A self-improvement app that keeps growing its user base without ads: ~1,800 new users a month, all organic, 10K+ downloads on Google Play and 4.7★ from 500+ reviews. Users rate their life areas, see what's out of balance on a visual wheel, add action steps and track progress over time. Coaches and therapists use it with clients. Lots of upside left: paid ads were never tried and the monthly plan is only $1.99. iOS + Android, profitable, easy to run.