Developers write more prose than they think. Commit messages, PR descriptions, documentation, README files, Slack messages, emails to clients, blog posts, and technical specs. Bad writing creates confusion, slows reviews, and makes your docs useless.
Grammarly has been the default writing assistant for years. But now Claude, GPT, and AI coding assistants can also check and improve writing. Do you still need a dedicated tool?
What Grammarly does well
- Real-time corrections in every text field (browser, Slack, email, docs)
- Tone detection — is this email too aggressive? Too passive?
- Style consistency — enforces your team’s style guide
- Plagiarism detection (Premium)
- Works everywhere — browser extension, desktop app, mobile keyboard
What AI assistants do better
- Technical writing — Claude and GPT understand code context, Grammarly doesn’t
- Documentation generation — AI can write docs from code, Grammarly can only fix existing text
- Translation — AI handles multilingual docs natively
- Rewriting — “Make this more concise” or “Explain this for a junior developer”
Grammarly pricing breakdown
| Plan | Price | Key features |
|---|---|---|
| Free | $0 | Grammar, spelling, punctuation in browser |
| Premium | $12/mo | Tone, clarity, style, plagiarism, rewrites |
| Business | $15/user/mo | Style guides, brand tones, admin controls, analytics |
For comparison, Claude Pro costs $20/month and handles writing, coding, analysis, and everything else. GPT Plus is also $20/month. So the question becomes: is Grammarly’s always-on browser integration worth $12/month on top of your AI subscription?
The verdict
Keep Grammarly if:
- You write a lot of non-technical content (emails, proposals, blog posts)
- You want passive, always-on correction without thinking about it
- Your team needs consistent style enforcement
- English isn’t your first language (Grammarly’s real-time corrections are faster than asking AI)
- You write in Google Docs or Notion frequently (Grammarly integrates natively)
Skip Grammarly if:
- You mostly write code and technical docs
- You already use Claude or GPT daily
- You’re comfortable asking AI to review your writing
- Budget is tight ($12/month for Grammarly Premium adds up)
The developer writing stack
For most developers, this combination works:
- AI coding assistant (Claude Code, Cursor) — for code, technical docs, and commit messages
- Grammarly Free — for browser-based writing (emails, Slack, PR descriptions)
- AI chat (Claude, GPT) — for longer writing tasks (blog posts, proposals, specs)
The free Grammarly tier catches basic grammar and spelling errors in real-time. That’s enough for most developers. The Premium features (tone, style, plagiarism) are more valuable for content creators and marketers.
For technical documentation specifically
AI assistants are better than Grammarly for technical docs because they understand:
- Code snippets and their context
- Technical terminology (Grammarly flags valid technical terms as errors)
- API documentation conventions
- The difference between “it’s” in prose vs
itsin code comments
If you’re writing docs for your MCP server, API guide, or deployment instructions, use your AI coding assistant. It knows the domain.
Where Grammarly still wins: real-time passive correction
The one thing no AI assistant replicates well is Grammarly’s passive, always-on correction. When you’re typing a Slack message, Grammarly underlines errors instantly. With AI assistants, you have to actively ask for a review. That friction matters.
For developers who communicate heavily in English (especially non-native speakers), the passive correction alone justifies the free tier. You catch embarrassing typos in client emails before hitting send, without any extra steps.
Common developer writing mistakes Grammarly catches
- Passive voice in docs — “The function is called by the user” vs “The user calls the function”
- Wordy sentences — “In order to” vs “To”
- Inconsistent tense — switching between present and past in the same doc
- Missing articles — common for non-native English speakers
- Run-on sentences — especially in commit messages and PR descriptions
The bottom line
Use Grammarly Free for passive browser correction. Use your AI coding assistant for everything else. Only upgrade to Grammarly Premium if you write substantial non-technical content regularly or manage a team that needs style consistency.
The $12/month is better spent on an AI coding tool subscription if you have to choose one.
Related: Best AI Coding Agents · Claude Code Guide · AI Coding Tools Pricing · Notion for Developers