| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | Yes |
| 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 · Developer Documentation Software | 8.7 (#5) | 7.9 (#15) |
| Publishing audience | both | Swimm describes its work as serving enterprise teams modernizing complex codebases, including mainframe and legacy systems. |
| Integrations | Listed integrations include PostHog, Google Analytics, Segment, Mixpanel, FullStory, Intercom, Postman, and Context7. | The integrations page lists VS Code, GitHub, JetBrains IDEs, GitLab, Bitbucket, Azure DevOps, GitHub Copilot, Backstage, Slack, Mermaid, Compass, and gitStream. |
| 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 it is SOC 2 and ISO 27001 compliant and says reports are available upon request. |
| Support | The Enterprise plan includes dedicated support and an uptime SLA. | Swimm lists dedicated enterprise support and implementation teams, and gives customers [email protected] for technical support questions. |
| What it does | Fern turns API definitions and Markdown into hosted documentation sites, SDKs, and command-line tools. | Its platform maps dependencies, data flows, and cross-repository relationships to create system understanding for modernization work. |