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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.
CSS Scan is a browser extension that puts an element's styles on your clipboard in one click. Hover, click, done — no inspector panel, no expanding the computed styles tree, no deleting the browser's noise by hand afterwards. The video frames it as a two-to-three-minute task compressed to one action, performed dozens of times a week by anyone who builds interfaces. The scope is aggressively narrow, which is the analyst's central point across all four businesses in this video. CSS Scan copies CSS. It does not lint, does not convert to a framework, does not manage a design system, does not try to become a general-purpose developer suite. His argument is that a tool doing one thing to completion is loved by exactly the people who do that thing, while a tool doing five things belongs to nobody. The secondary insight is about audience size. The video's takeaway is that a few thousand paying developers across 116 countries is a complete business for one person — the exact user figure is garbled in the caption, but the point being made is that a million users was never the target and was never needed.
Two options, both small: a one-time purchase or $20 a month. That pairing is unusual and deliberate. The one-time licence converts the impulse buyer at the moment of frustration and never has to be defended again; the subscription catches teams and people who prefer expensing a monthly line. The cumulative figures tell the story of how this compounds. Over $100,000 total, with $60,000 of it landing in a single nine-month window after a much slower first nine months. For a one-time-purchase product that shape matters: cumulative revenue is the only meaningful metric, because there is no recurring base to stand on and each month starts from zero demand. Our read: the one-time licence is the reason this business is calm and also the reason it has a ceiling. There is no expansion revenue, no seat growth, no natural price escalator — growth is entirely a function of new buyers found, forever. At $20 a sale that means roughly five thousand purchases to reach $100,000, which is achievable for a tool with a fifteen-second demo and brutal for anything requiring explanation. Pick the one-time model only when the demo does the selling.
The video gives no technical detail for CSS Scan, but it establishes the category's cost floor using the newest of its four cases: Easy Folders, the ChatGPT folder extension, runs at effectively zero maintenance cost — one email service, no staff. Our read: CSS Scan is cheaper still to operate than a marketplace automation tool. Everything happens locally in the user's browser against the page already loaded on their screen. There is no API to call, no data to store, no per-user compute at all. The operating bill is a static marketing site, a payments processor, a licence-key endpoint and a mailbox. Against six figures of cumulative revenue, the margin is effectively the payment processor's cut and the founder's time. That cost structure is precisely what makes the travelling work. A business with no servers to babysit and no support queue driven by outages can be run from Mexico City or Lisbon with a laptop, which is what the video reports Rizzo doing. The real expense is browser compatibility maintenance: Chrome ships changes to extension APIs on its own schedule, and Manifest V3 migrations have already forced every extension author through an unpaid rewrite at least once.
Copy the problem-finding method. Rizzo did not research a market; he automated a two-minute ritual he personally performed several times a day. The analyst's summary across all four founders is that none of them started by asking what to build, and all of them started from something that annoyed them or someone in their house. His instruction to viewers is to note down one moment today when a computer made them angry, and treat that note as the starting asset. Copy the credential-free framing too. No degree, no employer, no team, no office — and none of it mattered, because a developer evaluating a $20 clipboard utility never asks who built it. Change the monetisation mix. A pure one-time licence means permanent customer acquisition pressure; adding a modest recurring component — a team plan, a hosted snippet library, an update subscription — gives the business a floor that does not reset every month. Also change the distribution assumption: Indie Hackers was a genuine discovery channel when this took off, and any single community's ability to launch a product decays as it gets crowded. Our read: in 2026 the build is a weekend and the competition includes free extensions and increasingly capable browser devtools. What still transfers is the discipline — one action, one click, one price, shipped as a demo rather than a pitch.
The browser is both the platform and the competitor. Chrome's own devtools have steadily absorbed convenience features, and anything the inspector learns to do natively erases part of the reason to pay. Extension platform changes are the sharper version of the same risk: Manifest migrations have forced rewrites, and a policy change or store delisting removes distribution instantly and for everyone. Competition is structurally brutal for a tool this simple. A one-click CSS copier is a weekend build, free clones exist, and there is no defensible technology — only the brand, the search position and the trust accumulated by shipping for years. The same video's wider warning applies here: the analyst notes that seventy percent of people who spent a year building a SaaS earn almost nothing from it, and the difference is rarely the code. The one-time licence adds its own exposure. Cumulative revenue with no recurring base means a quiet quarter is a quiet quarter, with nothing underneath it, and a founder who stops marketing stops earning. Our read: the deepest risk is that AI coding assistants make the underlying task disappear rather than merely automate it. Developers who ask a model to reproduce a component's styling never open the inspector at all. That does not end the business tomorrow, but it caps it, and it is the reason to treat a tool like this as one product among several rather than a career.
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