Stainless vs Fern
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Stainless
The AI compiler that turns your OpenAPI spec into hand-crafted, produc...
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Fern
Input OpenAPI. Output production-ready SDKs and beautiful API docs — a...
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| RECATOOLS Score | 8.5 / 10 | 8.4 / 10 |
| Capability | ||
| Value for money | ||
| Ease of use | ||
| ASEAN readiness | ||
| API quality | ||
| Pricing | Freemium | Freemium |
| Free tier | Free plan: up to 5 SDK generators, 25 endpoints, 5 seats (pre-wind-down) | Hobby plan: free forever, 2 members, 250 AI credits, custom domain |
| Paid from | ~$250/month per SDK (Starter); enterprise custom from ~$30K/year (pre-wind-down) | Docs Team from $150/mo (annual saves ~25%); SDK generation priced separately; Enterprise custom |
| Has API | ✓ | ✓ |
| Open source | ✗ | ✓ |
| Free to use | ✓ | ✓ |
| Users | Hundreds of paying API companies; SDKs downloaded tens of millions of times/week | Used by companies including Square and Adobe; distributed via Postman post-acquisition |
| Founded | 2022 | 2022 |
| Maker | Anthropic (acquired May 2026) | Postman |
| Verdict | Stainless set the industry bar for AI-generated SDK quality, powering the official libraries for OpenAI, Anthropic, Meta, and Google — a trust signal almost no competitor can match. Its compiler approach (using a custom... |
Fern earns its strong scores on raw capability and code quality: independent reviewers consistently describe the generated SDKs as clean, idiomatic, and indistinguishable from hand-written libraries — an outcome that sav... |
| Full review → | Full review → |
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Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.