloads across 190+ countries. The product portfolio spans Clue (free tier), Clue Plus (subscription), Clue Conceive, Clue Pregnancy, Clue Perimenopause, and a "Clue (No Period)" mode for non-bleeding hormonal cycles. Clue Connect provides partner sharing. The company contributes anonymized real-world data to academic research partnerships with Stanford, University of Oxford, UC Berkeley, MIT, and the Bill & Melinda Gates Foundation. Clue is a consumer mobile product; no public developer API or partner API portal has been identified. This entry catalogs the company surface for the API Evangelist index.

Clue (BioWink) is profiled on the APIs.io network. Tagged areas include Femtech, Women’s Health, Reproductive Health, Period Tracker, and Cycle Tracking.

Clue (BioWink)’s developer surface includes support and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

7.7/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Femtech Women's Health Reproductive HealthPeriod TrackerCycle Tracking Fertility PregnancyPerimenopauseResearch Data Consumer App

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 7.7/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.8 / 17

Access Clarity 1.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 3.8 / 9

Regulatory Posture 3.0 / 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

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/.

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 github.com/api-evangelist/clue-app: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 2

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

Clue App Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Clue App Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

Careers

Careers

LinkedIn

Other 1

Properties that don't map to a standard resource type

Research

Research

Source (apis.yml)

aid: clue-app
url: https://raw.githubusercontent.com/api-evangelist/clue-app/refs/heads/main/apis.yml
name: Clue (BioWink)
type: Index
kind: company
description: Clue, operated by BioWink GmbH in Berlin, Germany, is a science-driven menstrual, ovulation, pregnancy, and reproductive
  health tracking app with 100M+ downloads across 190+ countries. The product portfolio spans Clue (free tier), Clue Plus
  (subscription), Clue Conceive, Clue Pregnancy, Clue Perimenopause, and a "Clue (No Period)" mode for non-bleeding hormonal
  cycles. Clue Connect provides partner sharing. The company contributes anonymized real-world data to academic research partnerships
  with Stanford, University of Oxford, UC Berkeley, MIT, and the Bill & Melinda Gates Foundation. Clue is a consumer mobile
  product; no public developer API or partner API portal has been identified. This entry catalogs the company surface for
  the API Evangelist index.
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: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/clue-app.png
access: 3rd-Party
created: '2026-05-23'
modified: '2026-05-23'
position: Consuming
tags:
- Femtech
- Women's Health
- Reproductive Health
- Period Tracker
- Cycle Tracking
- Fertility
- Pregnancy
- Perimenopause
- Research Data
- Consumer App
specificationVersion: '0.23'
apis: []
common:
- type: VulnerabilityDisclosure
  url: security/clue-app-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/clue-app-domain-security.yml
- type: Website
  url: https://helloclue.com/
- type: PrivacyPolicy
  url: https://helloclue.com/privacy
- type: Careers
  url: https://helloclue.com/careers
- type: Support
  url: https://support.helloclue.com/hc/en-us
- type: Research
  url: https://helloclue.com/articles/about-clue/clues-scientific-research
- type: LinkedIn
  url: https://www.linkedin.com/company/biowink-gmbh
maintainers:
- FN: API Evangelist
  url: https://apievangelist.com

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/clue-app"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/clue-app/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/clue-app/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.