iPhone App · Calculator

Ledger 63 A vintage style calculator for iPhone

The feel of a classic adding machine, the tools of a modern calculator. A glowing display, chunky keys, scientific functions and a paper ledger that remembers every calculation so you can tap to reuse it.

App Store link coming soon Try it in your browser

Designed for iPhone.

Ledger 63 basic mode on iPhone with a paper ledger of past calculations above a green glowing display and cream keypad

Ledger 63 scientific mode with sin, cos, tan, log, ln, square root, pi and RAD toggle keys

Platform: iPhone
Modes: Basic + Scientific
History: Tap to reuse
Data: Stored on device

Features

Every number has a place.

A familiar calculator with useful tools close at hand, wrapped in a design that makes everyday maths a little more fun.

Basic and scientific modes

Switch between everyday arithmetic and scientific functions: sin, cos, tan, log, ln, powers, square roots, π, e and percentages, with degrees or radians.

Edit any expression

Place the cursor inside an expression to fix a typo instead of starting over, and see the result preview update as you type.

A ledger of your calculations

Every calculation is printed to a paper style tape, grouped by day with timestamps, so you can look back at your work.

Tap to reuse

Tap a past expression to recall it, or tap a result to insert it into the current calculation. History stays on your iPhone and can be cleared anytime.

Ledger 63 calculator modes, functions and controls on iPhone
Mode / Area	Keys & Controls	How It Works
Paper Ledger Tape	Timestamps · Recall expression · Insert result · Clear	Every completed calculation prints to the scrollable paper tape. Tap a past expression to edit it, or tap a result to insert it into your active calculation.
VFD Display	Cursor placement · Live preview	Glowing vacuum-fluorescent style display shows your full expression on the top line and a live result preview underneath before you press equals.
Basic Mode	`0–9`, `.`, `+`, `−`, `×`, `÷`, `( )`, `C`, `AC`, `⌫`, `=`	Tactile cream and charcoal keys for everyday arithmetic, receipts, totals, and grouped expressions.
Scientific Mode (`f(x) SCI`)	`sin`, `cos`, `tan`, `log`, `ln`, `xʸ`, `√`, `π`, `e`, `%`, `RAD / DEG`	One tap expands the scientific function rows and angle unit toggle without leaving the vintage interface.

Interactive web demo

Try the ledger & scientific mode right here.

Test how Ledger 63 feels in your browser: switch between BASIC and f(x) SCI, watch each calculation land on the paper tape, and click any past expression or result to reuse it.

0–9 Type numbers with your keyboard
+ − * / Operators, plus ( ) for grouping
↵ Equals, ⌫ delete, Esc clear all

LEDGER · 0

Your calculations will print here

RADLEDGER 63

8888888÷6

= 1481481.33333

Interactive browser preview of Basic & Scientific modes. The iPhone app adds in-place cursor editing and persistent on-device history.

Screenshots

A calculator with character.

Cream keys, a green glowing display and a paper ledger, inspired by the adding machines of the past.

Ledger 63 basic mode: ledger tape with timestamps, display showing 8888888÷6 with preview result, and keypad — Basic mode
Everything you need for quick sums and totals, with the ledger always in view.
Live result preview under the expression
Ledger grouped by day with timestamps
Delete single lines or clear the whole tape

Use cases

For the numbers in your day.

Everyday

Quick arithmetic

Add up receipts, split a bill or check a total in basic mode, with every step kept on the tape.

Study & work

Scientific functions

Switch to scientific mode when an expression calls for powers, trigonometry or logarithms.

Revisit

Pick up where you left off

Look back through earlier calculations and reuse an expression or result as the starting point.

How to use Ledger 63

Ready, set, calculate.

Make a calculation and use the ledger to continue your work.

1
Enter an expression
Use the keypad. The display shows a result preview when the expression is valid.
2
Choose a mode
Use Basic for everyday maths or switch to SCI for more functions and RAD/DEG.
3
Calculate
Tap equals. The calculation is added to the ledger with a timestamp.
4
Revisit or reuse
Tap a past expression to bring it back, or a past result to insert it.

FAQ

Questions, answered.

Everything you might want to know before downloading.

Does Ledger 63 have scientific functions?

Yes. Scientific mode provides trigonometry, logarithms, powers, square roots, π, e, percentages and a degrees/radians setting.

Can I edit an expression?

Yes. Tap within the expression to position the cursor and make a change. The result preview updates as you edit.

Can I use a previous calculation again?

Yes. Tap an expression in the ledger to recall it, or tap a result to insert it into your current expression.

Where is my calculation history stored?

Ledger 63 stores calculation history locally on your iPhone. You can delete single lines or clear it within the app.

Does Ledger 63 need an internet connection?

No. Calculations run on your device and history is stored locally.

Where can I download Ledger 63?

The App Store page is being prepared. The download link will appear on this page when it is live.

A little more joy in every calculation.

Bring some vintage character to the numbers in your day.

App Store link coming soon Try the web demo

PicCute

Batch image compression and conversion for Mac. Shrink files by over 60%, processed locally.