| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | Yes | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 2 | 1 |
| Spec score · AI Documentation Generators | 8.7 (#8) | 6.8 (#28) |
| Documentation | Fern Docs builds interactive documentation websites from Markdown and API specifications. | Swimm describes auto-generated documentation and visualizations of flows with detailed explanations as product capabilities. |
| Integrations | Listed integrations include PostHog, Google Analytics, Segment, Mixpanel, FullStory, Intercom, Postman, and Context7. | Swimm’s current site names Copilot, Cursor, Claude Code, internal agents, and MCP servers as tools its knowledge base can support. |
| Security | Fern's trust center lists SOC 2 Type II, GDPR, and CCPA and provides access requests for its SOC 2 report, penetration test summary, and information security policy. | Swimm states that it is SOC 2 and ISO 27001 compliant, with reports available upon request. |
| What it does | Fern turns API definitions and Markdown into hosted documentation sites, SDKs, and command-line tools. | Swimm combines deterministic code analysis, AI, and subject-matter experts to help teams understand and modernize codebases. |