Three categories of AI grammar tools on Mac in 2026: Apple Intelligence Writing Tools (built-in, free), Grammarly (paid, fine-grained), Lazie (AI rewrite + translation in one).
Apple Intelligence Writing Tools
- Built into macOS 15+ on M1+ with 8GB+ RAM
- Free
- Proofread, rewrite, summarize
- Works in most macOS apps
- Uses Apple's on-device + optional ChatGPT integration
Grammarly for Mac
- Fine-grained grammar suggestions
- Tone detection
- Plagiarism check (paid)
- Free tier + Premium ($12/mo)
- Works as system-wide keyboard extension
Lazie (AI rewrite + translation)
- System-wide on Mac via selection
- 3 rewrite directions per selection (concise/formal/casual)
- Powered by Claude or GPT (your choice)
- Bundles translation in the same tool
- Free + BYOK
When to use which
- Quick grammar check on most macOS apps — Apple Writing Tools (free, built-in)
- Fine-grained grammar + plagiarism + tone analysis — Grammarly AI rewrite with tone control + translation combined — Lazie
For most users: Apple Writing Tools covers basic grammar + Lazie covers tone-preserving rewrite + translation. Grammarly added if you need plagiarism or in-depth grammar coaching.
Originally published at lazie.ai — the AI translator for Mac.
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