21st Agents SDK vs AI21 Labs vs Claude vs OpenAI Platform
| Attribute | ||||
|---|---|---|---|---|
| Category | Developer Tools | AI & Automation | AI Agents & Assistants | API Management |
| Pricing | Paid | Free tier | Free tier | Paid |
| Starting price | $6/month | — | $20/month | $0.15/month |
| Free tier | No | Yes | Yes | No |
| Free trial | No | Yes | No | No |
| Deployment | — | — | Cloud | — |
| API available | Unknown | Unknown | Unknown | Unknown |
| Platforms | — | — | ios, android, macos | — |
| Certifications | — | — | — | — |
| Integrations | 1 | — | 2 | — |
| Company | — | Founded 2017 | — | — |
| Feature attributes | ||||
Also consider
Unknown values show as “Unknown”/“—”. Nothing is inferred — see each tool page for sources.