Solopreneur case studies — 6/9
Solopreneur and side-business cases
121–144 of 201
A 300-article general-interest blog crosses ¥1M/month — the numbers Unicoblog put in the bank in 1 year 3 months, and the AdSense it abandoned
Reona Kobayashi's "Unicoblog," launched Jan 2020, hit 300 articles by April 2021 and started clearing over ¥1M/month by bank transfer, while AdSense revenue fell from ¥100K to ¥10K/month.
HeadshotPro: $100K ARR in 14 Days, Then Up to $300K MRR — Examining the AI Headshot Business
HeadshotPro, an AI headshot service built by Dutch developer Danny Postma, hit $100K ARR just 14 days after launching in March 2023, and has since climbed to $300K MRR ($3.6M ARR). 14 million photos generated, 190,000 customers. The acquisition-channel numbers are public too — over $50K a month from affiliates alone.
Taking over a grilled-fish specialty restaurant via M&A — one month of handover, six months chasing the floor, and the lunch sales that finally moved
A restaurant company running a dozen-plus outlets divested a Tokyo grilled-fish specialty restaurant as part of "selection and concentration"; an experienced individual took it over in January 2024. Sales matched the financial statements from day one, but the one-month handover and insufficient equipment checks turned out to be miscalculations.
A 50-something engineer used his severance pay to buy 40+ vending machines: registered in January 2024, took over in August, targeting double the sales
Tsuneyuki Inoue, a 50-something manufacturing engineer in Yamagata, acquired a 40+ machine vending operation from Norikichi Honten in Niigata. He registered on an M&A site in January 2024, met in June, trained in July, and took over formally in August, funding it with his severance pay and aiming to double sales in two years. The transfer price wasn't disclosed.
Substack Writers at Work: Zero New Subscribers for 2 Years, Then 2,000 in 6 Months — Selling How to Teach Substack, at $200,000+ a Year
Bestselling author Sarah Fay's first newsletter went 2 years with zero new subscribers. One phone call turned that into 2,000 subscribers in 6 months, and she split that method into a 3-tier subscription, reaching over $200,000 (about ¥30 million) a year.
Lea, a Tool That Turns LINE Official Accounts Into E-Commerce Stores, Sold to a Buyer Found Through an Online Salon
Lea, an indie SaaS providing e-commerce features on top of LINE official accounts, was sold to INFLU Inc. in July 2022 (price undisclosed). The buyer was found through a paid online salon — a record of an unusual route: "walk into the place where the market is booming yourself."
¥10 Million in Cumulative Sales on Coconala Over 4 Years: A Video Creator's Pricing Strategy That Started with a ¥780 First Order
Video creator Matsuume Take started on Coconala in March 2021; his first order was a narration read-through netting ¥780. Over 4 years he reached ¥10 million in cumulative sales (just under ¥12 million as of November 2025). The turning points: specializing in video production and switching strategy from "more orders" to "higher prices."
Fully Booked VA: Selling an $180K/Year Course Business With No Down Payment — the Seller-Financing Record of 36 Monthly Installments of $5,000
Fully Booked VA, a virtual-assistant training course business with over 10,000 lifetime students, sold for $180,000 to business coach Stephanie Hayes when monthly revenue stood at about $15K. Payment was fully seller-financed: $5,000/month for 36 installments plus interest. This is the practical record of a "downhill exit," sold while revenue was already half its peak.
Fin vs Fin: Profit Down 75% After a Google Update, Still Sold for Seven Figures — a “Damaged Asset” Exit Strategy
Wellness-product comparison site Fin vs Fin grew to $1M in annual revenue and $70K in monthly profit, then saw organic traffic cut in half by Google's Helpful Content Update. Even so, armed with 300+ brand partnerships and its revenue data, it drew 10 LOIs and sold for seven figures — three times annual profit — holding the discount to just 15%.
10,000 Subscribers and ¥166,000 a Month on 1–2 Uploads per Month: Real Data From a Gadget YouTube Channel That Switched to "Quality Over Quantity"
Kurashiki Log, who runs a gadget and lifestyle channel as a side project, disclosed ad revenue of ¥165,945 at the 10,000-subscriber mark — on only 1–2 uploads per month. After two stagnant years, the pivot to "quality over quantity" accelerated growth from 4,000 to 10,000 subscribers in six months.
PDFShift: An HTML-to-PDF API at $8,500/Month — One Channel Ended a Two-Year Plateau; a $500K Sale Fell Through
A Paris-based solo developer's HTML-to-PDF conversion API earned $9 on day 20, reached 150 customers and $3,200/month by January 2020, and turned profitable that September. MRR flatlined for over two years starting September 2021, then returned to 8–9% monthly growth after resuming Google Ads, now at $8,500/month.
Extra Points: A Newsletter With 679 Paid Subscribers and $4,300/Month, Sold for “Cash + a Job + Equity” — Then Bought Back Three Years Later
Extra Points, a newsletter covering the business side of college sports, was sold to D1.ticker at the stage of 679 paid subscribers and roughly $4,300 in monthly revenue, for a package of cash + a writing job + equity (low six figures, about 2x ARR). Founder Matt Brown kept writing after the sale and bought the business back in 2024.
24 Udemy courses earning $1,500/month, $53,000 cumulative — the 3.5 years since switching to mass production once "$100 per course" became visible
A Udemy instructor with 24 courses earns about $1,500/month and $53,000 cumulative over 3.5 years, after shifting from hit-seeking to steady course production.
From selling 4 pieces for ¥2,400 to ¥200K-500K/month — the ¥600 price point an 8-year handmade artist walked away from
Handmade artist Uni sold ¥600 earrings that moved once every few days — 4 sold meant ¥2,400 total. Eight years in, she now earns ¥200,000-500,000+ a month, driven by repricing and a production workflow built to support higher prices.
Stella: MVP in 2 Days, $350K/Month in 2 Months — an AI App Built by a Solo Creator With 4 Million Followers
AI visualization app Stella hit $300K/month (about ¥45M) two months after launch and $350–360K by interview time, from a 2-day MVP. 12,000 paying customers and 200,000+ downloads. Building a distribution network of 1.2M on Instagram and 2.8M on TikTok before the product mattered.
Earlyname: Six Rounds of Counteroffers That Turned a $4,500 Bid Into $10,500 — the Complete Record of Selling Small
Ben Stokes built Earlyname in three weeks, ran it for six months at $350/month in subscription revenue, and sold it on MicroAcquire for $10,500 — 30x monthly revenue. He published the entire negotiation, including all six rounds of emails that moved the buyer's opening bid of $4,500 up to $10,500.
¥50,000–70,000 a Month in Royalties From 24 Kindle Books: 16 Months of Real Data on "Volume-Production" Self-Publishing, ¥750,000 Cumulative
An author who published 24 books via Kindle self-publishing discloses actual royalties month by month. The first 3 months brought ¥5,000–14,000/month, month 6 crossed into the ¥50,000s, and it has held steady at ¥50,000–70,000/month since. The 16-month cumulative total exceeds ¥750,000 — a "diversified portfolio of books" earning ¥2,000–3,000 per title per month.
A Licensed Tax Accountant Earning ¥700,000 a Month on Coconala: The Record of Reaching Top Category Ranking in Under a Year
JUN, who runs an accounting practice while working at a listed IT company, started on Coconala in June 2019 and reached over ¥700,000 in monthly sales and top placement in the licensed-professionals category (PRO certification) in under a year. His first order, two months in, was worth ¥3,000. A case demonstrating the fit between professional licenses and skill marketplaces.
Formula Bot: An Excel-Formula AI Built During Parental Leave Hit $23,000/Month — Zero Lines of Code, $5,000 in Marketing
David Bressler, from Florida, built an Excel formula-generating AI on Bubble.io during summer 2022 parental leave. It spread on Reddit and made its first sale within 5 minutes of launching paid access; monthly revenue is now $23,000 (about ¥3.45M), on total marketing spend of $5,000.
Easlo: $20K/Month and 356K Followers From Notion Templates, Weekends Only in Military Service
Jason Chin (Easlo) started posting on X on weekends during military service, growing a Notion template business to $20,000/month and 356K followers.
Superpower ChatGPT: Built in 3 Days, Free for 9 Months — 420K Downloads and 350K Newsletter Subscribers
Saeed Ezzati launched an extension he built in 2-3 days during ChatGPT's very first week. He gave it away completely free for 9 months, building a base of 420K downloads, 150K weekly users, and a 350K-subscriber newsletter before introducing a paid tier — reaching five-figure MRR.
Career Sidekick: Selling a Career Site Doing $50K a Month at 80% Margins — Growth by “Niching Down Twice,” and the Exit
Career Sidekick, the career-advice site of former recruiter Biron Clark, grew to 1 million monthly visits (80%+ from search), $50K+ per month, and 80%+ profit margins, and was sold in December 2022 to Singapore's Amai Group (price undisclosed). The brokered sale was "a second job lasting 2–4 months."
Six AI videos, ¥153,030 in the first month — one video with 4.22 million views drove two-thirds of TikTok monetization revenue
An AI video creator posted six videos in TikTok's first monetization month and earned ¥153,030, with one 4.22-million-view video generating about two-thirds of it.
Marketing Examples: 130,000 Subscribers in Three and a Half Years — a “Distribution” Playbook and a $2,300/Month Sponsor Slot
Harry Dry's free newsletter Marketing Examples launched in April 2019 and reached 130,000 subscribers in about three and a half years. A Product Hunt launch brought 2,000, and the rest came from manual distribution into 15-20 Facebook groups and beyond. One sponsor slot started at $2,300/month.