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37signals, the private company behind Basecamp, never publishes its revenue, so estimates scatter from $25M to $280M. A source-typed ledger, plus the one 2006 Bezos check that complicates the 'never took a dime' legend.
A composite founder diary (2026): the month I broke a five-month plateau at $29K MRR by repositioning a horizontal 'scheduling for everyone' tool into a product built for one vertical. The panic of a shrinking funnel, the six-week trial dip, and why narrowing took MRR from $29K to $41K without a single new marketing tactic.
1Password says it passed $400M ARR while free cash-flow positive, yet trackers quote everything from $200M to $782M. A source-typed ledger, plus the 13-year bootstrap that ended in a $920M raise.
In 2026, the endpoint you optimize for growth is the same one fraudsters optimize for abuse. A composite founder diary about the morning a card-testing bot turned a frictionless signup form at $35K MRR into a stolen-card validation service, and the 48-hour scramble to shut it down.
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.
In 2026, the fastest way to lose your biggest customer is a backup you never tested. A composite founder diary about the night a botched production migration erased roughly 22 hours of customer data at $40K MRR, when the newer backup had been failing silently for months and the freshest clean copy was almost a day old. It covers what was lost, the email that had to go out, the agency that churned, and the restore-drill and point-in-time-recovery changes that cut the recovery point objective from about a day to five minutes.
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.
In 2026, one four-sentence email can undo a year of growth. A composite founder diary about the month a core integration partner raised its API price roughly 10x and gutted its free tier overnight at $46K MRR, echoing the real 2023 Reddit and Twitter/X API shocks: the triage, the customer email, and the re-architecture that cut our single-vendor dependency.
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.
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.
