Numalog
A local-first, privacy-focused baby tracker PWA for one-tap logging of feeds, diapers, sleep, with optional opt-in cloud sync.
Problem it solves. Provides a private, no-signup-required way for parents to log baby care events without ads, subscriptions, or selling data.
Who pays. Parents of newborns / caregivers
Market. parenting / consumer health apps (PWA)
How it makes money. None planned; possible donations if costs grow
Author provides a working product URL, concrete usage metrics (100 visitors/day, dozens of families actively logging), description of stack and scaling behaviour, and multiple commenters corroborate the accidental traction and privacy-first approach.
“one thing to keep in mind, the Philippines market might have very different willingness to pay than a US or EU audience. if costs do grow you might want to figure out who your power users actually are geographically before picking a monetization model.” ▲ 20
“Built nearly the same thing ... the market is somewhat saturated.” ▲ 18