Grammarly
Obsidian
| Feature | Grammarly | Obsidian |
|---|---|---|
| Pricing | Free / from $12/mo | Free / from $4/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.7 / 5 |
| Best For | writers, students, professionals, non-native-speakers | researchers, writers, developers, knowledge-workers |
| Founded | 2009 | 2020 |
| Grammar | ✓ | ✗ |
| Spelling | ✓ | ✗ |
| Tone | ✓ | ✗ |
| Clarity | ✓ | ✗ |
| Plagiarism | ✓ | ✗ |
| Browser Extension | ✓ | ✗ |
| Markdown | ✗ | ✓ |
| Backlinks | ✗ | ✓ |
| Graph View | ✗ | ✓ |
| Plugins | ✗ | ✓ |
| Themes | ✗ | ✓ |
| Canvas | ✗ | ✓ |
✓ Grammarly Pros
- Works everywhere
- Clear suggestions
- Tone detection
- Plagiarism checker
✗ Grammarly Cons
- Premium is pricey
- Can over-correct
- Privacy concerns
✓ Obsidian Pros
- 100% offline
- Local-first
- Plugin ecosystem
- Graph view
- Free for personal use
✗ Obsidian Cons
- No real-time collaboration
- Steep learning curve
- Mobile app is basic
The Verdict
Grammarly is best for writers and students who need works everywhere. Obsidian is ideal for researchers and writers looking for 100% offline. Both tools offer free plans, so try each to see which fits your workflow.