arc vs caliber
the short answer.
caliber is a science-first strength app with a free tier, paid plans, and optional one-to-one human coaching. arc is free and built for the part before all that: telling you what to do and walking you through it, set by set.
feature comparison.
why arc.
caliber is one of the more honest apps in this category and its free tier is real. the difference is scope: caliber wants to coach your training, your eating, and your habits at once, which is a lot to take on in week one. arc does one thing, gets you lifting a program made for you, and walks you through every set until the gym stops feeling like a test.
how caliber differs.
caliber combines resistance training, cardio, nutrition, and habit formation in one app, grounded in a visible coaching methodology. you can build and track workouts free, pay from about $9/mo for coach-designed plans, or add one-to-one coaching with a certified trainer on top.
the bottom line.
if you want training and nutrition coached together and you'll use the whole system, caliber is a strong pick. if you just want to walk into the gym knowing exactly what to do, start with arc.