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Cairn vs RunGap: catalog facts
Cairn	RunGap
Free Free and open source under the MIT licence.	Freemium Free to download with paid features.
Android	iOS
Exports to an open standard format, Open mHealth JSON Data goes only to your own Nextcloud	Connects to around 50 fitness services and devices Exports and backs up workouts
Requires a Nextcloud server Very new project with few users	iPhone and iPad only Closed source
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.