Loading page…
A solo developer whose $14,000-a-month Twitter analytics extension was destroyed overnight by a platform price change, who sold it for $128,000 and rebuilt as several small products so no single host could do that to him again.
three products combined reported at $30,000+/month (May 2026 source) · Black Magic peaked at $14,000/month and sold to Hypefury for $128,000 in a single payment · products priced around $10–30/month · no employees, no office
Twitter repriced its API at $42,000 a month and his $14,000-a-month business was underwater the same day. He sold it for $128,000 and then built three products at once, so that no single platform could ever do that to him again.
Fewer bars = easier, cheaper, or faster for an AI-assisted solo builder. Editorial judgments based on the case details.
Tony Dinh is a solo developer from Vietnam. He was a senior engineer on a comfortable salary — one source calls it a safe six-figure job at a big tech company, the other puts it at ₩150 million a year — and he left it to ship small products in public, where the whole internet could watch him win or fail. The side project that worked first was Black Magic, a Twitter analytics browser extension. Two years took it to $14,000 a month. Then, in May 2023, Twitter repriced API access at $42,000 a month and the business was underwater immediately. He did not fight it. He sold Black Magic to Hypefury for $128,000, paid in one lump sum. What he did next is the reason this entry exists. Instead of replacing one product with one product, he built three at once: TypingMind, a faster and cleaner interface for AI chat aimed at people who live in it all day; DevUtils, a macOS utility belt for developers; and Xnapper, a macOS app that makes screenshots look good. The Korean analyst reports the three together at over $30,000 a month as of May 2026. Four months later, a second source reports TypingMind alone at over $130,000 a month, run with no employees, no office and no team, frequently from the road, and adds the detail that matters for credibility: he posts his exact numbers publicly, so anyone can check. The two figures cannot both describe the same moment, and we report both with their dates rather than picking one.
Building in public was the channel, and it was not a side activity. He shared his work on Twitter every day, which is how a Twitter analytics extension found its first users — the audience and the product occupied the same surface, so every progress post was a demo to exactly the people who would pay for it.
The quick-reference card — acquisition channels, replication playbook, and risk map — is members-only.
Join the Unicorn Club — $5/moCancel anytime, in one clickPaste into Claude Code / Codex and get a working version of this product end-to-end.
Two production-grade prompts per idea — a full build spec and an SEO growth plan — plus 10 tailored build specs a week. Members only.
Join the Unicorn Club — $5/moCancel anytime, in one clickEvery claim traces back to a listed source — open any of them and check the number yourself.
The full captured transcripts behind these sources are in the Unicorn Club — search them, quote them, check every figure. Join the Unicorn Club
Data credibility: Two independent creator breakdowns, neither a founder interview, and they disagree. A Korean solo-business channel (published May 2026) reports Black Magic peaking at $14,000/month, Twitter's API repricing at $42,000/month in May 2023, the sale to Hypefury at $128,000, and TypingMind, DevUtils and Xnapper together at over $30,000/month; it names Tony Dinh's own blog post about the sale and a Bootstrapped Founder interview as its sources. An English-language compilation (published September 2026) reports TypingMind alone at over $130,000/month and states that the founder publishes his exact numbers publicly, which is the only reason we carry a figure that far from the other. These two cannot both be current, and we deliberately report both with their dates instead of choosing. No dashboard, invoice or payment screen appears in either video. The second source's auto-caption renders the founder's name as 'Tony Den'; the correct spelling comes from the first video's own source list. The salary figure before founding is described differently by each source and we quote both. Nothing about stack, hosting costs or margins is stated anywhere; that section is explicitly our inference.
The first revenue came from a side project built while still employed, which is the structural detail worth copying. Black Magic took two years to reach $14,000 a month, and for most of that stretch the salary paid the bills and the product paid for nothing at all.
Three loops reinforce each other here. The first is the audience: building in public compounds, because every shipped feature is content and every piece of content grows the list that buys the next product.
The hard stretch here was not the beginning, it was the middle: two years to take Black Magic to $14,000 a month, and then the day the platform ended it. That second kind of silence — the business is working and then it simply is not — is the one nobody plans for.
The rest of this breakdown — 9 more sections — is in the Unicorn Club, with every section of all 1,012 ideas: first customers, first dollar, the flywheel, and the silent stretch.
Join the Unicorn Club — $5/moCancel anytime, in one click