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Mobile apps›User acquisition

Test demand with ads before building the app (pre-sell)

Yuliya Lennox's rule — before vibe-coding an app, run marketing that sells a PDF, concept or promise (refunding if needed) to learn audience size, acquisition cost and willingness to pay; plus why founders must do early marketing themselves.

Updated 2026-10-24·1 source·user-acquisitionvalidationpaid-socialfounders

Test demand with ads before building

TL;DR (Yuliya Lennox, July 2026)

  • Start with marketing, not code: sell a PDF, an idea or a pre-order — and refund if there’s no product yet.1
  • What you learn: is the audience big enough, how expensive is a new user, can monetisation ever cover it?2
  • Her example: an aquarium-keepers app idea — marketing would show a small, expensive-to-reach audience; fine for a $20k/month side income, not for a VC-scale LTV:CAC.23
  • Don’t trust family and friends’ encouragement as validation.4
  • Founders should feel marketing first-hand — sit in acquisition meetings, think up early creatives. Eva Learn English (once #2 language app after Duolingo) had a founder in every marketing meeting.56

Details

Bootstrapping on paid is hard. David Barnard’s math in the same conversation: reaching ~$20k/month profit on traditional performance marketing might take $100–200k/month in spend and a full-time year where most revenue is reinvested; subscriptions only start cash-flowing in year two if retention holds.78

Practical version (derived): landing page or web quiz describing the outcome → small Meta budget against your target audience → measure CTR, cost per lead/checkout and actual pre-purchases → refund or deliver a simple version (PDF/plan).

Disagreements / caveats

  • Collecting money for a non-existent product needs clear disclosure and prompt refunds to stay within consumer law and platform policies.
  • Niche apps can still work via UGC, partnerships or ASO rather than paid (David’s pushback on the aquarium example).9

See also

Footnotes

  1. Make Ugly Ads to Grow Your App – Yuliya Lennox (Solid Starts) @ 09:06 — Yuliya Lennox ↩

  2. Make Ugly Ads to Grow Your App – Yuliya Lennox (Solid Starts) @ 09:55 — Yuliya Lennox ↩ ↩2

  3. Make Ugly Ads to Grow Your App – Yuliya Lennox (Solid Starts) @ 11:36 — Yuliya Lennox ↩

  4. Make Ugly Ads to Grow Your App – Yuliya Lennox (Solid Starts) @ 13:09 — Yuliya Lennox ↩

  5. Make Ugly Ads to Grow Your App – Yuliya Lennox (Solid Starts) @ 13:58 — Yuliya Lennox ↩

  6. Make Ugly Ads to Grow Your App – Yuliya Lennox (Solid Starts) @ 15:11 — Yuliya Lennox ↩

  7. Make Ugly Ads to Grow Your App – Yuliya Lennox (Solid Starts) @ 13:09 — David Barnard ↩

  8. Make Ugly Ads to Grow Your App – Yuliya Lennox (Solid Starts) @ 13:58 — David Barnard ↩

  9. Make Ugly Ads to Grow Your App – Yuliya Lennox (Solid Starts) @ 09:55 — David Barnard ↩