In-depth founder interviews, MRR journeys and post-mortems, with the real numbers.
71 posts
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.
At $33K MRR an agency offered to white-label and resell my product, projecting twelve to fifteen thousand in new MRR. A composite founder diary on why I said no, the discount math the pitch hid, and the referral deal I offered instead.
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.
At $31K MRR I stopped burying cancellation and stopped fighting refunds. The chargebacks that friction was quietly manufacturing fell away, and MRR kept climbing.
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.
At $10K MRR my growth stalled, and it was not the top of the funnel. Only about 22% of new signups ever reached value. A composite founder diary on rewriting onboarding around one activation milestone, and the eight weeks that followed.
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.
At $27K MRR one account offered $45,000 for a custom build plus $3,000 a month, if I would build a bespoke module only they would use. A composite founder diary on why I said no, the arithmetic that changed my mind, and the roadmap test I use now.
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.
The month I crossed $23K MRR, a card-testing attack slipped a few hundred fraudulent charges past my checkout. Weeks later the disputes rolled in, my dispute rate crossed 0.75%, and my processor froze payouts. A composite founder diary on chargebacks, watchlists, and frozen cash.
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.
The month I crossed $26K MRR, my Firebase bill jumped almost six times with no new growth. A composite founder diary on Firestore read costs, migrating the hot paths to Postgres, and why the pattern, not the tool, was the real problem.
