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One Chrome extension that automates the single repetitive click Poshmark sellers make hundreds of times a day, sold at a flat $30 a month by one person with no employees.
$30/month, unchanged since the day he started charging · first month $300 · solo, no employees · no ad spend
He never went looking for a market. He watched his wife spend an hour a night tapping a Share button, automated that one tap, charged $30 a month for it, and never raised the price.
Fewer bars = easier, cheaper, or faster for an AI-assisted solo builder. Editorial judgments based on the case details.
Jordan O'Connor is a solo developer in the United States who did not set out to sell software. His wife heard about Poshmark, the American secondhand fashion marketplace, through a friend and started selling clothes on it. Poshmark's mechanic is that listings only stay visible if the seller keeps sharing them into other members' feeds, so a closet holding thousands of items means pressing a Share button over and over, every single day. He watched her do it for an hour at a stretch and wrote a Chrome extension that pressed the button for her. He put the first version on his own blog for free. People started using it, so he attached a price: $30 a month. The first month produced $300 — ten subscriptions. The Korean analyst who assembled this case puts the current figure at $41,000 a month, roughly ₩58 million, with no employees and no outside money, and states that the $30 price has not moved since the day he started charging. Marketing is search and writing. He runs SEO consulting on the side and points that skill at his own product instead of buying ads. The shape of the thing is the lesson. Closet Tools shares on Poshmark and does nothing else: no other marketplaces, no wide feature surface, no dashboard ambitions. The analyst presents that narrowness as the reason it works rather than a limitation, because a tool that collapses a thirty-minute daily chore into five seconds is the one line item a working seller will not cancel. The sources named on screen are an Indie Hackers AMA and podcast interview with O'Connor, his own blog, and an outside round-up of Chrome extension revenue.
The first version went out free, on O'Connor's own blog, to readers who already had the problem. That is the entire acquisition story: no advertising was ever bought, and the channel that carried it is organic search plus his own writing, which he happens to be professionally good at.
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Data credibility: Third-party breakdown, not a founder interview. A Korean solo-business channel compiled four Chrome extension businesses and cites its sources on screen: an Indie Hackers AMA and podcast interview with Jordan O'Connor, O'Connor's own blog, and an outside round-up of Chrome extension revenue. The analyst states explicitly that three independent sources give the same figure, which is why we carry $41,000 a month and the $300 first month at all, but no dashboard, invoice or payment-processor screen appears in the video, so every number here is a founder claim relayed by an analyst and is unaudited. Won figures (₩58 million) are the video's own conversion, not ours. The customer count is our arithmetic from the revenue and the $30 price, not a stated figure. Nothing about the product's cost structure is stated for this business; the near-zero maintenance cost is described for a different extension in the same video and applied here as our own inference.
The first dollar came from flipping a free tool to paid after people were already using it. Month one at $30 produced $300, which is ten people deciding that an hour of clicking was worth thirty dollars.
Two loops compound here. The first is search.
The realistic clock on this pattern, in the analyst's own framing, is nine to twenty-four months of evenings before anything resembles income. CSS Scan needed nine months to reach its first milestone and another extension cited in the same breakdown took two years to reach $10,000 a month.
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