How one developer built an $800K makeup app using TikTok

Executive overview

Most indie apps fail because they're built for the founder, not a proven audience. Louis validated demand on TikTok before writing a line of code, then shipped an MVP in days.

The result: 100K users in three days, two million total users, $800K in one year — all with zero paid marketing at launch.

Validate on TikTok first, build second.

Finding the idea

• Louis studied TikTok comment sections in the makeup niche to surface real, expressed demand.
• Comments revealed what users wanted — a way to find their best makeup look without buying products.
• He posted content around the idea before building the app; it went viral, confirming the market.
• The niche was signalled by hashtag volume: high view counts and frequent posting = open door.

The four-step TikTok playbook

1. Warm up a US-based account — new iPhone, US SIM or 24/7 US VPN, then spend 15–30 min/day scrolling and engaging in your niche for ~3 days to avoid bot flags.
2. Start posting — replicate a trend that works, layer your app concept on it, post once a day until you see traction, then scale to 4–6 times a day.
3. Add an anchor link — once a video hits a few thousand views (not before), attach a direct download link so users don't need to visit your bio.
4. Multiply accounts — run 2–3 accounts per phone; at peak Louis had 7 accounts posting 8–12 times a day.

The viral video mechanics

• One video hit 48M views and 2M likes, generating $12.5K in sales and 60K downloads in a single day.
• An in-app referral mechanic (invite 3 friends for a free look) drove users back to the comments to share codes, compounding engagement.
• Anchor link was added at ~500K views — timing was critical; adding it too early kills reach.

App and business model

• App: Glow Up — AI-generated makeup try-on for iOS and Android.
• Pricing: $9.99/week or $39.99/year.
• Scale: 2M users, ~70K paying customers, ~$15K MRR at time of interview.
• Onboarding is intentionally long to feel personalised; prompts a 5-star review before showing results.

Tech stack and costs

• Frontend: Flutterflow (Flutter-based no-code/low-code builder).
• Backend: Firebase, Google Cloud Functions.
• Payments: Superwall. Analytics: Mixpanel.
• Backend costs ~$1K/month; AI API ~$500/month; marketing can be $0 with organic content.
• Profit margins ~90%.

Key lessons

• Build for a market, not for yourself — study comments, not your own intuition.
• Ship an MVP fast once content validates demand; perfection kills momentum.
• You don't need domain expertise — makeup was not Louis' passion, just his market.
• Move first, adjust later; there is no perfect time to start.