21st Agents SDK vs Backstage vs Cortex
| Attribute | |||
|---|---|---|---|
| Category | Developer Tools | Developer Tools | No-Code & Low-Code |
| Pricing | Paid | Free tier | Paid |
| Starting price | $6/month | — | — |
| Free tier | No | Yes | No |
| Free trial | No | Unknown | No |
| Deployment | — | — | — |
| API available | Unknown | Unknown | Unknown |
| Platforms | — | — | — |
| Certifications | — | — | — |
| Integrations | 1 | 3 | — |
| Company | — | — | — |
| Feature attributes | |||
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Unknown values show as “Unknown”/“—”. Nothing is inferred — see each tool page for sources.