Everyone asked him for Excel help. He wrapped GPT in a no-code app — now it makes $200,000 a month.

formulabot.com

$200,000 a month from a tool that writes Excel formulas. David Bressler built it in six weeks, on no-code, during paternity leave — and he'd never shipped a line of production code.

The pain had been sitting in his inbox for fifteen years. David spent a decade and a half as a data analyst, and the same thing kept happening on every team he joined: colleagues would message him asking how to write some nested IF or VLOOKUP. He was the human formula generator for everyone around him.

In July 2022, on paternity leave with his second child, he finally built the thing that replaced him. GPT-3 had just made plain-English-to-code translation trivial. He wrapped it: type "sum column B where column A is paid", get the exact Excel formula back. He even asked GPT to name it — it suggested "Excel Formula Bot."

He didn't know how to code. He built the entire front and back end on Bubble, the no-code platform, learning from YouTube tutorials, with Stripe wired in for payments. Six weeks, start to finish. Then he posted it to Reddit — and woke up the next morning to 100,000 people on his site overnight, plus a surprise $4,000+ OpenAI bill from all the free usage. That spike was the launch. First three months: $30,000 in revenue.

He didn't build an AI company. He wrapped a model around a question people had been asking him for fifteen years.

He kept his day job for exactly one more year before going full-time. "Excel Formula Bot" became "Formula Bot" — a full AI data-analysis platform that does far more than formulas. Today it has 750,000+ users, roughly 5,000 paying, and clears north of $200,000 a month. Solo. No code. No funding.

1. Solved a pain he'd personally fielded for 15 years. He wasn't guessing at demand — he'd been the manual version of the product for a decade and a half.
2. Launched on Reddit, not a landing page. One post in the right subreddit put 100,000 people on the site overnight. The audience was already gathered; he just showed up with the answer.
3. Let the free tier do the marketing. Anyone could try it instantly. The viral usage — and the painful API bill — was proof the demand was real before he'd spent a dollar on ads.
4. Rode SEO after the spike. "How do I write an Excel formula for X" is one of the most-searched things on the internet. The product was the answer to the query.
5. Expanded the wedge. Once the formula tool had the audience, he broadened it into a full data-analysis platform — raising the price ceiling without changing the customer.

1. Your inbox is a product spec. The thing people keep asking you to do manually is the thing they'll pay software to do. David's customers were every coworker who ever pinged him for a formula.
2. No-code plus an API is a real business. You don't need to write production code to ship an AI product. A clean wrapper around a real pain beats elegant engineering around a fake one.
3. Distribution can be a single great post. He didn't run a campaign. He posted once, to the right community, with something genuinely useful — and that was the launch.

Revenue figures tagged self-reported come directly from the founder's public posts or interviews — we don't audit them. Our purpose is to share success stories with enough online proof to be worth your attention, not to certify the numbers.