4 Hobby Apps Earning $50K+ Per Month

Someone on Reddit rounded up apps launched in the past year, each built for one hobby.

I ran them through SensorTower, which estimates monthly revenue for apps 👇

• HeyRua (learn Irish by speaking it): $150K–$600K across iPhone and Android
• Pitch Trainer (ear training for musicians): $100K–$500K
• Family Tree Maker & Ancestry: $50K–$100K
• SlowRead (a bookshelf and reading tracker): $50K–$100K

Pitch Trainer stood out, because the ear training apps it competes with are rated just as well and earn far less…

• Pitch Trainer (4.7 stars): $100K–$500K
• Functional Ear Trainer (4.9 stars): $5K–$50K
• Earpeggio (4.9 stars): under $5K

Same hobby, similar ratings, very different money 🤯

The big difference looks like the business model.

Functional Ear Trainer charges a one-time $19.99 and doesn’t run ads, according to SensorTower.

Pitch Trainer puts every training mode behind a subscription, sells weekly plans from $2.99 to $7.99 alongside yearly ones, and pays for ads to keep new users coming in.

SlowRead and Family Tree Maker run the same playbook, with weekly plans and active ads.

So in these niches the money seems to follow the pricing and the marketing, not the star rating.

SensorTower shows each app’s estimated revenue, its prices and whether it’s advertising, all free and without an account.

Pick a hobby you know well, look up its top apps there, and build your own around whichever business model is earning the most 💪

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