Solopreneur case studies
A solopreneur is someone who runs a business without hiring employees. Small Start records one-person and side-project businesses only: monthly revenue, profit, acquisition channels and hours invested, each with a source.
One-person businesses share a design: no fixed costs, automated support, and distribution that runs on search or a marketplace. Each case breaks that design down with numbers.
- Case studies
- 239
- Sale price
- 862.5億円
Solopreneur and side-business cases
1–24 of 239
VMagicMirror: ¥10M on BOOTH While Giving Away Nearly Every Feature for Free
VMagicMirror, a Windows app that puts a VRM avatar on your desktop, passed ¥10 million in cumulative BOOTH sales four years after launch — with nearly every feature included in the free edition. No ads, no social account, no analytics, and the developer kept his day job.
10Beasts: An 8-Article Amazon Affiliate Site Hit $80K/Month in 9 Months — Sold for $570K, Google Penalty 17 Days Later
Student Luqman Khan's Amazon affiliate site 10Beasts reached $80,000 a month in commissions with just 8 articles, nine months after launch. In December 2017 it sold for $570,000 via Empire Flippers — and 17 days after handover, a Google penalty struck. A case where timing the exit made all the difference.
Repsona: Five Years Solo, ¥12.4M Total Revenue — The Open Ledger of a Task-Management SaaS Its Maker Calls a "Startup Failure"
The developer of Japanese task-management SaaS Repsona published five years of numbers: total revenue of ¥12,403,567, 5,873 registered spaces, 14,641 cumulative users. Ads cost ¥500 per signup, but free-to-paid conversion was about 1%. A look inside his self-assessment: "a great success as a hobby, a big failure as a startup."
Bargaineering: From Cents a Day to a $3M Sale in Five Years
Launched in January 2005, US personal finance blog Bargaineering was earning "a few cents to maybe a dollar a day" at the six-month mark. Five years later, in 2010, it sold for $3 million. Founder Jim Wang has kept publishing the details himself — here is what the numbers say about the slow start and the eventual exit.
kan.kikuchi: ¥5,913,887 a Year from Solo-Built Joke VR Games — With the ¥420K Build Cost and 813 Hours All on the Record
A solo developer's VR games grossed ¥5,913,887 in their first year, netting ¥4,490,828 — more than 80% of it from a single title, Chupa Chupa VR. He published the build cost (¥420,544), the hours (813) and the refund rate (14.1%) too.
An Anonymous Solo Developer's ERP Integration SaaS: ~¥3M MRR with Zero Employees, Zero Ad Spend — and No Hand-Written Code for Six Months
A middleware SaaS that converts legacy ERP SOAP/XML interfaces into modern REST APIs reached roughly ¥3M in MRR with zero employees and zero ad spend, its operator disclosed on Zenn. For the past six months every line of code has been written by Claude Code. SEO posts targeting error messages drive acquisition. The operator is anonymous, so the figures cannot be externally verified.
280blocker: The Solo-Built Ad Blocker That Sold for ¥377M — 14x Its Operating Profit — When Its Developer Fell Ill
iOS ad blocker 280blocker was sold to listed company Tobila Systems for ¥377 million in August 2021. Its disclosed financials showed ¥38M revenue and ¥27M operating profit, putting the price at roughly 14x annual profit. The app had topped Japan's App Store paid rankings three years running — and changed hands when its solo developer fell ill.
PlentyOfFish: Sold for $575M in All Cash with Zero VC and 100% Ownership — 12 Years of the Man Who Coded a Dating Site Alone
Canadian dating site PlentyOfFish was sold to Match Group in 2015 for $575M in all cash. Founder Markus Frind ran it for 12 years with zero VC funding and 100% ownership. By his own account, in 2008 the site netted about $10M a year while he worked 10 hours a week. It had 75 employees at the time of sale.
Gadgeneko: Six Years, 356 Posts, 70K Monthly Pageviews and ¥60,000 a Month — Revenue Doubled After Surviving a Core Update and a Domain Change
The operator of Japanese gadget review blog Gadgeneko published a six-year report: 356 posts, about 70,000 monthly pageviews, roughly ¥60,000 a month (peaking near ¥130,000), with revenue about double the previous year. Annual check-ins record the October 2023 core update hit, the August 2024 domain change, and the recovery driven by Google Discover.
55% margins, a ¥35.3M price: the supplement subscription nobody bought at ¥80M
A supplement subscription EC business asked roughly ¥80M, found no buyer, and closed at ¥35.3M (about ¥40M including the 10% brokerage fee). Monthly operating profit was about ¥1.3M on a 55% margin, repeat rate 90%, zero complaints in five years. Of roughly ten deals the buyer approached, one survived.
Piroriro: Six Years of Whisky Blogging, ¥2,209,289 Total — a Full Disclosure of the Downhill from ¥73,421 to ¥7,975 a Month
The operator of whisky blog Piroriro published all six years of earnings: ¥2,209,289 in total (13,818 approved conversions), all via a single affiliate network. From a 2021 peak of ¥668,050 a year, income fell to ¥192,801 in 2024; best month ¥73,421, worst month ¥7,975. A rare record of the decline, not the climb.
Bankaholic: A 2-Year-Old One-Man Finance Blog Bankrate Bought for Up to $15M
In 2008, US finance blog Bankaholic sold to Bankrate for $12.4M upfront plus an earnout of up to $2.5M — up to $15M total. Owner Johns Wu was the sole owner and sole worker of a roughly two-year-old WordPress blog. The buyer's CEO cited organic search rankings for deposit and credit card keywords as the reason.
Keshilog: ¥1.5M a Month in the Telework Boom, Then a Deliberate ¥9.9M Landing — Three Years of a PC-Desk-Gear Blog
Keshilog, a Japanese blog specializing in PC desk peripherals, hit roughly ¥1.5 million a month in the spring-2020 telework boom — then deliberately slowed down to land under Japan's ¥10 million consumption-tax threshold. A three-year report that discloses the surge, the throttling, and the slump that followed.
Landlord Larry: 40 Rentals at 24, a $480 Payment and $1,400 Rent
Lawrence Guerguis, known online as Landlord Larry, grew to 40 single-family rentals in the American Midwest in three years. He has not published total rent or total cash flow. What is published is unit by unit: a property with a payment in the $480 range collected about $1,400 in Section 8 rent.
Podscan: $4,000 in the Red Every Month, Two Months After Declaring Profitability — Arvid Kahl's Second Act Is a Fight With GPU Bills
Podscan, the current venture of FeedbackPanda seller Arvid Kahl, transcribes 50,000 podcast episodes a day. One month in: $300 MRR against $2,000 in costs. Profitable after one year — then a big-customer churn flipped it to $6,000 MRR against $10,000 in expenses. He narrates the whole ride, weekly and in public.
Directify: $85,000 Buyout, MRR Fell 20% in Handover, $50K ARR Seven Months Later
Directify, a no-code directory-site builder, was sold to an individual buyer for $85,000 in February 2026 while doing $2,000 MRR. Keeping his nine-to-five, the buyer brought revenue back from the $1,600 it sank to during handover and reached $50K ARR in seven months. As of the six-month mark, roughly $70,000 of the purchase price was still unrecovered.
Kyoichi Anzai: Paid note Sales From ¥10,000/Month in Year One to ¥1M/Month in Year Three — the "Tenshoku Devil" Curve
Kyoichi Anzai, who publishes career-change know-how as "Tenshoku Devil," disclosed his note sales curve: ¥10,000/month in year one from his first paid article, ¥100,000/month in year two from a long-form paid article, past ¥1M/month in year three after launching a subscription magazine, then ¥1–2M every month. His book has sold over 30,000 copies.
Ruki: Selling a Personal Blog for ¥2.8M — a Seller's Full Walkthrough of a Brokered Site M&A in Japan
Most personal-blog sales in Japan never disclose price or process. In 2023, blogger Ruki sold her blog for ¥2.8 million through the brokerage Saitoma and published the entire journey: the appraisal form, interviews with three buyer candidates, the price negotiation, and the payout arriving the day after final inspection.
Typebot: Stuck at $100 MRR for 8 Months, Then Open Source and a Brazilian Tailwind Took the Solo SaaS to $623K a Year
Typebot, a chatbot builder run solo by French developer Baptiste Arnaud, made just $100 MRR in its first 8 months. A lifetime deal brought in $23K, an open-source rebuild reset the trajectory, and MRR went from $2.7K (Dec 2022) to $31K (Oct 2023). Estimated 2024 revenue: $623.1K.
Genji Reincarnation: 32 copies in month one, and a payout of zero
Usagijo spent about three years building the visual novel Genji Reincarnation and sold 32 copies on Steam in its first month, one of them refunded. Revenue never reached Steam's $100 payout threshold. Ten press pitches, 25,200 ad impressions and 24 activated review keys are all disclosed tactic by tactic.
Kokou no Tabibito: A Multi-Topic Blog Hitting 500K Monthly PV and ¥300,000/Month in About a Year
Yonesuke, who runs the fishing, outdoors and travel blog "Kokou no Tabibito," disclosed reaching 500,000 monthly pageviews and ¥300,000/month about one year after launch — roughly ¥0.6 per PV. His thesis: a general-interest blog can compete with niche blogs by exhaustively covering each category.
Pinboard: 11 years of revenue in one table, a $259K peak and three straight years of decline
Maciej Ceglowski publishes Pinboard revenue and active users in the same table every year. Revenue peaked at $259K in 2017 and stood at $212K in 2020, while active users fell from 29,000 to 19,000. Running the site costs about $17K a year, with zero funding and zero employees.
Take Me to Koshien: ¥12.9M in 11 months, and the ¥100 ticket that multiplied IAP revenue by ten
Yu Furuta, a solo developer in Nagoya, shipped a high school baseball manager sim in November 2017. By the end of September 2018 it had earned ¥12.9M in total, peaking at ¥2.57M in August. With 48,000 downloads and about 3,000 DAU, 76% of revenue came from in-app purchases. The turn came from a ¥100 draft ticket.
Gadgemaga: 594,562 Pageviews, ¥3,784,734 in a Month — The Ledger a Former Civil Servant Published Down to the Last Yen
In November 2020, Japanese gadget blog Gadgemaga logged 594,562 pageviews and ¥3,784,734 in revenue; its peak month was ¥5.08M in February 2021. The monthly reports, published to the yen, show how YouTube lifted the blog — and how fast it decayed.
FAQ
- What is a solopreneur?
- Someone who runs a business without employees. Unlike freelancing, which sells time, a solopreneur typically owns an asset — a product, an audience, a site — that keeps earning without their direct labour.
- How far can one person scale?
- Documented ceilings here include $7M+/year from an open-source paid tier, $74K MRR from a social scheduling tool, and $12.5M lifetime from digital courses — alongside cases that plateaued at a few thousand yen a month.