Grammarly

Grammarly is an AI writing-assistance company whose enterprise developer platform exposes a set of REST APIs that bring Grammarly's writing intelligence into an organization's own applications, business-intelligence systems, and IT tooling. The Grammarly APIs cover writing-quality scoring, AI generated-content detection, plagiarism detection, communication analytics, and license management, all secured with OAuth 2.0 client credentials and scoped permissions against the base URL https://api.grammarly.com/ecosystem/api/. Certified Readability Score and Tone Analysis APIs are announced as coming soon. Grammarly was surfaced as a portfolio company of IVP.

Grammarly is listed with 5 APIs on the APIs.io network. Tagged areas include Company, Artificial Intelligence, Writing Assistance, Productivity, and Natural Language Processing.

Grammarly’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 24 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

49.1/100 developing ▬ flat Agent 3/100 human only Front door AI 5/6 prominent Heartbeat 32/100 slowing saas Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

5 APIs

Company Artificial IntelligenceWriting AssistanceProductivity Natural Language Processing Analytics Content OAuth Enterprise Authentication

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 49.1/100 · developing

Contract Quality 0.0 / 21

Developer Ergonomics 10.9 / 17

Access Clarity 15.2 / 17

Operational Transparency 4.1 / 11

Contract Governance 1.9 / 10

Discoverability 6.7 / 9

Regulatory Posture 5.7 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 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 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 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):

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
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
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

12 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
Contract Governance scores 18.2 — up to +9.8 composite points
Operational Transparency scores 36.8 — up to +8.2 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/grammarly/apis.yml: open an issue on github.com/api-evangelist/grammarly 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
Workplace Collaboration App Marketplaces	builds-on	50.7	-	-
Zoom App Marketplace and Partner Ecosystem (builders and partners on Zoom)	builds-on	50.7	-	-
Atlassian Marketplace (builders on Jira, Confluence, Bitbucket)	builds-on	50.7	-	-
Browser Extension Stores (company-published Firefox add-ons; Chrome Web Store unreadable)	builds-on	50.7	-	-
TX-RAMP Certified Cloud Products (Texas DIR)	builds-on	50.7	-	-
Smartsheet Marketplace (connectors and partner-built solutions on Smartsheet)	builds-on	50.7	-	-
Hugging Face Hub Organisations	builds-on	50.7	-	-

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.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OAuth

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 5

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

Grammarly Analytics API

Programmatic access to Grammarly usage and communication-performance analytics for integration into business-intelligence systems.

Grammarly License Management API

Allocate and reallocate Grammarly licenses from software asset management / IT-governance tooling.

Grammarly Writing Score API

Score content on correctness, engagement, clarity, and delivery for organizational content governance (Beta).

Grammarly AI Detection API

Detect AI-generated content and help demonstrate original authorship (Beta).

Grammarly Plagiarism Detection API

Detect plagiarism against published sources to help teams produce original work (Beta).

Pricing Plans 2

Published pricing tiers and plan structures.

Grammarly Plans Pricing

3 plans

PLANS

Grammarly Price Estimates

0 plans

PLANS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Grammarly Finops

FINOPS

Security Posture 4

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

Grammarly Authentication

oauth2 · 1 scheme

SECURITY

Grammarly Domain Security

TLSv1.3 · DMARC

SECURITY

Grammarly Vulnerability Disclosure

Hackerone · security.txt · contact published

SECURITY

Grammarly Trust Center

SOC 2, ISO 27001, GDPR

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Grammarly Scopes

5 scopes

SCOPES

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Lifecycle

Lifecycle

Conformance

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 8

Authentication, authorization, and security posture

TrustCenter

Compliance

Security

Authentication

OAuthScopes

SecurityTxt

DomainSecurity

VulnerabilityDisclosure

VulnerabilityDisclosure

Scroll for all 8

Operate 3

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Deprecation

Deprecation

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 3

The organization behind the API

BlogRSS

BlogRSS

Website

Website

Blog

Blog

Source (apis.yml)

aid: grammarly
name: Grammarly
description: Grammarly is an AI writing-assistance company whose enterprise developer platform exposes a set of REST APIs
  that bring Grammarly's writing intelligence into an organization's own applications, business-intelligence systems, and
  IT tooling. The Grammarly APIs cover writing-quality scoring, AI generated-content detection, plagiarism detection, communication
  analytics, and license management, all secured with OAuth 2.0 client credentials and scoped permissions against the base
  URL https://api.grammarly.com/ecosystem/api/. Certified Readability Score and Tone Analysis APIs are announced as coming
  soon. Grammarly was surfaced as a portfolio company of IVP.
url: https://raw.githubusercontent.com/api-evangelist/grammarly/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - scopes
  - security
  generated: '2026-11-02'
  method: derived
image: https://www.grammarly.com/favicon.ico
x-type: company
x-source: vc-portfolio
x-backed-by:
- ivp
x-tier: enriched
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
x-docs-platform: vitepress
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
tags:
- Company
- Artificial Intelligence
- Writing Assistance
- Productivity
- Natural Language Processing
- Analytics
- Content
- OAuth
- Enterprise
- Authentication
tags_raw:
- Company
- Ai
- Writing Assistance
- Productivity
- Natural Language Processing
- Analytics
- Content
- OAuth
- Enterprise
- Authentication
apis:
- name: Grammarly Analytics API
  description: Programmatic access to Grammarly usage and communication-performance analytics for integration into business-intelligence
    systems.
  humanURL: https://developer.grammarly.com/
  baseURL: https://api.grammarly.com/ecosystem/api/
  properties:
  - type: Documentation
    url: https://developer.grammarly.com/
  - type: GettingStarted
    url: https://developer.grammarly.com/your-first-api-request.html
- name: Grammarly License Management API
  description: Allocate and reallocate Grammarly licenses from software asset management / IT-governance tooling.
  humanURL: https://developer.grammarly.com/
  baseURL: https://api.grammarly.com/ecosystem/api/
  properties:
  - type: Documentation
    url: https://developer.grammarly.com/
- name: Grammarly Writing Score API
  description: Score content on correctness, engagement, clarity, and delivery for organizational content governance (Beta).
  humanURL: https://developer.grammarly.com/
  baseURL: https://api.grammarly.com/ecosystem/api/
  properties:
  - type: Documentation
    url: https://developer.grammarly.com/
- name: Grammarly AI Detection API
  description: Detect AI-generated content and help demonstrate original authorship (Beta).
  humanURL: https://developer.grammarly.com/
  baseURL: https://api.grammarly.com/ecosystem/api/
  properties:
  - type: Documentation
    url: https://developer.grammarly.com/
- name: Grammarly Plagiarism Detection API
  description: Detect plagiarism against published sources to help teams produce original work (Beta).
  humanURL: https://developer.grammarly.com/
  baseURL: https://api.grammarly.com/ecosystem/api/
  properties:
  - type: Documentation
    url: https://developer.grammarly.com/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/grammarly-plans-pricing.yml
- url: https://www.grammarly.com/blog/feed/
  type: BlogRSS
- type: Website
  url: https://www.grammarly.com
- type: DeveloperPortal
  url: https://developer.grammarly.com/
- type: Documentation
  url: https://developer.grammarly.com/
- type: APIReference
  url: https://developer.grammarly.com/
- type: GettingStarted
  url: https://developer.grammarly.com/your-first-api-request.html
- type: Support
  url: https://support.grammarly.com/
- type: Blog
  url: https://www.grammarly.com/blog/
- type: GitHubOrganization
  url: https://github.com/grammarly
- type: Pricing
  url: https://www.grammarly.com/plans
- type: SignUp
  url: https://www.grammarly.com/signup
- type: TermsOfService
  url: https://www.grammarly.com/terms-of-service
- type: PrivacyPolicy
  url: https://www.grammarly.com/privacy-policy
- type: StatusPage
  url: https://status.grammarly.com
- type: TrustCenter
  url: security/grammarly-trust-center.yml
- type: Compliance
  url: https://www.grammarly.com/security
- type: Security
  url: https://hackerone.com/grammarly
- type: Authentication
  url: authentication/grammarly-authentication.yml
- type: OAuthScopes
  url: scopes/grammarly-scopes.yml
- type: Packages
  url: packages/grammarly-packages.yml
- type: SDKs
  url: packages/grammarly-packages.yml
- type: WellKnown
  url: well-known/grammarly-well-known.yml
- type: SecurityTxt
  url: well-known/grammarly-security.txt
- type: LLMsTxt
  url: llms/grammarly-llms.txt
- type: Conventions
  url: conventions/grammarly-conventions.yml
- type: Lifecycle
  url: lifecycle/grammarly-lifecycle.yml
- type: Deprecation
  url: lifecycle/grammarly-lifecycle.yml
- type: Conformance
  url: conformance/grammarly-conformance.yml
- type: DomainSecurity
  url: security/grammarly-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/grammarly-vulnerability-disclosure.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Grammarly API — frequently asked questions

Does Grammarly have an API?

Yes. APIs.io lists 5 APIs from Grammarly, including Grammarly Analytics API, Grammarly License Management API and Grammarly Writing Score API, and 2 more.

How do I authenticate with the Grammarly API?

Grammarly uses bearer-token authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Grammarly Authentication.

How much does the Grammarly API cost?

APIs.io lists 3 pricing plans for Grammarly, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Grammarly API ready for AI agents?

Grammarly has a Kin Score of 49.1 out of 100 (developing) and an Agent Readiness score of 2.5 (human-only), scored by API Evangelist on 2026-11-02.

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