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RUNALYZE vs Polar Flow: catalog facts
RUNALYZE	Polar Flow
Freemium Free account available, with a paid Premium tier.	Free Free to use with Polar devices.
Web	Android, iOS, Web
Works with data from many device makers VO2max estimate and race predictions	Syncs data from Polar watches and heart-rate monitors Available on the web and on phones
Requires an account and upload of your data Some features are behind Premium	Only useful with Polar hardware Web service was under maintenance when checked
Hosted service	Downloadable app, Web application
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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