About
One app-growth specialist who crosses product and marketing.
Stefan Papst — mobile app growth consultant from Austria, currently based in Budapest. Operator background: co-founded and scaled a portfolio of B2C subscription apps before consulting full-time.
The angle
The missing middle
Most founders get either a generalist freelancer or an enterprise agency. Tap Convert is the missing middle — one app-specialist partner who crosses product and marketing, and who has run real paid UA and product experiments with their own money.
The method belief
Economics before bids
Paid UA without unit-economics validation is a predictable path to overspend. Start with ARPU, LTV and free-to-paid, set the CPA ceiling, then acquire. Fix attribution before touching bids.
In one line
"I've run real paid UA and product experiments with my own money — so I optimise your app the way I'd optimise mine: starting from the numbers."
The company
Tap Convert Kft.
Registered in Budapest, Hungary
- Founder & MD
- Stefan Papst
- Company reg.
- 01 09 454140
- VAT (EU)
- HU33008471
- D-U-N-S
- 30-233-4583
The path here
From computer science to app growth.
- 01
Foundation
MSc — CS & Business
Computer Science & Business Management. The engineering to build, the business lens to grow.
- 02
Co-founder
Fasky Agency
Co-founded a software company — learning to ship and run real products end to end.
- 03
Operator
Fasky Software
Built & scaled a portfolio of B2C subscription apps with my own capital.
- 04
Today
Tap Convert
Fully focused on subscription web & app growth for founders.
Work with me
One accountable partner for your app's growth.
Book a discovery call, or send a short intake and get a personalised video response.