Readwise

Readwise is a service that helps users retain and revisit their reading highlights and annotations across various platforms. It surfaces saved highlights, offers spaced‑repetition reminders, and integrates with apps like Kindle, Instapaper, Pocket, and many note‑taking tools, enabling a continuous learning workflow for readers and researchers alike.

Readwise is listed with 2 APIs on the APIs.io network. Tagged areas include Reading, Productivity, Knowledge Management, SaaS, and API.

The Readwise catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Readwise’s developer surface includes CLI, changelog, authentication, getting-started guide, documentation, engineering blog, pricing, and 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

48.3/100 developing Agent 26/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

2 APIs

Reading Productivity Knowledge ManagementSaaSAPI

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 48.3/100 · developing

Contract Quality 5.2 / 21

Developer Ergonomics 8.5 / 17

Access Clarity 13.0 / 17

Operational Transparency 3.5 / 11

Contract Governance 3.6 / 10

Discoverability 4.9 / 9

Regulatory Posture 5.1 / 15

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 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

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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):

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
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

8 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 24.3 — up to +18.9 composite points
Developer Ergonomics scores 50.0 — up to +10.0 composite points
Operational Transparency scores 31.6 — up to +8.9 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/readwise/apis.yml: open an issue on github.com/api-evangelist/readwise 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 →

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

Readwise API

Readwise API allows creating, fetching, and updating highlights on behalf of the user.

Readwise API

Readwise API as documented publicly: 14 operations. Contract generated from the documentation by API Evangelist (2026-10-28); not the provider's own document.

Pricing Plans 1

Published pricing tiers and plan structures.

Readwise Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Readwise Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Readwise Context

17 classes · 26 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Readwise API Rules

10 rules · 8 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

DeleteApiV3Delete0000Ffff2222Eeee3333Dddd4444Response

3 properties

JSON SCHEMA

GetApiV3ListResponse2

3 properties

JSON SCHEMA

GetApiV3TagsResponse

3 properties

JSON SCHEMA

PostApiV2HighlightsResponse

3 properties

JSON SCHEMA

PostApiV2ReviewCompleteResponse

4 properties

JSON SCHEMA

PostApiV3SaveRequest2

16 properties

JSON SCHEMA

Security Posture 2

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

Readwise Authentication

1 scheme

SECURITY

Readwise Domain Security

TLSv1.3 · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Readwise Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 2

Portal, sign-up, and the first successful call

Login

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

CLI

CLI

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

Authentication

SecurityTxt

SecurityTxt

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

ChangeLog

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: readwise
name: Readwise
description: Readwise is a service that helps users retain and revisit their reading highlights and annotations across various
  platforms. It surfaces saved highlights, offers spaced‑repetition reminders, and integrates with apps like Kindle, Instapaper,
  Pocket, and many note‑taking tools, enabling a continuous learning workflow for readers and researchers alike.
url: https://artifacts.apis.io/readwise/apis.yml
image: https://readwise.io/favicon.ico
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-28'
modified: '2026-10-28'
tags:
- Reading
- Productivity
- Knowledge Management
- SaaS
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/readwise-plans-pricing.yml
- type: Spectral
  url: rules/readwise-rules.yml
- type: JSONLD
  url: json-ld/readwise-context.jsonld
- type: Vocabulary
  url: vocabulary/readwise-vocabulary.yml
- type: DataModel
  url: data-model/readwise-data-model.yml
- type: CLI
  url: cli/readwise-cli.yml
- type: ChangeLog
  url: changelog/readwise-changelog.yml
- type: Authentication
  url: authentication/readwise-authentication.yml
- type: Conformance
  url: conformance/readwise-conformance.yml
- type: LLMsTxt
  url: llms/readwise-llms.txt
- type: SecurityTxt
  url: well-known/readwise-cloud-security.txt
- type: SecurityTxt
  url: well-known/readwise-chatgpt-security.txt
- type: WellKnown
  url: well-known/readwise-well-known.yml
- type: Hosts
  url: hosts/readwise-hosts.yml
- type: Vendors
  url: vendors/readwise-vendors.yml
- type: SDKs
  url: packages/readwise-packages.yml
- type: Packages
  url: packages/readwise-packages.yml
- type: Login
  url: https://readwise.io/accounts/login/
- type: ChangeLog
  url: https://readwise.io/changelog
- type: GettingStarted
  url: https://readwise.io/apple_notes
- type: DomainSecurity
  url: security/readwise-domain-security.yml
- type: Website
  url: https://readwise.io/
- type: Documentation
  url: https://docs.readwise.io/
- type: Blog
  url: https://blog.readwise.io/
- type: Pricing
  url: https://readwise.io/pricing
- type: TermsOfService
  url: https://readwise.io/terms-of-service
- type: PrivacyPolicy
  url: https://readwise.io/privacy-policy
- type: GitHubOrganization
  url: https://github.com/readwise
apis:
- name: Readwise API
  description: Readwise API allows creating, fetching, and updating highlights on behalf of the user.
  humanURL: https://readwise.io/api_deets
  baseURL: https://readwise.io/api/v2/
  properties: []
  aid: readwise:readwise-api-2
- aid: readwise:readwise-api
  name: Readwise API
  description: 'Readwise API as documented publicly: 14 operations. Contract generated from the documentation by API Evangelist
    (2026-10-28);

    not the provider''s own document.'
  humanURL: https://readwise.io/reader_api
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/readwise-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/readwise-post-api-v3-save-request2-schema.json
  - type: JSONSchema
    url: json-schema/readwise-post-api-v2-highlights-response-schema.json
  - type: JSONSchema
    url: json-schema/readwise-post-api-v2-review-complete-response-schema.json
  - type: JSONSchema
    url: json-schema/readwise-get-api-v3-list-response2-schema.json
  - type: JSONSchema
    url: json-schema/readwise-get-api-v3-tags-response-schema.json
  - type: JSONSchema
    url: json-schema/readwise-delete-api-v3-delete0000-ffff2222-eeee3333-dddd4444-response-schema.json
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: Readwise provides API documentation as HTML pages without a published OpenAPI, AsyncAPI, GraphQL, or other machine‑readable
    contract.
  evidence:
  - url: https://readwise.io/api_deets
    status: 200
  checked: '2026-10-29'
x-submission-probe: 200, 2026-10-26
x-enrichment:
  date: '2026-10-28'
  status: nochange
  artifacts_added: 0
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

Readwise API — frequently asked questions

Does Readwise have an API?

Yes. APIs.io lists 2 APIs from Readwise, including Readwise API and Readwise API.

Is there an OpenAPI specification for the Readwise API?

Yes. APIs.io indexes 1 OpenAPI specification for Readwise, each linked for download from this page.

How do I authenticate with the Readwise API?

Readwise uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Readwise Authentication.

How much does the Readwise API cost?

APIs.io lists 4 pricing plans for Readwise, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Readwise API ready for AI agents?

Readwise has a Kin Score of 48.3 out of 100 (developing) and an Agent Readiness score of 25.9 (agent-aware), scored by API Evangelist on 2026-10-31.

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