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

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