I Built an Android App With Zero Backend — Here's What Happened

A Japanese developer built ZEROLOG, a fully offline Android daily planner app, using React 19, Vite 7, Tailwind CSS v4, and Capacitor 8. The app operates without any backend, accounts, tracking, or notifications, designed to mimic the simplicity of pen-and-paper planning while keeping all data private on the user's device. The developer successfully passed Google Play's 20-tester requirement to publish the minimalist, zero-backend application.

I got tired of apps trying to monetize my attention. Notifications, ads, endless feeds — it never stops. So I decided to build an Android app with zero backend. I'm a Japanese developer, and English isn't my first language, so I used AI to help write this article. How many productivity apps have you downloaded, only to be greeted by a mandatory registration screen, bloated interface, pop-up ads, or a constant push for a premium cloud subscription? Something felt missing from every app I tried. I wanted the simplicity of a paper notebook combined with the convenience of a smartphone — a tool where my thoughts and tasks stay private, on my own device, without constant distraction. So I built ZEROLOG — a fully offline, minimalist daily planner for Android. In this article, I’ll share: The design philosophy The tech stack The challenges of building a 100% offline app And how I passed Google Play’s 20-tester requirement The Philosophy: "Analog-Inspired" Digital Minimalism ZEROLOG is inspired by pen-and-paper planning. No loading No accounts No tracking No notifications Just open the app, write your day, and move on. The Tech Stack React 19 Vite 7 Tailwind CSS v4 Capacitor 8 Why Capacitor? Capacitor lets me build with React while still accessing native features like: Haptics vibration feedback Local filesystem Native notifications Building a 100% Offline App