Marker

Marker is a writing tool for people who believe in writing — a calm, focused space for thinking and writing that acts as your partner and editor from first idea to final draft. Backed by Index Ventures, Marker sits in the future-of-work space and offers a distraction-free web application (my.marker.page) for drafting long-form writing. It is a consumer product web app: as of this enrichment pass it publishes no public developer API, SDKs, developer documentation, or /.well-known discovery surface, so this profile captures its identity and a live domain-security probe only.

Marker is profiled on the APIs.io network. Tagged areas include Company, Future Of Work, Writing, Productivity, and Text Editor.

Marker’s developer surface includes signup flow and 5 more developer resources.

🌐 Visit website 📡 Source on GitHub

11.8/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0

0 APIs

Company Future Of Work Writing ProductivityText EditorWeb App

Kin Score

Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0

Composite quality — 11.8/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Access Clarity 6.8 / 20

Operational Transparency 0.0 / 13

Contract Governance 0.0 / 12

Discoverability 5.0 / 10

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

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/marker: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

About

About

Source (apis.yml)

aid: marker
name: Marker
description: 'Marker is a writing tool for people who believe in writing — a calm, focused space for thinking and writing
  that acts as your partner and editor from first idea to final draft. Backed by Index Ventures, Marker sits in the future-of-work
  space and offers a distraction-free web application (my.marker.page) for drafting long-form writing. It is a consumer product
  web app: as of this enrichment pass it publishes no public developer API, SDKs, developer documentation, or /.well-known
  discovery surface, so this profile captures its identity and a live domain-security probe only.'
url: https://raw.githubusercontent.com/api-evangelist/marker/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- index-ventures
x-tier: stub
x-tier-reason: portfolio-lead
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Future Of Work
- Writing
- Productivity
- Text Editor
- Web App
image: https://marker.page/images/opengraph.png
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://marker.page
- type: About
  url: https://marker.page/about.html
- type: SignUp
  url: https://my.marker.page
- type: TermsOfService
  url: https://marker.page/terms.html
- type: PrivacyPolicy
  url: https://marker.page/privacy.html
- type: DomainSecurity
  url: security/marker-domain-security.yml
x-enrichment:
  date: '2026-07-20'
  status: minimal
  artifacts_added: 1
  pass: local-v1

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