Show HN: My workout tracker app made $20 in first week (justlog.app)

Just curious how these lines work out,

"People who log workouts are 2x more likely to stick to their routine and make gains, No social feeds, no distractions, just results. $1.99/month vs $9.99 competitors."

For me it would be a no-go, just from the 2x (unfounded?!) affirmation and how this is cheaper that (all?!) of the competitors. Do people actually like this kind of motivationals, so to speak?

Concrats! :)