21st Agents SDK vs Character.AI vs Convai vs Copy.ai
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| Attribute | ||||
|---|---|---|---|---|
| Category | Developer Tools | AI Agents & Assistants | AI Agents & Assistants | Content & Writing |
| Pricing | Paid | Free tier | Free tier | Freemium |
| Starting price | $6/month | $9.99/month | $5/month | $24 |
| Free tier | No | Yes | Yes | No |
| Free trial | No | No | Yes | Yes |
| Deployment | — | — | — | — |
| API available | Unknown | Unknown | Unknown | Yes |
| Platforms | — | — | — | — |
| Certifications | — | — | — | 1 |
| Integrations | 1 | — | — | — |
| Company | — | Founded 2022 | — | Founded 2020 |
| Feature attributes | ||||
| Sso Saml | — Unknown | — Unknown | — Unknown | ✓ Yes |
| Rbac | — Unknown | — Unknown | — Unknown | — Unknown |
| Mobile App | — Unknown | — Unknown | — Unknown | — Unknown |
| Webhooks | — Unknown | — Unknown | — Unknown | — Unknown |
| Data Export | — Unknown | — Unknown | — Unknown | — Unknown |
| Ai Generation | — Unknown | — Unknown | — Unknown | — Unknown |
| Grammar Check | — Unknown | — Unknown | — Unknown | — Unknown |
| Plagiarism Check | — Unknown | — Unknown | — Unknown | — Unknown |
| Brand Voice | — Unknown | — Unknown | — Unknown | ✓ Yes |
| Browser Extension | — Unknown | — Unknown | — Unknown | — Unknown |
Also consider
Unknown values show as “Unknown”/“—”. Nothing is inferred — see each tool page for sources.