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
Obsidian
Private, local-first knowledge base using markdown files and bidirectional links
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 & spelling, 100 AI prompts/month | Free Free without limits; no sign-up; all core features on every platform |
| Pro | $30 2,000 AI prompts/month, full rewrites, plagiarism & AI detection; $12/mo billed annually | $5 $4/mo billed annually; end-to-end encrypted sync across devices, version history, shared vaults |
| Superhuman Business | $40 Email + writing suite, style guides, analytics; $33/member/mo billed annually | $10 $8/mo billed annually (per site); publish notes as a customizable website |
| Enterprise | Free Custom pricing; SSO/SAML, SCIM, BYOK, dedicated support | $25 One-time payment; early access to beta versions, community badges |
| Commercial | — | $50 Per user/year; optional license for business use (not required to use commercially) |
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