Start and stop from Home
Running generators move to the top with a live timer and a big Stop button; idle ones sit below with Start. Stopped by mistake? Undo brings the session back with its original start time.
Now on Google Play and the App Store
Know every hour your generator runs.
Start and stop a generator in one tap, see how much fuel is left and never miss an oil change — for one backup unit at home or a whole fleet. Works offline. Syncs only if you want it to.
No ads · No tracking · Open source
- Works fully offline
- No ads, no tracking
- Optional cloud sync
- Open source, MIT
- English & Українська
Features
Built around the outage routine
The power goes out — start the generator in one tap — keep an eye on it — don't miss the service. Everything else the app works out for you.
Fuel left, estimated
Give a generator its tank size and the app keeps a running estimate — "≈ 2.4 L · ~4.8 h left" — from refills and run time. A refill takes a few taps: to full, same as last time or a stepper.
Clear analytics
Run hours and fuel by month for the last six months, split by generator colour — petrol and diesel are never summed into one bar — plus totals per generator.
Maintenance reminders
Oil, filters, spark plugs — set intervals by engine hours, by days or both. Each task shows how much of the interval is used, and overdue work is flagged on the home screen with ▲.
Any number of generators
From a single home backup unit to a rental fleet. Several generators can run at once; a live bar keeps the running ones a tap away on every screen.
Sync across devices
Sign in to keep a phone and a tablet in step. Edits made offline merge safely once you are back online.
Readable day and night
Warm paper light theme, true-black dark theme for OLED and night outages, plus a guide to the system red filter. English or Ukrainian.
How it works
Three steps, and the generator is on the record
No setup wizard, no manual. Everything else the app works out by itself.
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Step 1.
Add your generator
Name, model and power. One unit or a whole fleet — each gets its own history.
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Step 2.
Tap start, tap stop
Tap Start on the home screen when the power goes out and Stop when it comes back. Fuel used and engine hours are worked out for you.
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Step 3.
Service on time
Set intervals in hours or days. The home screen marks what is overdue with ▲, so service happens before a breakdown.
Live tracking
Start when it starts. Stop when it stops.
A live clock to the second, fuel used and fuel left in the tank, and big square buttons that are easy to hit in the dark during an outage or with gloves on a job site. Forgot to tap? Fix the start time later.
Maintenance
Service on time, not after a breakdown.
Each task tracks engine hours and days since the last service and shows the used part of the interval as a bar with a limit tick. Overdue and due-soon tasks are flagged on the home screen; one tap marks a task as serviced.
Refills
A refill in three taps.
Presets for "to full" and "same as last time", a stepper for anything else and a preview of the level after the refill. A full tank calibrates the estimate, and the app tells you when it was off.
Analytics
See where the hours and the fuel go.
Square monthly bars split by generator colour, all-time totals with litres per hour and a per-generator list — filter to one generator or look at all of them.
Compared
Paper logbook, spreadsheet or the app?
You can write hours down anywhere. The difference is what you can do with them afterwards.
| What you get | Paper logbook | Spreadsheet |  Generator Tracker |
|---|---|---|---|
| Works without internet | Yes | Partly | Yes |
| Hours added up automatically | No | Partly | Yes |
| Fuel consumption per hour | No | Partly | Yes |
| Service reminders by hours and days | No | No | Yes |
| Fuel left estimate and live timer | No | No | Yes |
| Monthly charts per generator | No | Partly | Yes |
| Same data on phone and tablet | No | Yes | Yes |
Platforms
Native on Android and iPhone
Not a web page in a wrapper. Material 3 on Android, the native iOS design — including Liquid Glass — on iPhone and iPad.
Android
Material 3 navigation, system dialogs and dark theme. Phones, tablets and foldables.
Android 7.0 and newer
Available on Google Play →
iPhone & iPad
Native navigation bars, SwiftUI forms, SF Symbols and Liquid Glass on iOS 26.
iOS and iPadOS 16.4 and newer
Available on the App Store →Privacy
Your data stays yours
Generator Tracker stores everything on your device first. An account is optional and used only to sync your own records between your devices.
Read the privacy policy →Local-first
Every record is saved on the device; the app is fully usable without an account or a connection.
No ads, no tracking
No analytics SDKs, no advertising IDs, no profiling. Nothing is sold or shared.
Open source
The full source code is on GitHub under the MIT license — anyone can check what the app does.
What's new
What's new in version 3.0.0
Generator Tracker 3.0 is redesigned around what you do during a power cut: start the generator in one tap, keep an eye on it, and never miss maintenance.
What's New
- Start and Stop from the home screen: running generators move to the top with a live timer, fuel left and a big Stop button. Several generators can run at once.
- Undo instead of "Are you sure?": Stop works immediately; tap Undo within 5 seconds if it was a mistake.
- Fuel left: add your tank size in the generator settings to see roughly how much fuel and how many hours are left. Marking a refill "filled to full" keeps the estimate accurate.
- New refill sheet: a stepper, quick presets (to full, same as last time) and a reminder to turn the engine off first — "Stop and refill" ends the session for you. After saving, "Start again" is one tap away.
- Generator screen: a live clock, fuel used and left, engine hours that include the running session, and maintenance bars showing how much of each service interval is used.
- Other generators at a glance: a bar at the bottom shows what else is running, with a Stop button.
- New look: a warm light theme and a true-black dark theme that saves battery, clear high-contrast buttons, and a theme setting (light, dark or system). Settings also explain how to turn on a red screen at night.
- Clearer analytics: monthly run hours and fuel as bars split by generator colour, totals and a per-generator list on one page.
- New app icon.
Changed
- Starting, stopping and deleting no longer show confirmation pop-ups.
FAQ
Questions, answered
Are there ads or in-app purchases?
No. There are no ads, no subscriptions and no in-app purchases.
Does it work without the internet?
Yes. Everything is stored on your device and works offline. If you sign in, changes sync automatically when a connection is available.
Which devices are supported?
Android phones, tablets and foldables on Android 7.0 and newer; iPhone and iPad on iOS and iPadOS 16.4 and newer.
Can I use it for several generators?
Yes — add as many as you need. Each one keeps its own sessions, refills, service plan and statistics.
How do I delete my data?
Data stored only on your phone is removed when you delete it in the app or uninstall the app. To delete your account and everything synced to the cloud, open Settings → Delete Account; if you no longer have the app, email yuri.valigursky@gmail.com. Details are in the privacy policy.
Which languages are available?
English and Ukrainian. The app follows your device language and can be switched in Settings.
Is the source code open?
Yes. Generator Tracker is open source under the MIT license — the full code, including this website, is on GitHub.
Put your generator on the record.
Offline-first and private. Installs in a minute.
Scan to installOpens Google Play or the App Store — whichever fits your phone.