During the early stages of Swimm’s product, all content was stored as .swm files in your repository. Swm files were in JSON format, and though it was easier for computers to read, it was neither readable as text nor rendered in editors, it was not user-friendly, changes were hard to review, and editing was harder due to JSON’s fragile curly bracket format. Swm Format In short, swm was not working out. Swimm did not want to begin dealing with yet another proprietary format. We felt it was much better to focus on using known readable file standards that require very little to no explanation at all. In August of 2021, Swimm switched to sw.md Markdown and there’s no going back. It was an easy move, plus there was precedent for extending Markdown with new functionality by adding new markup.