Replenish
Cost per day · iPhone & iPad
Every price has a daily cost
Replenish turns the price of everyday purchases into daily and monthly costs, based on how long each purchase lasts. Log what you buy, and the price becomes a number you can plan with.
Paper towels
- Unit price
- $4.00
- Quantity
- 6 rolls
- Total
- $24.00
- Lasts
- 96 days (about 3 months)
- Cost per day
- $0.25
- Est. monthly cost
- $7.50
The problem
Price is one number. Spending isn't.
Most apps treat price like a single number. That's not how spending works. The things you buy again and again don't cost you once — they cost you a little every day until they run out.
If you buy six rolls of paper towels at a time and they last three months, what does that actually cost per month? You can't estimate it easily. And if you can't estimate it, you can't plan for it.
Recurring expenses are easy to underestimate when you only see the price once. Replenish shows you the number that's been missing.
How it works
Three steps to the real number
No duration guessing and no spreadsheets — Replenish works it out from the purchases you log.
Add your items
Create an item for each thing you buy again and again — paper towels, soap, coffee — and group them into categories.
Log each purchase
When you buy, log it in seconds: unit price, quantity, and date. That's everything the app asks for.
See the real cost
Replenish measures how long each item lasts from the time between your purchases, then turns what you paid into an average cost per day and an estimated monthly cost.
Examples
From price tag to daily cost
A few everyday purchases, the way Replenish breaks them down.
Paper towels
- Unit price
- $4.00
- Quantity
- 6 rolls
- Total
- $24.00
- Lasts
- 96 days (about 3 months)
- Cost per day
- $0.25
- Est. monthly cost
- $7.50
Dish soap
- Price
- $5.94
- Lasts
- 22 days (about 3 weeks)
- Cost per day
- $0.27
- Est. monthly cost
- $8.10
Coffee
- Unit price
- $12.60
- Quantity
- 2 bags
- Total
- $25.20
- Lasts
- 42 days (about 6 weeks)
- Cost per day
- $0.60
- Est. monthly cost
- $18.00
Monthly estimates use a 30-day month, the same way the app calculates them. In the app, how long an item lasts comes from the time between your logged purchases.
The idea
Good decisions come from seeing the right number. Not just more numbers.
Replenish isn't a budgeting system or an expense ledger. It does one thing: it shows what your everyday purchases cost over time, so recurring expenses stop hiding behind a single price tag.
Features
Small app. Clear answers.
Everything Replenish does is in service of one number: what it costs you per day.
Log purchases in seconds
Unit price, quantity, date — done. Replenish handles the math from there.
Cost per day and per month
Every item shows its average cost per day and estimated monthly cost, right alongside its purchase history.
Categories that add up
Group items into categories like Paper Products or Personal Care and see a monthly total for each.
One clear stats view
Your estimated monthly cost, average cost per day, and a per-item breakdown — for everything, or filtered by category.
Private by design
Your data stays on your device. No analytics, no ads, no tracking.
Free on iPhone & iPad
Free on the App Store, with no in-app purchases.
Take a look
The app, as it actually is
Everything you replenish, in one list
Cost per day, at a glance
Monthly totals by category
Your whole picture, one screen
Privacy
Your numbers stay yours
Your data is stored locally on your device
All calculations happen on your device
No analytics or advertising
No third-party tracking
As listed on the App Store: the developer does not collect any data from this app.
Read the full privacy policyFAQ
Questions, answered
Yes. Replenish is free on the App Store, with no in-app purchases.
No. Just log purchases as they happen — unit price, quantity, and date. Replenish measures the time between purchases and works out how long each item lasts on its own.
Replenish spreads what you paid across the days a purchase lasted to get an average cost per day, then estimates the monthly cost using a 30-day month.
No. Your items and purchase history stay on your device, and the app uses no analytics, advertising, or third-party tracking. The privacy policy has the details.
Know what it costs per day
Free for iPhone and iPad. Log your first purchase today.
