A pocket calculator that answers back
Press a key and the little dumpling answers. Do a quick sum, or write what each line is for. Split a bill, convert a unit, plan a trip or a loan, then keep the work where you can find it.
iPhone · iPhone Duo
Expression128+36−18
Result146
Try 200+10% and read the base. After you select the calculator, the keyboard works too.
This page tries arithmetic, parentheses and relative percentages. The app also has scientific functions, undo and redo, and its own character keyboards. Animated styles require Plus. Reduce Motion uses still artwork.
Sheets
This weekend trip is a sample. Change a number and the total follows. When it looks right, send the expression back to the calculator above.
Quick tools
Six tools live in the workspace. Copy a result, or bring it back to the calculator.
Switch a unit, then keep calculating with the result.
Discount, markup and margin each show the base they use.
Enter the bill, a tip percentage and how many people.
Measure the span between two dates, or add and subtract days.
Add one length of time to another, or take it away.
Scale a quantity up or down by a ratio.
Inside the app
01Calculate
Arithmetic, parentheses, percentages, powers and scientific functions. Move the cursor inside an expression, undo, redo, or continue from the result. A percent added or subtracted tells you its base. The digits on screen stay separate from the value used for the next step.
Edit in place · relative percent
02Styles
Six classic styles are included. Picture keyboards and animated characters answer a press, and those extra styles require Plus. When Reduce Motion is on, animated styles use still artwork.
Six classics included · motion is Plus
03Workspace
Quick tools and saved projects sit together. You enter the assumptions and read the result beside its reasoning. The base app saves two projects. More require Plus. The projects and amounts in the picture are samples.
Sample projects · two saves included
04Sheets
Each line has a label and an expression. Save it, edit it, share the text, or copy a valid sheet back into the calculator without typing it again.
Save · share · copy back
05Loan
Loans and some other projects include a monthly plan. It is a fixed-rate estimate from the rate and term you enter, not a quote from a bank. Fees and tax rates are not fetched.
Monthly plan · not a bank quote
06Percent
The percentage tool writes the formula under the result. Copy it, or continue in the calculator. Rounding on screen does not replace the value underneath.
Discount · markup · margin
01/ 06
Twelve projects
Pick a project and enter your own numbers. The base app saves two. More require Plus. Fees, tax rates and exchange rates are not fetched for you.
Put a price on your time.
Make every sale add up.
A recipe for better margins.
Compare every pack on equal terms.
Make room in the budget for the trip.
Know what your hours add up to.
Turn room dimensions into a plan.
See what each month on the road costs.
Plan each payment before you borrow.
Give your goal a monthly path.
Make room for what matters.
See each renewal before it arrives.
Styles
Six classic styles come with the base app. The picture and animated styles below are part of Plus. Reduce Motion shows them as still artwork.
Included
A few of the Plus styles
The swatch uses each style's colors from the app. Pictures and characters are in the app.
iPhone and iPhone Duo
The same calculator. Unfold Duo and the readout and keys rearrange for the wide screen.
Calculate with one hand, open a sheet, or start a workspace project.
Unfolded, the wide layout sets the readout and the keys side by side.
Privacy
Calculations, sheets and projects are stored on this device. There is no app account. iCloud backup is off until you turn it on. A backup lives in your own iCloud and is for backup and restore, not live sync. Apple handles the purchase. PuffSum does not receive your card details.
PuffSum
Open it and start. When you want another keyboard, or room for more saved projects, Plus is in the app. Monthly, annual or lifetime: the price you see there is the price.
PuffSum Plus offers a monthly or annual auto-renewable subscription, or a lifetime one-time purchase. The base app includes six classic styles and up to two saved workspace projects. Additional keyboard styles and more saved projects require Plus. Prices and available plans are shown in the app. Projects use the numbers you enter. Fees, tax rates and exchange rates are not fetched. A loan schedule is a fixed-rate estimate, not a bank quote. Currency is a label and a precision setting. Screenshots include sample data and Plus styles so you can see the features.
