Author
Joaquin del Rio covers the money behind the milestones for OperatorBook, digging into what bootstrapped and indie founders actually earn and what it took to get there.
Mailchimp hit about $800M in revenue with zero venture capital, sold to Intuit for roughly $12B in 2021, and in May 2026 Intuit confirmed its revenue is now declining. A source-typed ledger, and what actually transfers.
Craigslist has never disclosed its finances, so every revenue figure is an estimate. The famous $694M stat is a frozen 2018 peak; AIM Group data shows it has fallen to about $302M by 2024. Here is the sourced ledger and the operator lesson.
Midjourney has never disclosed revenue, so 2026 estimates run from $150M to $500M ARR. Here is the sourced ledger, the pricing math, and the number that actually holds.
Obsidian has never disclosed revenue, so 2026 estimates run from about $2M to $25M. Here is the sourced ledger, the pricing math, and the number that holds.
Lemon Squeezy hit $1M ARR in nine months, turned down a $50M Series A, then sold to Stripe for an undisclosed sum. An honest, source-typed revenue ledger, and why the disclosed number is the least interesting part.
ClickFunnels revenue peaked at a reported $265.3M in 2023, then fell to about $170M in 2024. An honest, source-typed ledger, plus the raise it never announced.
Calendly is private and stopped confirming its revenue, so third-party estimates now range from about $70M to $349M. Here is the source-typed ledger, the bootstrapped-then-$3B-raise story, and what actually transfers to operators.
PostHog publishes its salaries, strategy, and board decks, yet keeps its revenue deliberately vague. The company says 'low $10s of millions'; analyst Sacra estimates ~$57.5M ARR (Feb 2026); Stripe says 'on pace for $100M.' A sourced, typed ledger of what PostHog actually earns, and why the most open company in dev tools blurs its own top line.
Zapier's revenue is estimated near $310 million a year, reached on a single $1.2 to $1.4 million seed and profitability since 2014, then valued at $5 billion via a secondary sale. A source-typed ledger of what is confirmed, what is estimated, and what transfers.
Zoho crossed about Rs 12,313 crore (roughly $1.4 billion) in FY25 revenue, up 17.8%, having never raised a cent of venture capital. A source-typed ledger of how, and what actually transfers.
Todoist has crossed $100M in cumulative revenue, fully bootstrapped, and its founder says the number is the boring part. A dated, source-typed revenue ledger for Doist, and what actually transfers from a 17-year customer-funded climb.
Ahrefs is a fully bootstrapped, nine-figure SEO business, but it has never published an official revenue figure. The one hard number it let slip, ~$257M, and the operator lesson behind it.
