Monotape - Smart Calculator with Tape History & Labels
Calculator meets
Notepad
Calculate at the speed of thought.
Never wonder "What was this number for?" again.
More than just a calculator
Text Calculations
You can attach text labels to every calculation. Write "Rent: 80,000" and you'll always know what it means months later.
Reuse Variables
Reference past results by their label. Change a past value, and all dependent results are automatically updated.
Smart Tape
The tape history is not just a log. Every line is a "live variable" that can be reused in your next calculations.
Functions
Drop in SUM and the numbers above add themselves up. Average, maximum and median work the same way.
Grocery run
Milk 3.80
Eggs 4.20
Bread 2.50
Detergent 7.90
--------------------
SUM() 18.40↑ totals the four rows above
- ✓Note rows are skipped, so you can break a list into readable sections
- ✓SUM for subtotals, TOTAL for the grand total — nothing double-counted
- ✓Edit a source number and every total recalculates instantly
Ever felt this way?
Monotape solves the common problems of ordinary calculators.
"What was this number?"
I calculated 1,200 + 450 + 980, but looking back I can't remember what those numbers were for at all.
Solved by Monotape:
They stay as "Lunch: 1,200", "Coffee: 450", "Books: 980" in your history, so you will always understand what they mean.
"Starting over again..."
Just one number was wrong, but now I have to type the entire sequence of calculations all over again.
Solved by Monotape:
You can go back and edit any value at any time. All dependent results are automatically updated, so you never have to start over.
Easy to Use
Input
Input formulas intuitively with a keypad just like a normal calculator.
Calculate & Label
Press = to save the result to your history. You can add a label at any time.
Reference & Recalculate
Tap a past result to use it in your next calculation. Edit the original value and everything updates automatically.
Useful Information for Monotape
We have prepared articles on how to better utilize your smart calculator.
Add up multiple numbers automatically
SUM, average, maximum, median — how the aggregate functions total a list for you.
Read articleCalculator history as notes
Never wonder what a number meant again. Why labeling every result beats a plain history list.
Read articleFix one number, recalculate everything
Tired of redoing the whole calculation? Use references so one edit updates every result that depends on it.
Read article6 best calculator apps with notes
Compared by use case, so you can pick the smart calculator that actually fits how you work.
Read articleKeep a running total while shopping
Stop getting surprised at the register. Label each item and watch the total grow so you never bust your budget.
Read articleSplit a bill down to the last cent
Odd cents, weighted shares, a head count that changes — label the parts and one edit settles the split cleanly.
Read articleScale recipe portions for any head count
Take 2 servings up to 5 without mistakes. Set the factor once and one edit rescales every ingredient.
Read articleGet the percent-off price right
30% off plus 10% off isn't 40% off. Keep each stage on a line and change a rate to recalculate instantly.
Read articleIs bulk really cheaper? Compare by unit price
Bigger isn't always cheaper. Put each unit price on a line side by side and let the comparison update as prices change.
Read articleSummarize receipts by category
Sort a stack of receipts the easy way. Keep each category total on its own line and fix any typo in one spot.
Read articleAlways forget what you just calculated?
A few sums in a row and the last number blurs. Label every line and the context stays attached to the math.
Read articleKeep the whole working visible
A plain calculator hides your steps behind the equals sign. Put each step on a labeled line so the working stays in view.
Read articleStop retyping everything to fix one digit
One wrong number should not mean a full redo. Keep each figure on its own line and edit just the one that was off.
Read articleStop losing your math when the app closes
A calculator app forgets the moment you look away. A labeled tape saves your results locally so you can return anytime.
Read articleAnswer wait, what was the total again?
Keep the total and its breakdown on the tape, so you answer by reading instead of recalling, even days later.
Read articleTotal your cart right in the aisle
Add one labeled line per item and watch the running total grow, so you know what the cart costs before the register does.
Read articleKnow your monthly food spend without hoarding receipts
Skip the month-end receipt pile. Add one labeled line per trip and the monthly grocery total builds itself.
Read articleKeep a record of what each expense was for
Explain any reimbursement number weeks later. Label each cost and the total keeps its breakdown attached.
Read articleSee your fixed monthly costs at a glance
Rent, utilities, subscriptions — list each by name and one clear total finally stays in plain sight.
Read articleWork out the real price after cashback
Five percent back, but what do you actually pay? Label price and rate to compare the effective price.
Read articleGet price with tax and before tax in seconds
Stop converting tax in your head. Put the rate on one line and flip either direction in a tap.
Read articleAdd up unit-price-times-quantity without retyping
One wrong quantity shouldn't redo the whole order. Make each item a labeled line and edit just one.
Read articleHow to Estimate DIY Material Costs Without Retyping Every Item
Lumber, screws, paint, brushes — a DIY project has so many line items that a plain ca…
Read articleHow to Calculate Wallpaper and Flooring Quantity and Cost in One Tape
Figuring out how much wallpaper or flooring a room needs means measuring area, conver…
Read articleHow to Build a Quick Work Estimate That Keeps Its Breakdown
A client wants a ballpark number now, but a plain calculator gives you a total with n…
Read articleHow to Estimate a Freelance Quote by Hours and Rate the Easy Way
Pricing a freelance project means estimating hours per task, multiplying by your rate…
Read articleHow to Build Up an Event Budget Line by Line Without Losing Track
Venue, catering, decor, rentals — a wedding or event budget is dozens of moving figur…
Read articleHow to Reverse-Calculate Cost, Profit, and Margin Before You Negotiate
Before you set a price or agree to a discount, you need to know your profit and margi…
Read articleSplit a bill when some people pay more
Manager covers more, new hire pays less. Give each person a line so one edit keeps the uneven split fair.
Read articleBuild a travel budget by category
Flights, hotel, food, activities. Label each category, watch the total, and split per person in one edit.
Read articleCalculate your monthly income from an hourly wage
Hours vary every week. Log each week as rate times hours and build a running monthly total you can adjust.
Read articleCalculate your side hustle profit
Revenue minus expenses, kept on the tape. Label each cost and read your profit any time, month after month.
Read articleStop googling unit conversions like kg to g
Enter the factor yourself once, label it, and reuse the conversion from the tape instead of searching again.
Read articleRoughly convert foreign currency before a trip
Enter your own rate and label each price to compare foreign costs in dollars. Change the rate once to reconvert all.
Read articleWork out fuel cost before a road trip
Distance, mileage, and gas price as labeled lines. Change the price or add a leg and the estimate reworks itself.
Read articleTeach money sense with allowance and savings
Label allowance, spending, and savings on the tape so a kid can watch the numbers climb toward a goal.
Read articleHow to Choose a Profit Margin Calculator App
Label cost, price, and margin, then edit one number at a time to recalculate your pricing.
Read articleDownload Monotape
The smart calculator that makes sure you never wonder "What was this number for?" again.
Frequently Asked Questions
Q. How is it different from a normal calculator?
A normal calculator only shows the result. Monotape saves all your calculations with labels. You can always check what a number was for, and if you edit a value, all references update automatically. It's the power of a spreadsheet, with the ease of a calculator.
Q. What happens if I correct a past calculation?
All calculations referencing that value will be automatically recalculated. For example, if you change "Rent" from 80,000 to 85,000, your "Total" line will instantly update.
Q. Is my data saved to the cloud?
No. All calculation data is saved only on your device. Your data is not uploaded or sent anywhere. It is completely private.
Q. Which platforms are supported?
Monotape is available on both iOS and Android.