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Calca

Calca

Advanced symbolic calculator

148 ratings
163 reviews
📚 Education
📊 Productivity
$9.99
In-App Purchases

Details

  • Released
  • Updated
  • July 6, 2013
  • October 17, 2025

Developer

Krueger Systems, Inc.
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Calca screenshot #1 for iPhone
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Calca screenshot #7 for iPhone
iphone
ipad
🧾$4.99 - $7.99
In-App Purchase↘︎
📌Ready
Reviews summary↘︎
⭐163
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📝1+ tags
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🔄6+ apps
Alternatives↘︎
❓5 answered
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📦w/o updates
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About

This app is an advanced symbolic calculator and text editor. It solves equations, simplifies expressions, and allows you to explain your work alongside calculations. Calculations update instantly as you type, and all data is stored as plain text for easy sharing and device syncing.

✓Symbolic calculation
✓Equation solving
✓Expression simplification
✓Markdown text editor
✓Real-time updates
✓Unit and currency conversion
✓Matrix operations
Show original description

What users say

Summarized from real user reviews of Calca. Based on 148 reviews and a 4.5/5 average, it highlights the 10 positives and 10 negatives reviewers mention most about this Productivity app.

Positive things

  • 💡Unique blend of text editor and calculator
  • 📝Markdown support for documentation
  • 🔄Dynamic recalculation of all values
  • ⚙️Powerful mathematical and algebraic capabilities
  • 📊Unit conversion and unit-aware calculations
  • 💾Plain text file format for portability
  • 🔗iCloud sync across devices
  • 📈Graphing and plotting functionality
  • 🎯Intuitive syntax and easy to learn
  • 💰One-time purchase model (historically)

Negative things

  • 🐛Magic Keyboard input bugs on iPad
  • ⚠️Appears abandoned or poorly maintained
  • 🐛Text selection issues with external keyboards
  • 📱iPad landscape mode problems
  • 🐛Cursor jumping and screen jumping during editing
  • 🚫Limited file management options
  • 🐛Occasional crashes and stability issues
  • ⏱️Slow input responsiveness at times
  • 🔢Precision issues with large number calculations
  • 🐛Number editing gesture conflicts with normal text selection
See all reviews

What's New in Calca

1.7.2

October 17, 2025

* New binary shift operators (like C's) * More detailed reason if Apple Intelligence fails * Fix toolbar colors when editing documents

More
2

In-App Purchases

$7.99

12-Month Optional Patronage

Support Calca development for one year.

User reviews

Most RecentHighest RatedLowest Rated

My favorite app for thinking with numbers

I’m not even a math person but I love this thing. Unlike a spreadsheet, the operations are in plain sight, so they are part of the story. And unlike Soulver (which is also great in its own way) I can interleave text such that I can describe a scenario, make a case, frame the numbers, etc.
Avi FlaxAvi Flax

Best calculator app by a wide margin

Calc is pretty much all the good things in one. It lets you enter equations, solves them algebraically, handles graphing, is super flexible and free-form to the point where you think, document, and calculate all at once.
Connoisseur95Connoisseur95

Love it!

So useful. Use it all the time on iPhone and my MacBook.
angzarrangzarr

A cessé de fonctionner

Depuis une récente mise à jour, l'app ne fonctionne plus. Le développeur contacté n'a pas répondu. J'ai dû basculer sur une feuille de calcul dans Apple Numbers. Dommage, Calca était bien pratique.
Ust-KamoUst-Kamo

Fantastic app

I’ve used Calca for years on iOS and Mac, and I love it for all sorts of computation.

The most recent update with iOS 18 support fixes some issues I’ve hit with iPad Pro and Magic Keyboards—I really appreciate it!
Christian E.Christian E.
See 158 more reviews

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User experience

🐞

Reported Bugs

12 issues

Magic Keyboard causes number input to overwrite instead of append

Bug

Text selection before numbers triggers increment/decrement instead of selecting

Bug

Cursor jumps forward and backward with external keyboards

Bug

iPad Pro keyboard truncation in portrait mode

Bug

Arrow key (=>) doesn't work in landscape mode

Bug

App crashes on startup on some devices

Bug

File saving is temperamental and causes data loss

Bug

Folders don't persist unless calculations created within them

Bug

Large number calculations lose precision (10^100 + 1 - 10^100 returns 0 instead of 1)

Bug

Keyboard focus issues on iPad with Magic Keyboard

Bug

iOS 13+ button adaptation issues

Bug

Spinning beach ball on very large calculations

Bug
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Requested Features

15 requests

Files app and document browser integration

Feature

Dropbox and Google Drive support

Feature

Date calculation functionality

Feature

Looping and iteration support

Feature

User-defined function storage in separate files

Feature

Temperature unit support (Celsius, Fahrenheit)

Feature

Logarithmic and non-proportional unit definitions

Feature

Multiple parametric plots simultaneously

Feature

Landscape mode optimization

Feature

Tabular data and multi-row markdown table support

Feature

Dark mode (now implemented)

Feature

Subscription model option for ongoing development

Feature

Decimal place formatting control

Feature

Charting and financial functions

Feature

Better document management interface

Feature

FAQ

What does Calca do?

Calca is a powerful symbolic calculator that solves equations and simplifies complex expressions. It also functions as a rich Markdown text editor, allowing you to explain your calculations alongside your work. It's designed to be a computer algebra system accessible on your mobile device.

What are the key calculation features?

Key features include variable and function declaration, unit and currency conversion, equation solving, matrix operations with inverses, list and matrix operations, trigonometry, complex numbers, derivatives, logic operations, and binary math. It also tracks units to help verify equations.

How much does Calca cost?

The application is available for free with in-app purchases. This model allows users to try out the core functionality before deciding to unlock additional features or capabilities through purchases.

What devices is Calca compatible with?

Calca is designed to work across multiple devices, leveraging iCloud documents for seamless syncing. This means your calculations can be accessed and edited on any device where you use Calca, ensuring you always have the latest files available.

Who would benefit from using Calca?

Calca is ideal for professionals and students who frequently work with numbers and equations. Its advanced calculation capabilities and integrated text editor make it useful for tasks ranging from complex mathematical analysis to explaining financial models or scientific concepts.