Solopreneur case studies — 6/10
Solopreneur and side-business cases
126–150 of 241
Resale Arbitrage, Month Three: ¥267,000 in Sales, ¥44,000 in Net Profit. The 16.3% Margin Cost Structure of a Reselling Side Business
Real data from month three of a side-business resale operation: sales of ¥267,389 against costs of ¥223,868, for a net profit of ¥43,521 (16.3% margin). Sourcing between day-job hours is uneven, and over 80% of revenue disappears into cost of goods and fees — the structure of physical-goods reselling, disclosed in a beginner's honest numbers.
NoteForms: A Notion Form Connector Built in 3–4 Days Grows Into $37K/Month — 18 Months of Solo Support
Julien Nahum built NotionForms in 3–4 days after Notion's API launched. It became NoteForms, a $37,000 MRR business, after prices rose from $15 to $24.
AI Generation × Adobe Stock: ¥500,000 a Year. Twelve Months of Real Data Behind the ¥42,000/Month a Salaryman in His 40s Built on Weekends Alone
Rossin, a company employee in his 40s, sells Midjourney-generated images on Adobe Stock and published his 2025 earnings month by month: ¥501,834 for the year (¥41,819 monthly average). The peak was ¥56,000 in December — seasonal assets drive sales. Three years of continuous operation, working weekends only.
SEO Tool TopicRanker Sold to Portfolio Operator iTrinity: A Division of Labor Where "Individuals Build, Specialists Grow"
TopicRanker, an SEO tool that finds keywords where weak competitors rank, was launched solo by SEO practitioner Dmitry Dragilev and sold to SaaS portfolio company iTrinity — a microcosm of the micro-SaaS market's growing split between building and operating.
A dance school with ~1,500 members was handed off after screening dozens of candidates. The turning point was "the results of a cancer screening"
Ayaka Saito founded the adult-beginner dance school "Carnelian" at 25 with 500,000 yen in capital. A 2020 cancer screening that found high-grade dysplasia pushed her to decide on succession, and after negotiating with dozens of candidates she handed the business to an inexperienced individual.
Snapbytes, an Atlassian-plugin specialist, sold to ecosystem leader Appfire: the strategy of growing in "someone else's yard"
Turkish developer Tuncay Senturk built and sold plugins for Atlassian products like Jira through his company Snapbytes, which was acquired by Appfire, a company rolling up plugins across the Atlassian ecosystem. A classic exit for a plugin business grown inside a marketplace.
Talknotes: 17 Built, 1 Hit — the Breakdown Behind an AI Voice-Notes App at $9,000/Month and 900 Paying Users
Talknotes, which turns voice memos into text using AI, was built in 3-4 days and launched for under $10 in upfront cost. It now has 5,000 users, over 900 of them paying, for about $9,000/month. The turning point was abandoning SEO and building a loop that recycled annual prepayments straight into ad spend.
Neck pillow brand Necklow hit $1M in 3 months — one viral ad and a $380K sale about two years later
Necklow, a D2C orthopedic neck-pillow brand, hit $1M in sales three months after launch, kicked off by a viral ad with 3M+ views. It grew to 80,000 total customers before selling to OpenStore for $380,000 in 2022.
Trends.vc: From $15 Lifetime Revenue to $24,000/Month in a Year — What Changed Was Where It Drew the Paywall
As of March 2020, Dru Riley's Trends.vc had lifetime revenue of a single $15 donation. By August that year it hit $24,000/month, and $38,000 by October. What worked was redrawing the paywall from "every other issue" to "the back half of every issue."
A "rustic wedding" blog sold to industry giant David's Bridal: the winning formula of theme specialization
Rustic Wedding Chic, a blog covering nothing but "rustic" style weddings, was sold by founder Maggie Lord to David's Bridal, the largest wedding retailer in the US. A case of "style-level specialization" inside a giant market becoming an acquisition target for a major player.
RemoteOK: $140K/month to $10K to $41K. What a remote job board's wild swings teach about "market dependency"
The remote-work job board RemoteOK hit $140K/month before the pandemic, then dropped 93% to $10K/month as market conditions soured, before recovering to $41K (about ¥6.15M). Pieter Levels' record of publicly disclosed swings shows the volatility inherent to a job board — a business sitting downstream of market conditions.
PsychCentral: Founded in 1995 With Zero Full-Time Staff, 7 Million Monthly Visits — a Mental Health Site’s High-Value Exit in Year 25
Psychologist John Grohol started PsychCentral in 1995. It grew to 7 million monthly unique visitors and $2M in annual revenue before selling to Healthline in 2020 for 3–4.5x revenue. The record includes details of a zero-full-time-staff structure and a negotiation tactic of walking away from the first offer to drive the price up.
Radius: From $708 in Year-One Revenue to a 6x-Revenue Exit 13 Years Later — an Insurance CRM Sold With No Broker, in a Two-Front Negotiation
Clu Connors started the insurance-agency CRM "Radius" on the side in 2009. It grew from $708 in first-year revenue to 8,000 paying users. In 2022, a PE-backed buyer that had acquired a competitor reached out via LinkedIn, and Connors negotiated the sale himself, with no M&A advisor, running two buyers in parallel to land "6x revenue" — all while running the business himself plus three contractors.
A gadget blog run by a full-time employee: 600,000 PV/month, ¥1.4M/month — what Makrin built over 2 years and 330 articles
Ryota Arai (Makrin) kept his corporate job while growing gadget blog "Makrin" to 330 articles over 2 years, reaching 600,000 monthly PV and about ¥1.4M revenue in May, with retail affiliates driving over half of it.
A takeout yakitori shop opened for about ¥500,000. A 9-item cost breakdown, and what "paid back in under 2 months" actually means
A current owner running a takeout-only yakitori shop in Osaka published a breakdown of his roughly ¥500,000 opening cost from about 15 years ago — a ¥50,000 grill, two ¥20,000 used fridges, ¥220,000 in property costs. He paid it back in under two months, with a realistic take-home around ¥400,000/month.
Data Fetcher: Stuck at $6,000 MRR for Five Months, Then $23,000 — Just by Changing How the Annual Plan Was Presented
Andy Cloke, running Airtable extension "Data Fetcher" alone from London, has reached $23,000 MRR (about ¥3.45M). After MRR went flat for five months starting August 2023, a 50% annual-plan discount and a change to the pricing page's default tab dropped churn from 10-11% to 7%.
23 indoor storage units in Shizuoka, ¥65,000 profit at full occupancy. Inside a solo investor's published 50% break-even point
A company employee with 15 years in HR started an indoor storage-unit investment (16.6 tsubo, 23 units) in Shimizu, Shizuoka in 2023. At full occupancy, sales of ¥153,300 minus management fees, electricity, and rent leave ¥65,305 — with a break-even occupancy rate of 50%. New contracts trickle in at just 0-2 per month.
Photopea: “Photoshop That Runs in a Browser,” Built Solo for 13 Years — a Bizarre P&L of $3M Revenue on $12,600 in Expenses
Ivan Kutskir started building the browser-based image editor Photopea while a student in 2012. It ran unmonetized for five years before he added ads in 2017. By 2021 annual revenue hit about $1M, and by 2024 it reached $3M (90% from ads) — with expenses of about $12,600 a year and development still done by one person.
Pallyy: A Former Locksmith Taught Himself to Code and Hit $74K MRR Solo — the “Agency-Focused, Lowest Price” One-Person SaaS
Tim Bennetto spent 10 years as a locksmith, taught himself to code, and built the social media tool Pallyy alone to $74K MRR (about ¥11.1M/month). A pivot from analytics to scheduled posting doubled MRR, and by specializing in "social media agencies" and staying near the market's lowest price point, he survived in a market crowded with giants.
A sole-proprietor apparel wholesaler turned away by a brokerage got 30+ inquiries right after listing. Succession completed in under 2 months
A sole proprietor dealing in design-registered women's apparel goods was turned down by a major M&A brokerage over scale and fees, then registered on TRANBI on the recommendation of a business handover support center. Inquiries came in immediately, eventually reaching 30+, and a multi-million-yen transfer closed in under 2 months with 3 meetings.
Own The Yard: 600 Articles in a “Backyard” Niche, Sold for About $250K in 3 Years — the Calculated Exit of a Public-Experiment Site
Spencer Haws of Niche Pursuits built Own The Yard around "backyard recreation and maintenance" and sold it for about $250K (40x monthly revenue, 3.3x annual revenue) at 600 articles and $6,000/month. Starting in 2018, it was run for 3 years with the exit in mind from day one.
Nomad List — from $500/month to $38K/month over 11 years: the longest-running "community subscription" case
Nomad List, a city database and community for digital nomads, started at $500/month in 2014 and compounded over 11 years to $38K/month (about ¥5.7 million). Run by Pieter Levels, it's one of the longest-running publicly documented member-subscription communities out there.
A resale side hustle's first-month take-home: ¥19,591. A DIY craftsman's full 5-month record of ¥730,000 in sales, ¥170,000 in profit
An individual running a DIY-proxy business in Nagano started resale ("sedori") in June 2025. Month one brought sales of ¥55,733 and profit of ¥19,591. After shifting entirely to online sourcing in August, sales swelled to ¥267,000 but margin halved to 16.3%, and total profit over 5 months came to ¥170,539.
The Water Coolest: Sold to Barstool at 100K Subscribers, Bought Back Two Years Later — the Full Round Trip
The financial newsletter The Water Coolest launched in 2017 and sold to Barstool Sports at 100,000 subscribers. When its parent company changed hands, the founder bought it back himself in October 2023. Both turning points came down to defending "whose voice this is written in."
116 free articles, 120,000 monthly page views, ¥150,000/month: the revenue breakdown of gadget blog "Kurashikilog"
A note without a single paid article for sale — just 116 free gadget articles pulling 120,000 monthly page views and about ¥150,000/month in affiliate income. The March 2025 breakdown was ¥92,473 from Amazon, ¥5,264 from Rakuten, and ¥53,900 from lead-gen deals, driven by tie-ins with a 10,000-subscriber YouTube channel.