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C25K vs C2K: Couch to 5K & 10K: catalog facts
C25K	C2K: Couch to 5K & 10K
Freemium Free on iOS and Android with optional paid features.	Free Free and open source under the GPL-3.0 license.
Android, iOS	Android
Simple eight-week plan aimed at beginners Audio coaching during workouts	Includes several plans from beginner programs to 10K training Provides voice prompts and optional vibration cues
Focused only on reaching 5K Some features require payment	Android only Voice prompts require an installed text-to-speech engine
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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