About the App
A personal household tracker that turns everyday consumption into real, actionable numbers — so you can shop smarter, waste less, and feel in control.
Lasts How Long? is a dead-simple consumption tracker for the household products you use every day — toilet paper, shampoo, coffee, vitamins, cleaning supplies, and more.
Open a new roll of paper towels? Log it. Two weeks later when you run out, hit "Mark as Finished" and the app instantly tells you it lasted 14 days and cost you 7¢/day. No math. No spreadsheets. Just honest numbers about your life.
Log a product, choose a start date, and the app tracks how long it lasts. When you run out, mark it finished and see exactly how many days it lasted.
Track best-before dates on food, medicine, and more. Know what's expiring soon so nothing goes to waste.
Automatically calculates how much of a product you consume per day based on quantity and duration. No spreadsheets required.
Enter the price you paid and instantly see your cost per day, week, or month for any product. Budget smarter.
Everything lives in your browser's local storage. No accounts, no servers, no cloud. Your data never leaves your device.
Download your data as a JSON backup any time. Re-import it on another device or after clearing your browser.
Most people have no idea how fast they go through a bottle of shampoo or a box of cereal. Now you will.
Seeing that your coffee costs $1.40/day makes grocery decisions crystal clear. Small numbers, big awareness.
No sign-up, no subscription, no app store. Just open the page and start tracking. Your data is always right here.