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SimpleHIIT vs Fitness Blender: catalog facts
SimpleHIIT	Fitness Blender
Free Free and open source under the GPL-3.0-or-later licence.	Freemium Free workouts with an account, plus a day pass or a paid Plus subscription.
Android	Web
Animated demonstrations for each exercise Eight exercise categories to choose from	Hundreds of full-length workout videos Programs with an interactive calendar
Android only Focused on HIIT rather than general workout logging	Much of the program content needs a paid membership The site promotes partner equipment offers
Downloadable app	Web application
Open source	Closed source
License: GPL-3.0-or-later	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 October 1, 2026

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