Solopreneur case studies — 3/11
Solopreneur and side-business cases
49–72 of 256
Ikeda Hayato: The Blogger Who Published His Full ¥4.05M Monthly Revenue Breakdown — Rereading the Origin of Japan's "Income Report" Culture
Ikeda Hayato of "Mada Tokyo de Shomo Shiteru no?" published the breakdown of his roughly ¥4.05M in January 2017 revenue (about ¥2M affiliate, ¥1.07M note sales, 2.18M pageviews) on note. A third-party compilation traces the arc from ¥40K a month in 2012 to ¥5.21M in February 2016. Rereading measured records of personal-blog economics.
Tenshoku Antenna: A One-Person Media Site, ¥700M Plus a ¥300M Earnout from Listed Company Logly
Tenshoku Antenna, a Japanese job-change media site run by moto (Shunsuke Totsuka) as a one-person company, became a 100% subsidiary of listed adtech firm Logly in April 2021. The founder disclosed the price himself: ¥700M plus an earnout of up to ¥300M. Negotiations took about six months, and his director compensation exceeded ¥100M a year — one of the largest disclosed exits for an individual-run media site in Japan.
Shichinatsu: A Salaried Designer's BOOTH Asset Shop Sells ¥1.08M in Six Months — Every Monthly Figure From ¥100K to ¥250K, Disclosed
Shichinatsu, a salaried designer, discloses every monthly sales figure from selling design assets on BOOTH. Revenue grew from ¥102,000 in July 2025 to ¥249,000 in October, totaling ¥1,083,410 over six months. A real month-by-month record of a side business built by productizing day-job skills.
Mirai Shokudo: A Jimbocho Diner That Published 4 Years of Books — ¥34,000 a Day, 23% Food Cost
Mirai Shokudo, the Tokyo set-meal diner opened in 2015 by Sekai Kobayashi, a former IBM and Cookpad engineer, has operated while publishing its full business plan and its monthly financials. It was profitable at ¥1.1M in monthly sales in 2016; October 2019 showed ¥709,000 in sales at a 23% food-cost ratio. No other restaurant's books are this visible.
textlint Maintainer azu: ¥2.29M a Year in OSS Sponsorships — textlint, JSer.info, and 14 Years of Continuity Built a Donation-Funded Solo Practice
azu, known for the proofreading tool textlint and the 14-year-running JSer.info, publishes his open-source finances every year. His 2025 GitHub Sponsors income was about ¥2.29M (¥160K–¥366K per month). A rare documented case of donation-only income reaching monthly-revenue levels without selling anything.
Ikameshi: ¥10M a Year Selling 3D Assets for VRChat — Six Years on BOOTH After Quitting the Day Job at ¥50,000 a Month
Ikameshi, who sells VRChat 3D assets on BOOTH, reached annual revenue of ¥10M in 2024 (¥4.46M in yearly BOOTH sales plus commissioned work). The threshold for going freelance was "¥50,000 a month." A metaverse-economy case whose numbers can be followed through the creator's own note series, from a cumulative ¥7M in 2023 onward.
Uneed: Running a Product Hunt Alternative Solo to $130K a Year — Inside the Books of "Marketing Over Building"
Uneed, a launch site run single-handedly by France's Thomas Sanlis, roughly quadrupled annual revenue from $35K in 2024 to $130K in 2025 — 45,000 new accounts and 7,500 launches in a year. The books are entirely public, from $66/month in running costs to an offline event held at a deliberate loss.
Sauna Ikitai: A Hobby Search Site Reaches ¥72.88M in Year-Two Revenue — Zero Employees and a ¥370/Month Subscription Capped at 10,000 Members
Sauna Ikitai, a sauna search site four enthusiasts started as a hobby, grew from about ¥14.01M in first-year revenue to about ¥72.88M with over ¥10M in net profit in year two, per reporting based on its statutory filings. No employees were hired, and the ¥370/month paid membership is capped at 10,000 members. The endpoint of turning a hobby into a business, read in numbers.
CyberLeads: After 19 Failed Projects, a "Freshly Funded Companies" Lead List Built in 31 Days Now Makes $53.7K/Month — with a Free Newsletter as the Sales Engine
Greek developer Alex West launched CyberLeads in February 2020 — his 20th project after 19 failures, built in 31 days. It sells monthly lists of freshly funded companies. From $290 MRR in month one to $53.7K/month by October 2024, with a free 10-lead weekly newsletter funneling buyers to the paid tiers.
SEObot: An AI That Writes SEO Articles Hits $46K MRR and $1.8M Lifetime — the Numbers Come from a Public Stripe-Linked Dashboard
John Rush's SEObot is a SaaS where AI keeps writing SEO articles. As of August 2026, its $46,517 MRR, $1.82M lifetime revenue, and 636 subscriptions are verifiable by anyone on a Stripe-connected public dashboard. Reading the numbers, AI-content controversy and all.
Feather: The "Write in Notion, Publish as a Blog" SaaS Sold for $250K Two Years In — the Buyer Was Tibo, Who Exited Tweet Hunter
Bhanu Teja P built Feather in public on X, reaching $50K ARR 9.5 months after launch. In June 2024 it sold for $250K at $6K MRR — roughly 3.5x annual revenue. The buyer was Tibo, known for exiting Tweet Hunter. A rare look at how peer-to-peer micro-M&A gets priced.
The God of Blog: 310K Pageviews Made ¥47K a Month, 6,499 Pageviews Made ¥53K — a 6-Year-2-Month Measured Record of Niche Selection
A One Piece analysis blog earned ¥46,801 on 310K monthly pageviews; the third blog, about blogging itself, earns ¥53,232 on 6,499. Per-pageview value of ¥0.15 versus ¥8.2 — Hebo published the full 6 years 2 months it took to reach ¥50K a month, failed sites' numbers included.
GummySearch: The Reddit Research SaaS That Chose to Close While Profitable — Four Years Ended by a Commercial API License That Never Came
After roughly four years running his Reddit research tool alone, founder Fed shut GummySearch down in November 2025 when commercial-license negotiations over the Data API fell through. Failory reported $35K MRR at closure. With 140,000 users and the business in the black, this was an ending caused by neither churn nor running out of money.
BoltAI: $15K a Month on One-Time Licenses in a Subscription-Only AI Market
Vietnamese solo developer Daniel Nguyen went against the "AI tools = subscriptions" consensus and sells BoltAI, a native macOS AI app, as a one-time license: an average of $15K a month and 7,000 customers 18 months after launch. He also documented the $19→$79 price climb and the year lost on his failed first product, KTool.
The Exit 8: A ¥470 Solo-Developed Game That Sold 30,000 Copies on Day One and 1.4 Million in Just Over a Year — How "Spot the Anomaly" Made Streaming Sell Copies
The Exit 8, a ¥470 walking simulator built alone by a former game-company employee, sold over 30,000 copies on launch day in November 2023 and passed 1.4 million worldwide by January 2025. It spawned the "8-like" genre, and its live-action film adaptation reached ¥5.17 billion at the box office.
Inkdrop: ¥150,000 a Month from a $4.99 Markdown Note App — Two Years of an Indie SaaS That Stopped PR Emails and Refused to Go Freemium
Japanese developer TAKUYA's Inkdrop reached ¥150,000 in monthly sales about two years after launch, with a ¥950,000 single-month spike in August 2019. A 1,000-person private beta, a 60-day free trial, no freemium, no more PR emails — the reasoning behind each decision is public, alongside the numbers.
ProjectionLab: $1M ARR from 4–6 Hours a Night, Every Weeknight, for 4 Years — the Growth Curve of a Financial-Planning SaaS Raised by the FIRE Community
ProjectionLab started at $150 MRR in 2021 and reached $1M ARR in June 2025. Developer Kyle Nolan quit his job only at $23K MRR. A Hacker News post, one word from Mr. Money Mustache, and an 8,500-member Discord were the main engines of growth.
Skeb: The "Personal Hobby Service" That Sold All Its Shares for ¥1 Billion — Settling the Risk of One Person Holding ¥200 Million a Month in Transactions
Skeb, which its founder called a "personal hobby service," reached 1 million registered users and roughly ¥200 million in monthly transaction volume in just over two years, then became a subsidiary of Jitsugyo no Nihon Sha in February 2021 for ¥1 billion. The top reason for selling was not stalled growth but payment-settlement risk.
Leadverse Gets All Its Customers From Reddit, and 90% of Its Costs Are LLM Fees — $3,300 MRR Built Between a Day Job and a Newborn
Leadverse, an AI tool that finds prospects on social media, reached $3,300 MRR and 130+ paying customers ten months after launch. Every dollar of revenue comes from Reddit, and LLM API fees make up about 90% of operating costs.
AI Directories: $10,000 a Month from One-Time Purchases, Built on a Chore He Automated
A service that submits AI products to 100+ directories by hand. Built for the founder's own use, it became the biggest earner in his portfolio, now at $10,000/month across products. But the three numbers he publishes — interview, pricing page, revenue page — don't match.
Questgen & Supermeme Today: 2.5 Million Signups, $6,500–7,000 a Month — Three AI Tools Down From a $100K Peak Year
Three AI tools run by a data scientist alongside his day job. Combined signups exceed 2.5 million, yet current monthly revenue is $6,500–7,000 — down from the 2025 peak of $100K a year.
Abbey Road: He Sold His Own Assets to Take Over a 20-Year Rakuten Watchband Store
Katsuhito Saiki, who worked at a seafood trading company, took over "Abbey Road," a watchband shop that had run for 20+ years on Rakuten Market. He'd once passed on the listing because it exceeded his budget, but returned to it; when a loan from the Japan Finance Corporation was rejected, he sold off his own assets to raise funds. Negotiations spanned about 1 year and 8 months.
Is a coin laundry passive income? ¥150,000-500,000 a month, 7-10 year payback — an owner's numbers
A current owner running a coin laundry as a side business published their income statement: initial investment of ¥13-22 million, monthly revenue of ¥150,000-500,000, fixed costs of ¥250,000-530,000, take-home of a few tens of thousands to over ¥100,000 per month, with a 7-10 year payback period. We examine content in which the operator personally dismantles the "passive income" image.
manablog at ¥1,000,000–1,500,000/month, and two sites left idle 3–4 years before closing — the numbers Manabu published under his real name
manablog earns ¥1,000,000–1,500,000/month at 500,000 PV, with one article alone worth roughly ¥500,000/month, while two other sites earning ¥100,000–150,000/month closed after 3–4 years of neglect.