Tracking car expenses: spreadsheet vs app, honestly compared

A spreadsheet is the right tool for tracking car expenses if you will keep it up, and the wrong one if you will not. That is the whole decision. Everything else is about how each option makes the habit easier or harder: how fast a fill-up is to log on a phone at a pump, whether fuel economy is calculated for you, whether anything reminds you a service is due, and whether the record survives a new phone. Here is a fair comparison, including the places a spreadsheet wins.

Where the spreadsheet wins

• Flexibility. Any column you like: tolls, insurance, parking, that odd part number. No app will match a sheet you designed for your own car.
• Analysis. Pivot tables, charts, a cost-per-km formula you understand because you wrote it.
• Sharing. Send a link, give a mechanic or a buyer a read-only view.
• Ownership. Your file, your format, exportable forever.
• Cost and longevity. Free, and still readable in twenty years.

Where the spreadsheet loses

• Logging on a phone. Open the app, find the file, find the row, scroll right, type into five cells with a keyboard that wants to autocorrect litres into "liters". Ninety seconds, at a pump, with the car behind you honking. This is where most spreadsheets die.
• Formulas. Insert a row in the wrong place and your fuel economy column is quietly wrong for a year.
• Units. Nothing stops you entering gallons in a litres column after a holiday.
• Reminders. None. The next service date lives in your head.
• Several vehicles. Separate tabs, separate totals, manual consolidation.
• Backup. Only if the file is in cloud storage and you remember which folder.

Where a dedicated app wins

• Speed. Scan the receipt or type four fields; ten to twenty seconds. The habit survives.
• Calculations done for you. Fuel economy between full fills, cost per km, monthly spend per vehicle, trends.
• Reminders. Next-service date becomes a notification, refuel reminders catch a missed fill.
• Structure. Units and currency per vehicle; entries keep the unit they were logged in.
• Several vehicles. One account, one dashboard, filter by vehicle.
• Sync. Sign in on a new phone and the history is there.

Where a dedicated app loses

• Fixed categories. If the app tracks fuel and service, that is what you get. Insurance and tolls may not fit, at least not yet.
• Export. Varies. Some apps export CSV, some do not yet. Check before committing years of data.
• Lock-in and lifespan. Apps change, get acquired, or stop. Prefer ones that export, or that are clear about their roadmap.
• Analysis beyond the dashboard. You see what the designer decided to show.

The six-month test

Picture yourself at a petrol pump on a wet Tuesday evening in six months. Which record gets updated? If the honest answer is "the spreadsheet, every time," keep the spreadsheet. If it is "probably neither," choose the tool that takes the least effort at that moment, because the best tracker is the one with data in it. For most people that is an app with receipt scanning, and the spreadsheet becomes an occasional export for deeper analysis.

Switching without regret

1. Keep the spreadsheet as the archive for everything up to today.
2. Start the app with your next full fill, so economy figures begin cleanly.
3. Copy the big dates across by hand: last service, tyres, brakes, battery. Five entries, ten minutes.
4. After three months, compare the app's monthly spend with what the spreadsheet used to say. The difference is usually the fills you forgot to type.

For a feature-by-feature table, see spreadsheet vs app.