Ever been hit with a late fee, not because you couldn't pay, but because you forgot? That's why BillDay exists. A privacy-first bill tracker for Android. No account, no bank login, no cloud, everything stays on your phone. Track bills by due date, get smart reminders, see spending insights, and compare providers with country-specific Bill Guides. Available worldwide in multiple languages with localised guides for being rolldedout for more and more countries. Free. Solo-built. No upsell.