writing
Grammarly vs Obsidian
A detailed side-by-side comparison to help you choose.
Grammarly
AI writing assistant that checks grammar, style, tone, and clarity across all platforms
8.0Excellent
Obsidian
Private, local-first knowledge base using markdown files and bidirectional links
7.5Very Good
Our Verdict
We recommend Grammarly
Grammarly edges ahead with stronger scores in key areas.
Feature Comparison
| Feature | Grammarly | Obsidian |
|---|---|---|
| API Access | ||
| Plugins / Extensions | ||
| Image Generation | ||
| Code Execution | ||
| File Upload | ||
| Web Search | ||
| Max Context Window | 16K tokens | N/A |
Pricing Comparison
| Tier | Grammarly | Obsidian |
|---|---|---|
| Free | Free Basic grammar and spelling corrections | Free Free for personal use, all core features |
| Premium | $30 Advanced style, clarity, tone, plagiarism detection | $50 One-time license for business use |
| Business | $25 Per user/month, brand tone, style guide, analytics | $10 End-to-end encrypted cloud sync add-on |
| Publish | — | $16 Publish notes as a public website add-on |
Score Breakdown
| Dimension | Grammarly | Obsidian |
|---|---|---|
| Ease of Use | 10.0 | 6.0 |
| Features | 7.0 | 8.0 |
| Value for Money | 7.0 | 10.0 |
| Support | 8.0 | 6.0 |
| Overall | 8.0 | 7.5 |
Pros & Cons
Grammarly
Pros
- +Works everywhere: browser, Word, Google Docs, Outlook
- +Real-time suggestions don't interrupt your writing flow
- +Tone detection helps match the right voice for your audience
- +Plagiarism checker integrated into premium plans
Cons
- −Premium plan is expensive relative to the feature set
- −Not a full AI writing assistant — focused on editing, not generation
- −Free tier is quite limited compared to competitors
Obsidian
Pros
- +Completely free for personal use with no feature limitations
- +All notes stored locally as plain markdown files
- +Massive plugin ecosystem with 1000+ community plugins
- +Bidirectional linking and graph view for knowledge mapping
Cons
- −Steep learning curve to unlock full potential
- −No built-in AI — requires plugins for AI features
- −Sync and publish features cost extra