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| Feature | Free | Premium $4.99/mo | Pro $9/mo |
|---|---|---|---|
| 110+ calculators | ✓ | ✓ | ✓ |
| Mobile & desktop | ✓ | ✓ | ✓ |
| Save calculations | — | Unlimited | Unlimited |
| Export to PDF | — | ✓ | ✓ |
| Compare scenarios | — | ✓ | ✓ |
| Ad-free browsing | — | ✓ | ✓ |
| REST API access | — | — | 10,000 calls/day |
| MCP for ChatGPT / Claude | — | — | ✓ |
| API keys | — | — | Up to 20 |
| Priority support | — | Email + priority |
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