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 publishes 5 APIs on the APIs.io network. Tagged areas include Company, Ai, 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 22 more developer resources.

🌐 Visit website 📡 Source on GitHub
39.0/100 thin Agent 16/100 agent aware Full breakdown ↓
scored 2026-07-20 · rubric v0.4
5 APIs 0 Features
CompanyAiWriting AssistanceProductivityNatural Language ProcessingAnalyticsContentOAuthEnterprise

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 39.0/100 · thin
Contract Quality 0.0 / 25
Developer Ergonomics 11.7 / 20
Commercial Clarity 12.1 / 20
Operational Transparency 5.1 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 16/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
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 4 / 4
Consent & Bot Identity 3 / 3
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/grammarly: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs

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).

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
TrustCenter
 Compliance
Compliance
 Security
Security
 Authentication
Authentication
 OAuthScopes
OAuthScopes
 SecurityTxt
SecurityTxt
 DomainSecurity
DomainSecurity
 VulnerabilityDisclosure
VulnerabilityDisclosure

Scroll for all 8

Operate 3

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage
 Deprecation
Deprecation

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
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
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: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Ai
- Writing Assistance
- Productivity
- Natural Language Processing
- Analytics
- Content
- OAuth
- Enterprise
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: 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