Readwise

Daniel Doyon and Tristan Homsi launched Readwise in 2018 after being frustrated that they'd read hundreds of books with Kindle highlights they never looked at again. The insight: reading without review is mostly forgetting. Readwise syncs all your Kindle, iBooks, Instapaper, Pocket, and web highlights, then sends you a daily email with five highlights using spaced repetition. They charged $7.99/month from day one, targeting the small but passionate segment of serious non-fiction readers. Growth came through word-of-mouth from obsessive readers who recommended it endlessly. They wrote a detailed blog post explaining why they chose to bootstrap rather than raise VC — the market wasn't big enough for a billion-dollar outcome, but it was plenty big enough for a profitable indie business. They later launched Readwise Reader, a full-featured read-later app. The company stays intentionally small, prioritizes user happiness over growth, and has remained bootstrapped and profitable.