Readwise vs send/links vs Spark Mail vs Superhuman
| Attribute | ||||
|---|---|---|---|---|
| Category | Productivity & Collaboration | Productivity & Collaboration | Communication | Communication |
| Pricing | Paid | Free tier | Free tier | Paid |
| Starting price | $5.59/month | Free | $4.99/month | $30/month |
| Free tier | No | Yes | Yes | No |
| Free trial | Yes | Unknown | Yes | Yes |
| Deployment | — | — | — | — |
| API available | Unknown | Unknown | Unknown | Unknown |
| Platforms | — | — | — | — |
| Certifications | — | — | — | — |
| Integrations | 1 | — | — | 5 |
| Company | — | — | — | — |
| Feature attributes | ||||
Also consider
Unknown values show as “Unknown”/“—”. Nothing is inferred — see each tool page for sources.