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A browser extension that replaces the open-devtools-inspect-copy-clean ritual with a single click, sold as a one-time purchase or $20 a month to developers in 116 countries.
$60,000 of that arriving in a second nine-month stretch · one-time purchase or $20/month · users across 116 countries · solo, no employees
Copying one element's styles out of somebody else's site took two or three minutes of devtools archaeology. He made it one click, charged twenty dollars, and passed $100,000 without a degree, a team, or a fixed address.
Fewer bars = easier, cheaper, or faster for an AI-assisted solo builder. Editorial judgments based on the case details.
Guilherme Rizzo is a self-taught developer in Brazil. He never went to university; he learned to code from books. The annoyance that became his business was one he hit constantly while building websites: to see how another site styled an element, you open developer tools, click through the element tree, copy the rules, then clean up the mess by hand. Two or three minutes, every time, for something you need dozens of times a week. CSS Scan collapses that into a single click. Hover an element, click, and its styles are on your clipboard, already tidy. The pricing is a one-time purchase or $20 a month. The revenue arrived in two roughly equal-length stretches. The video describes a first milestone reached after nine months, then $60,000 over the following nine months, with cumulative revenue passing $100,000 — the Korean analyst converts that to ₩140 million. The first milestone figure is garbled in the auto-caption and we do not reproduce it. Usage is given as 116 countries; the user count is also garbled mid-sentence, though the analyst's punchline survives intact: a few thousand paying developers is enough, and you do not need a million. What he did with the money is part of why the case travels. He worked from Brazil, Mexico, Europe and Asia while the product ran, carrying one laptop. The source named on screen is Rizzo's own revenue post on Indie Hackers.
The channel that carried CSS Scan was writing in public. Rizzo made the product known through Indie Hackers, where publishing your actual numbers is the price of attention and the numbers themselves are the marketing.
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Data credibility: Third-party breakdown rather than a founder interview. A Korean solo-business channel compiled four Chrome extension businesses and names its source for this one on screen: Guilherme Rizzo's own revenue post on Indie Hackers. No dashboard or payment screen appears in the video, so the figures are founder claims relayed by an analyst, unaudited. Two numbers in the source are garbled in the auto-captions and we deliberately omit them: the amount attached to the first nine-month milestone is transcribed as an impossible figure that contradicts the stated cumulative total, and the user count is cut off mid-word in both places it appears — we therefore report only 116 countries and the analyst's surviving point that a few thousand users suffices. The ₩140 million conversion is the video's own. The founder's background (self-taught, no university, working from Brazil, Mexico, Europe and Asia) is the analyst's description. Nothing about infrastructure, costs or margins is stated for this business; that section is explicitly our inference.
The first dollar came from a purchase, not a subscription, and that distinction shapes the whole business. CSS Scan sells a one-time licence alongside a $20 monthly option, which means the first sale can close in the same minute a developer first sees the demo, with no trial period and no decision to revisit later.
The compounding here came from publishing the numbers. Every revenue update Rizzo posted was both a progress report and a distribution event, because an indie community rewards transparency with attention, and attention at that scale converts into sales for a $20 tool.
Nine months to a first milestone is the number to internalise, and the same video sets the wider benchmark at nine to twenty-four months, citing another extension that took two full years to reach $10,000 a month. Nothing about that period feels like progress while you are inside it.
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