Grammarly
Writing assistantIndependent review. IonBin has no partnership with Grammarly and was not paid for this page. Our evaluation is our own, based on public documentation and our research. Product names are trademarks of their owners and are used for identification only. How disclosure works.
Writing assistant for grammar, clarity and tone across apps. Its developer APIs, including the Writing Score API, are for Enterprise and Education accounts. No official Grammarly MCP server found.
- Teams that want a consistent quality check on everything they write
- Individuals or small teams that want API access
Top use cases
- Score drafts with the Writing Score API before publishing (Enterprise and Education accounts) source ↗
In depth
Plans
Grammarly lists Free ($0; 100 AI prompts a month), Pro ($12, with a free trial; 2,000 AI prompts per member a month) and Enterprise (contact sales), which it says is available through Superhuman Go. The page did not state Pro's billing term in our check. Checked 2026-10-17. source ↗
How to use it with AI
How Grammarly connects to each AI platform: native connector or MCP, API through code the agent writes, browser control, or file upload.
| Platform | MCP / connector | API (agent-written code) | Browser | Upload / export |
|---|---|---|---|---|
| Claude (incl. Claude Code) | No documented route | Confirmed Claude (incl. Claude Code) can run code; Grammarly publishes an API. Grammarly API ↗Claude (incl. Claude Code) docs ↗ | Confirmed Claude Code with the Claude in Chrome extension (Chrome, Edge and other Chromium browsers) Claude (incl. Claude Code) browser docs ↗ | Confirmed Export from Grammarly, then works on the files in your project; chat accepts attachments Claude (incl. Claude Code) docs ↗ |
| OpenAI Codex | No documented route | Confirmed OpenAI Codex can run code; Grammarly publishes an API. Grammarly API ↗OpenAI Codex docs ↗ | Confirmed Only in the ChatGPT desktop app; not in the Codex CLI or IDE extension OpenAI Codex browser docs ↗ | Confirmed Export from Grammarly, then works on local repositories OpenAI Codex docs ↗ |
| Google Antigravity | No documented route | Confirmed Google Antigravity can run code; Grammarly publishes an API. Grammarly API ↗Google Antigravity docs ↗ | Confirmed Browser subagent via /browser, documented as an Antigravity App feature; the IDE has separate browser docs Google Antigravity browser docs ↗ | Confirmed Export from Grammarly, then works on local projects and worktrees Google Antigravity docs ↗ |
Confirmed means both the tool's and the platform's official docs describe that route (links in the cell); IonBin has not tested every pairing. Not documented means it may work, but no official docs describe that route end to end. Checked Oct 17, 2026.
Agent compatibility
| Level | Status | Detail / source |
|---|---|---|
| Native connector / MCP | No | No official MCP server found (2026-10-17); a community server automates the web app instead of using Grammarly's APIs |
| API / CLI | Yes | Official docs ↗ |
| Browser-only | No | Web app; also reachable programmatically |
| Bulk upload / import | Yes | API evaluation of documents at scale, for Enterprise and Education accounts (https://developer.grammarly.com/) |
Recorded Oct 17, 2026. Setup and plan limits vary; check the vendor's docs. How levels are assigned.
Works well with
No confirmed MCP server yet.
Via its API, through automation hubs: Gumloop, Make, n8n, Zapier.
Workflows using this tool
- Add a writing-quality gate before publishing Reviewed
- Draft an on-brand campaign with Jasper Reviewed
Review
No long-form review yet. Verdict is based on research, not hands-on testing.