Yim Yoon-seok, a pharmacist who also competes as a bodybuilder, spent eight weeks building a fitness tracking app called Alyak Coach. Within two months of its launch, the app had pulled in 3,900 users and generated $4,500 in revenue.
From pharmacy counter to workout algorithm
Yim developed Alyak Coach in his spare time, combining his professional knowledge of medications and supplements with his personal experience in competitive bodybuilding. The app adapts its training plans based on user progress, though Yim hasn't disclosed the specific algorithms driving those adjustments.
Early traction with a lean budget
The app's user base grew organically. No marketing spend was reported. At 3,900 users and $4,500 in revenue over two months, the average revenue per user sits at roughly $1.15. That's modest, but for a solo developer working nights and weekends, the numbers show early proof of concept.
Why a pharmacist built a fitness app
Yim sees a gap between general fitness coaching and the physiological realities of training under medication or supplementation. As a pharmacist, he notices athletes often follow generic plans that ignore drug interactions or recovery needs. Alyak Coach is meant to close that gap — though the app's current features aren't detailed in public materials.
The eight-week development sprint suggests Yim prioritized speed to market over a feature-heavy v1.0. That approach paid off in initial user acquisition, but the real test will come as users finish their first training cycles and decide whether to stick with the app.
Yim hasn't announced a funding round or a hiring plan. For now, he's still behind the counter at the pharmacy and at the gym — and behind the code of Alyak Coach.
