A free, offline mobile app that splits any amount of money into percentage-based shares with kopiyka-level precision — no rounding drift. Built for Ukrainian sole proprietors (FOP), marketplace sellers, and budgeters, with ready-made tax presets, custom templates, JSON import/export, dark mode, and an EN / UA / RU interface. Shipped to Google Play with Nuxt 3, Vue 3, TypeScript, and Capacitor.
Splitting income by percentages — taxes, the military levy, savings, the 50/30/20 rule — sounds trivial until rounding every share separately leaves you a kopiyka short or over, and the total no longer balances. People were doing it by hand in calculators and spreadsheets, re-entering the same schemes every time, and had no quick offline tool that simply guaranteed the math added up.
I built a lightweight cross-platform app where every split is computed in whole kopiykas so the parts always sum back to the original amount with zero rounding error. On top of the calculator I added reusable presets — create, edit, and duplicate your own percentage templates — plus built-in FOP schemes (Single Tax Group 3, military levy). Everything works fully offline with data stored on-device, presets export/import as JSON for moving between phones, and the UI ships in three languages with light and dark themes that follow the system.
A focused utility that turns a fiddly, error-prone calculation into a two-second action and is live on Google Play. Entrepreneurs reconcile taxes per payment, sellers see net profit after commissions instantly, and budgeters divide income by their own rules — all without internet and without rounding surprises.