21st Agents SDK vs Astro vs Notion AI vs Remix
| Attribute | ||||
|---|---|---|---|---|
| Category | Developer Tools | Developer Tools | Content & Writing | Developer Tools |
| Pricing | Paid | Free tier | Paid | Free tier |
| Starting price | $6/month | $0/month | $10/month | $0/month |
| Free tier | No | Yes | No | Yes |
| Free trial | No | No | Yes | No |
| Deployment | — | — | Cloud | — |
| API available | Unknown | Unknown | Unknown | Unknown |
| Platforms | — | — | ios, android, windows, macos | — |
| Certifications | — | — | — | — |
| Integrations | 1 | — | 4 | — |
| Company | — | — | — | — |
| Feature attributes | ||||
Also consider
Unknown values show as “Unknown”/“—”. Nothing is inferred — see each tool page for sources.