Generator Tracker: Run hours, fuel and maintenance log for your generator

Hi Product Hunt 👋 I'm Yuri, a developer from Ukraine. With scheduled blackouts, a generator here is an everyday appliance — and the questions are always the same: how many hours has it run, when is the next oil change, how much fuel is left and how much does it burn per hour? Most people keep a paper notebook or nothing at all. Generator Tracker answers those with as few taps as possible: ⚡ Start/Stop from the home screen — engine hours count themselves, several generators can run at once, Undo if you stopped by mistake ⛽ Fuel left and runtime estimate from the tank size; litres per hour from your refills 🔧 Maintenance by engine hours, days or both — overdue tasks show on the home screen 📊 Monthly charts per generator 🌙 Big buttons for the dark and a true black theme that saves battery during outages 🔒 Offline-first: everything stays on the phone; an account is optional and only syncs your own devices. Open source (MIT). Editions: on iPhone/iPad it's free, with a small banner on two screens that a one-time purchase removes (no subscriptions). On Android there's the full paid app with no ads, and a free Lite version in closed testing — testers welcome: https://groups.google.com/g/gene... Built with React Native/Expo and Firebase. I'd love your feedback: what would make it useful for your generator — at home, on a site or in a rental fleet?