GenRun: Generator Runtime
Fuel hours left, refuel time
Only for iPhone
₺99,99 · Designed for iPhone. Not verified for macOS.
iPhone
Fuel burn is not proportional to load. GenRun uses a load-dependent curve, so a light load will not hand you a wildly optimistic number of hours.
How long will the tank last? That is never a fixed number. It depends on how hard the generator is working, and that changes the moment somebody plugs in a kettle.
GenRun takes your generator's tank size and rated output, adds up what you are actually running, and estimates how many hours the fuel in the tank is good for — plus the clock time you will need to top it up.
WHY MOST ANSWERS ARE WRONG
The usual method is to take the rated runtime and divide by load. At a quarter load that arithmetic says you have plenty. In reality an engine burns a large share of its fuel simply spinning: friction, cooling and windage do not go away when the load does. On a typical small genset the proportional method can overstate light-load runtime by well over 200% — think 38 hours quoted when the honest figure is closer to 12.
GenRun models consumption as a no-load loss plus a load-proportional term, which is how fuel actually behaves.
A RANGE, NOT A FALSE PRECISION
Your biggest source of error is not the maths, it is not knowing exactly what your appliances draw. So GenRun shows a range rather than a single confident number. A wide range tells you to go and check something; a narrow one tells you the plan is sound.
ON THE LOCK SCREEN
A Live Activity keeps the countdown on your Lock Screen and warns you while there is still fuel in the tank, so the generator stops when you decide rather than at three in the morning.
IT LEARNS YOUR MACHINE
Log three or more real refuels and GenRun works out your machine's own burn rate. Engines drift from the manufacturer's figure as they age, and a well-used site genset is not the same machine it was when new.
FUELS AND UNITS
Petrol, diesel and LPG. Bottled gas is tracked by weight in kilograms, the way it is actually sold, rather than being fudged into litres.
CARBON MONOXIDE
The app opens with a full-screen warning about carbon monoxide the first time you run it, and it cannot be skipped. Generators are for outdoors only — never in a garage, porch, conservatory or caravan awning, even with the door open.
PRACTICAL NOTES
Everything the app produces is an estimate to help you plan a refuel, not a promise. Check the tank yourself. Shut the engine down and let it cool before refuelling, and follow the manufacturer's instructions for your machine.
PRIVACY AND PRICE
No sensors, no accounts, no network connection. Everything stays on your iPhone. One payment, no subscription, no in-app purchases, no adverts.
Useful when a winter storm takes out the power, on a caravan or narrowboat, at a remote site, on a market stall, or anywhere a small engine is standing between you and the dark.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
The developer, Yoshiaki Hirokawa, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Yoshiaki Hirokawa
- Size
- 4.4 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
English and 43 more
- English, Arabic, Bengali, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Gujarati, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Korean, Malay, Malayalam, Marathi, Norwegian Bokmål, Oriya, Polish, Portuguese, Punjabi, Romanian, Russian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Tamil, Telugu, Thai, Traditional Chinese, Turkish, Ukrainian, Urdu, Vietnamese
- Age Rating
4+
- 4+
- Copyright
- © 2026 netflowers
