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A solo-built tool that runs an X account on autopilot — ¥3M a month in its first month, sold almost entirely off one launch post that did 13.5 million impressions
broke ¥3M in sales within the first month of launch · roughly half of users are companies · zero ad spend, zero paid marketing · waitlist of 760+ (founder believes over 1,000 across lists) · founder's own X payouts around $200 per two weeks, up to ~$800 per two weeks when actively pushing
He never optimised the landing page, never did SEO, and admits he has done maybe 1% of the growth work available — the entire business came from selling an X automation tool on X, where one post about it stacked up 13.5 million impressions.
Fewer bars = easier, cheaper, or faster for an AI-assisted solo builder. Editorial judgments based on the case details.
The founder had been posting on X for about two years when he realised roughly a year in that most of the work could be automated. His stated motivation is unusual and worth quoting because it shapes the whole product: he did not want to open the official app, because the timeline is engineered to be unputdownable. "If you consume too much digital information, if your body absorbs too much of it, not many good things happen." So he built himself a way to publish without reading. The first version was the most primitive thing possible — hitting the API from the command line to post. Then he built a small private SaaS for himself and ran it for a while. Running it produced data analysis, an understanding of what actually goes viral, and eventually an automatic video-editing feature. At that point the obvious thought arrived: other people should be able to use this. The timeline is tight. The idea landed around November. Serious development started in December. A closed release went out in January to a hand-picked group. And the number he gives for that first month is that sales cleared ¥3,000,000 — with the qualifier that this is a bootstrapped company that did no marketing at all: "if a service I built myself as an individual brings in ¥3 million every month, I think that's fine." He is also honest that the composition surprised him. "When you open the lid, there are unexpectedly many corporate users. About half are companies using XBoost to run their social media." The individual half are people trying to become influencers or build attention around AI content — accounts being warmed up so they can be pointed at any business later.
The list existed before the product did. While building, he ran a waitlist as a plain Google Form — deliberately a Google Form, because people are used to them and long custom forms kill completion — with three required fields: X user ID, email address, and free text on why you want to use XBoost.
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Data credibility: Founder-reported in a Japanese-language screen-share video. The product interface, waitlist spreadsheet, Google Search Console, X analytics and the Stripe dashboard are all shown on screen, but no revenue figure is ever displayed — the ¥3,000,000-a-month number is stated verbally only, twice ('sales alone broke ¥3 million' and 'a service I built myself brings in ¥3 million every month'). Figures kept in the original currency because the transcript never converts: ¥3M/mo revenue, ~¥1.6M of free Cursor credits, ~¥200,000-1,000,000/month as the going rate for outsourced Japanese X account management, and his projection of ¥200,000-300,000/day if he did the growth work he has not done. The email tool (Resend) is priced in dollars at about $60/mo. The X creator-payout figures are internally inconsistent and we are not smoothing them: he says roughly $200 per two weeks on average and about $800 per two weeks when pushing, then states a monthly yen figure the auto-captions render as '230万' (¥2.3M) which cannot be reconciled with $800 per fortnight and is most likely '23万' (¥230,000) mis-transcribed. Treat the payout figure as approximately $200-800 per two weeks and ignore the yen rendering. Other self-reported metrics: ~30,000 X followers, 10,000 followers gained in one month at peak, a launch post at 13.56 million impressions, 760+ waitlist entries, roughly half of customers being companies, 12 email templates, and a Threads post at over 1M impressions with 4,000 likes, 268 reposts and 35 quotes. Region is Japan: he is Japanese-speaking, discusses Japanese landing-page conventions, LINE, Kakao-equivalent Japanese platforms, A8.net and Japanese agency pricing, states his base is currently Japan, and mentions previously running a startup in San Francisco and an upcoming month-long work trip there. The TestSprite segment is disclosed by the founder as a paid request. The exact product name is rendered variously in the auto-captions as XBoost, Xブースト, XOT and XBoost.now; the domain he states is xboost.now.
Serious development started in December and a closed release went out in January, with access opened in batches to the hand-picked waitlist rows. Sales cleared ¥3,000,000 in that first month, on a bootstrapped product carrying no advertising at all.
The loop here is that the tool's own subject matter is its distribution. He never optimised the landing page, which is unchanged from the prototype and which he calls genuinely bad, because "if I seriously wanted to acquire customers, for a tool for running X, acquiring customers on X is the logical route."
He is explicit about why the waitlist exists, and the reasoning is survival rather than marketing. Development takes one to three months during which nothing is being acquired, so a launch with no list starts at zero users, and "if it stays like that for about a month you decide the idea was bad and quit."
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