Swimm

Swimm is a code documentation platform founded in 2019 in Tel Aviv, Israel, that solves the chronic problem of documentation becoming out of date as codebases evolve. Traditional documentation lives in wikis or README files that have no connection to the code they describe, so when functions are renamed, files are moved, or logic changes, the documentation silently becomes incorrect without anyone noticing. Swimm addresses this by embedding documentation tokens directly into source code files, creating live coupling between explanatory content and the exact code snippets being described so that when code changes, the documentation highlights the divergence and prompts authors to update it. The platform integrates into GitHub and GitLab workflows through a CI check that flags stale documentation in pull requests before outdated content can reach production, treating docs as a first-class part of the code review process. Swimm also generates documentation from existing code using AI analysis to give teams a starting point for documenting legacy codebases. The company raised $34M in a Series B in 2022 and serves engineering teams at companies that want to accelerate onboarding for new engineers by ensuring that internal documentation accurately reflects the current state of complex systems.