See how much propane is left, and how many days it will last

Name: Tankline
Author: Growing Peas

Tankline reads your ultrasonic tank level sensor and shows the gas left in your bottle as a percentage, on a gauge you read at a glance. With Pro, it also tells you how many days of gas are left at this week’s pace, so a refill is planned instead of discovered mid-cook.

Get it on Google Play Android 12 and later · free for every sensor

Tankline's home screen: a bottle gauge for the barbecue at 68 percent of an 11 kg bottle, its temperature, sensor battery and level in millimetres, and a spare 6 kg bottle at 14 percent below. — Every bottle at a glance, days of gas left, and the spare watched just as closely.

The barbecue bottle's 30-day chart with lowest, average and highest level, a trend reading about 41 days left at this week's pace, and an alert set below 20 percent. — Every bottle at a glance, days of gas left, and the spare watched just as closely.

If your tank sensor shows a level but not when you will run out

A percentage tells you where the bottle is today. What you want to know before a cook or a weekend away is when it will be empty. Tankline keeps the readings on your phone and, in Pro, turns them into days of gas left at the pace of the past week, for each bottle, including the spare waiting beside it.

It reads Mopeka Pro Check, Pro Plus, Pro-200 and TD40 sensors live, with no pairing and no account. It is a separate app, made by me, and not affiliated with Mopeka.

Made for the bottle you use

Choose your bottle once from the home screen: 20, 30 or 40 lb cylinders, 6, 11 or 14 kg bottles, or any tank by its height.
Horizontal tanks too, flat or rounded ends, from presets or your own dimensions.
Charts of the level, with the lowest, average and highest value.
A low-level alert on each bottle.
The last value and when it was heard, even when the sensor is out of range.
A home screen widget with your bottle’s level.
Light and dark themes that follow your phone, and layouts made for tablets and foldables.

What is free, and what one purchase adds

Free: every sensor live, the bottle gauge, the last 24 hours, and alerts while the app is open.

Pro, one purchase that stays yours: days of gas left at this week’s pace, a low-level alarm with the screen off, even with the phone in your pocket, a year of history with week, month and year charts, and CSV export of every reading. Google Play shows the price in your own currency. No subscription, no account.

The level is an estimate from the sensor reading and the bottle you choose. Tankline does not detect gas leaks: follow your gas supplier’s safety instructions.

Who makes it

I do: one person, on my own, under the name Growing Peas. Mail goes to [email protected] and I answer it myself. There is no account and no cloud: readings stay on your phone, and the app never asks for your location. The privacy policy says so in full.