# Grammarly

> A writing assistant that checks grammar, spelling and tone wherever you type, with AI rewriting and generation.

Grammarly runs as a browser extension, desktop app and add-in, so it checks writing across email, docs and web apps. The Free plan covers core spelling and grammar plus 100 AI prompts a month. Pro adds full-sentence rewrites, tone adjustment, plagiarism and AI-text detection, one style guide and one brand tone, and 2,000 AI prompts per member per month. The company now operates under the Superhuman name, and Enterprise is sold through Superhuman Go.

- Vendor: Superhuman (formerly Grammarly, Inc.)
- Website: https://www.grammarly.com
- Category: writing
- Free plan: yes
- Last reviewed: 2026-10-13
- Canonical: https://onelesstool.com/tools/grammarly
- JSON: https://onelesstool.com/api/v1/tools/grammarly

## Plans

| Plan | USD | Unit | Evidence | Source |
|---|---|---|---|---|
| Free | $0 | seat/month | verified 2026-10-13 | https://www.grammarly.com/plans |
| Pro | $12 (annual billing) | seat/month | verified 2026-10-13 | https://www.grammarly.com/plans |
| Enterprise | not listed | seat/month | verified 2026-10-13 | https://www.grammarly.com/plans |

## Capabilities

| Capability | Fit | Plans | Limitations |
|---|---|---|---|
| Proofread and improve writing (`grammar-editing`) | native | all | Free plan lacks full-sentence rewrites and tone adjustment; Suggestions can flatten a distinctive voice |
| Write marketing and business copy (`writing-copy`) | partial | all | Free plan capped at 100 AI prompts per month; Better at editing than long-form drafting |
| General-purpose AI assistant (`ai-chat-assistant`) | partial | all | Narrower than general AI chat tools; Prompt caps on Free and Pro |
| Research a topic on the web with citations (`web-research`) | workaround | all | Not a full research tool; Plan availability unconfirmed |

## Why people pay for it

- Inline grammar and clarity fixes in almost every app and website
- Full-sentence rewrites and tone adjustment
- Plagiarism and AI-generated text detection
- Style guides and brand tones for consistent team writing
- Fluency help for non-native English writers

## Reasons to keep paying

- Works in nearly every text field without copy-pasting into a chatbot
- Team style guides and snippets enforce consistent wording
- Plagiarism checks against a large web and publication index

## Risks

- **sensitive_data** (medium): The extension reads text in many apps; review which sites it is enabled on for confidential work.
- **compliance** (low): SSO, SCIM, DLP and BYOK are Enterprise only.

Data portability: easy — Your writing stays in the apps you use. Style guides, snippets and brand tones would need to be recreated elsewhere.

## Replacement workflows

- [Drop Grammarly when you already pay for ChatGPT, Claude, Gemini or Copilot](https://onelesstool.com/workflows/drop-grammarly-with-existing-ai.md)

## Sources

- Grammarly plans: https://www.grammarly.com/plans (accessed 2026-10-13)