Issue 9 · July 2026
TypingMind launched five days after OpenAI opened the ChatGPT API and crossed $500,000 in revenue within a year. Here is what solo operators can copy from Tony Dinh's build-in-public playbook.
In-depth founder interviews, MRR journeys and post-mortems — with the real numbers.
Naomi Tate built a quiet $7,400 MRR tool for solo bookkeepers, no paid ads, in 18 months. In June 2026 she sent the wind-down email. Not because she failed. Because her infra bill, her toddler, and her own client roster all added up to a different answer than the spreadsheet she started with.
A composite vertical-SaaS founder hit $9,120 MRR running entirely on four AI agents, then made her first paid hire in March 2026, not a developer, an operations contractor at $22/hr through Deel. The 60-day result: NPS +14, churn -1.2 pp, founder hours -11/wk. With the math, the agent she retired, and what she'd do the same.
Inés Vargas, a solo founder in Bilbao, hit 100 paying customers in 90 days for $1,470 in total spend. The itemized cost breakdown, the LinkedIn voice-DM channel that beat cold email 27x, the pricing flip at customer 38, and the channel she'd skip if starting again. Told as told to Joaquín del Río, with the spreadsheet on the table.
Marta del Sol runs a one-person operations studio from Valencia and crossed $4,120 in MRR across nine clients, with three AI agents doing the delivery and a $612 monthly software bill. Here's the real arc: the underpricing she's embarrassed by, the month two clients churned at once, why her clients renew for the Friday report and not the robot, and the caveats she insisted we print next to every number.
Cadence reached $12,400 in MRR with 140 accounts and an up-and-to-the-right graph, then the founders shut it down on purpose. This is the post-mortem of the most dangerous number in startups: too much to walk away from, too little to live on. The retention they didn't track, the customer they optimized for and shouldn't have, the fork they took too late, and the unusually honest way they ended it.
Get the next MRR journey, post-mortem or day-in-the-life the moment it ships. No fluff, no growth-hacks — just the real numbers.
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