Mac app

Papi

A calculator you can talk to, with a spreadsheet built in.

Free · Version 0.1.4 · macOS 12 or later · Signed and notarized by Apple

Papi's calculator answering plain-English lines like “5lbs to kg”, with its spreadsheet tab behind it.

Always one shortcut away.

Press ⌥' in any app and Papi drops down from the menu bar. Press it again and it's gone. No window to hunt for, no tab to open.

Don't like ⌥'? Change it in Settings.

Type it the way you'd say it.

A notepad that does math. Write a line on the left, the answer appears on the right, and it updates as you change anything above it.

Papi converting 1250 USD to euros, adding 8 hours and 45 minutes, finding the date in 30 days and next Friday, and converting km to miles and °F to °C. — Currencies, hours, dates and units, in plain words.

Papi calculating a bill of 86.4 increased by 18%, then divided by 3. — Split the bill, tip included.

A monthly budget in Papi: rent, food, transport and fun, summed, then multiplied by 12. — Name your lines, then sum them.

Papi taking 30% off a price of 249, working out 30% of the price, then adding 12%. — What the sale actually saves you.

Percentages: bill increased by 18%
Of, off, on top. Also on a variable or the last result.
Currencies: 1250 usd to eur
USD, EUR, GBP, CHF and JPY. Rates update daily and still work offline.
Units: 100 m2 to sqft
Mass, length, volume, time, temperature, data, area and speed.
Dates: today + 14 days
Today, next Friday, 3 months ago.
Time: 2h + 35min
Add and subtract durations like numbers.
Names: rent: 1450
Label a line, then use it: rent + 50. prev is the last answer.
Totals: sum
Sum, average, min or max of the lines above. A blank line starts a new block.
Math: sqrt(144) + 2^3
Parentheses, powers, mod, roots, logs, trig, pi and e.

And a spreadsheet, when lines aren't enough.

One tab over. Real formulas, without opening Excel for a two-minute job.

Papi's spreadsheet with a SUM formula and the cells it refers to outlined. — The cells in =SUM(D2:D4) outlined as you type.

Papi's spreadsheet with a budget selected and Sum, Average, Count, Min and Max in the bar below. — Select a range, get the stats underneath.

About 400 Excel functions: SUM, IF, XLOOKUP, PMT and the rest
The cells a formula uses light up while you type it
Sum, average, count, min and max of whatever you select
Drag the fill handle in any direction and formulas follow
Copy and paste adjust references, the way they should
Undo, redo, bold, italic and three fill colors
50 rows by 26 columns, A to Z

The small things.

Lives in your menu bar
No Dock icon, no window to find. It's just there.
Opens where you are
On whichever Space you're on, in whatever app.
Saves as you type
Close it mid-thought. It's all there next time.
Click to copy
Click any answer and it's on your clipboard.
Updates itself
New versions download quietly. It asks before restarting.
Launch at login
Optional. Your shortcut and precision are settings too.

No account. No tracking.

No sign-up, no analytics, no telemetry. Everything you type stays on your Mac.

It only goes online twice: once a day for exchange rates from frankfurter.dev, and a few times a day to check GitHub for a new version. You can switch the second one off.

Free, and the code is public.

Open source under GPL-3.0. Read it, build it yourself, or tell me what's broken: Report a Problem is right in the menu.

New in 0.1.4 · October 4, 2026

Spreadsheet: the fill handle now drags in every direction (right, left, up, down) with formulas adjusting; the handle was previously hard to grab.
Calculator: variable names are case-insensitive (Rent: 1450, then rent + 50).
"Report a Problem…" now opens the bug-report form with your version prefilled.

All release notes

Get Papi.

Free for Apple Silicon and Intel Macs, about 98 MB.