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Proton doesn't publish revenue, so 2024 to 2025 estimates run ~$97.5M (GetLatka) to $105M (ZoomInfo), up from ~$70M ARR in 2022. A sourced ledger of the Swiss privacy company that hit 100M accounts on roughly $2.5M ever raised, then gave itself to a non-profit foundation.
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.
Buttondown's founder Justin Duke is radically transparent about growth and profitability, but stopped publishing his revenue. The best estimate is roughly $392K a year and rising 61%. Inside the bootstrapped newsletter tool that hides its own number.
Simple Analytics never took a cent of funding and grew almost entirely by word of mouth. The dated ledger runs from $30K ARR in 2019 to a ~$500K/year third-party estimate in 2026. The number is real. The lesson underneath it is slower than it looks.
Fathom Analytics has never published its revenue, on purpose. The only figure in circulation is a third-party estimate of $5M to $10M ARR. Inside the privacy company that keeps its own numbers private.
Ghost publishes its finances live: $10.8M ARR, $907K MRR, 3.05% churn, 30,441 customers. The real story is not the number. It is the non-profit structure that means the company can never be sold.
Plausible crossed $1M ARR in 2022 from $64 MRR in 2019, bootstrapped and profitable. The real growth lever was not privacy. It was hiring a distribution co-founder.
