From Zero to $100K: How Two Friends Built a Viral AI App in 90 Days With TikTok

Let me tell you a story that had me shaking my head in disbelief.

A few weeks ago, I came across a tweet that said an app had hit 250,000 downloads and generated $100,000 in revenue in just three months.

Here’s how the revenue broke down:

• First month: $41K
• Second month: $32K
• Third month: $27K

And the wildest part? The whole thing was built by two friends working from their bedrooms in Europe, powered by nothing more than a single TikTok account.

Meet Nikita and Yini

The founders’ names are Nikita (based in Serbia) and Yini (based in Poland). Together, they built an AI app called Natural Write.

What does it do? Super simple. You paste in AI-generated text, hit a button, and get back “humanized” text that bypasses most AI detectors.

Their biggest audience turned out to be students and marketers — people who desperately needed content that wouldn’t get flagged.

And here’s the kicker: they didn’t dream this idea up in some big brainstorm session. They stumbled into it by spotting a trend.

They kept seeing videos about AI “humanizers” going viral on TikTok. So they thought: why not us? Let’s build one, and promote it the same way.

Two weeks later, they had a product ready to go.

Cracking TikTok

At first, they tried the obvious route — hiring influencers to make videos. It flopped. Views but no sales.

So they rolled up their sleeves and created their own TikTok account. They started filming short videos, posting daily, and within just a few posts, things snowballed.

Here’s the step-by-step TikTok playbook they shared:

1. Do niche research first — Search TikTok for competitors, make sure there are already viral videos in your space.
2. Set up your account the right way — If your audience is in the U.S., use a VPN, U.S. phone number, and fresh Apple ID.
3. Warm up the account — Spend a few days engaging with content in your niche (likes, comments, follows).
4. Copy what works — Start by recreating proven viral formats one-to-one. Always add captions.
5. Post consistently — One video per day at the best time for your audience.
6. Experiment later — Once you’re getting traction, then start innovating with your own ideas.
7. Scale — Create more accounts and bring in more creators when you’ve got momentum.

Their mantra was simple: don’t overcomplicate it, just replicate what’s already working.

Viral Hits That Paid Off

Their first breakout video was hilarious and relatable:

“You’ve got an essay due in five minutes.”

Cue a Jim Carrey clip… then the punchline — Natural Write as the instant solution.

That single video? 4 million views.

Another video showed a side-by-side demo: 100% AI text → hit the button → 100% human text.

The original format by another creator had 150K views.
Their copy? 1.5 million views.

Every time a video went viral, downloads spiked.

The Results

In just three months:

• 9 million TikTok views
• 300,000 site visits
• 250,000 signups
• 80% conversion from visit to signup
• $100,000 in revenue

And here’s the crazy part: their costs were tiny.

Their tech stack was lightweight: Next.js, Postgres, a $35/month server, a $20/month email tool, and a few bucks for VPNs and phone numbers.

Lessons From Their Journey

Looking back, Nikita and Yini shared two key lessons:

• Start TikTok yourself. Don’t outsource until you know what works.
• Don’t reinvent the wheel. Copy proven viral formats first, innovate later.

What makes their story so powerful is how accessible it is. No giant budget, no Silicon Valley connections, no polished English. Just two friends, an idea, and relentless TikTok consistency.

And the result? $100,000 in 90 days.

Final Thought

Stories like this are a reminder that opportunity doesn’t care about where you start.

Sometimes, all it takes is spotting a trend, acting fast, and hitting “post” on that first TikTok.

Because who knows? Your video might just be the one that gets 4 million views.