Comparison

Calca vs Signal Conditioning

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Calca

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.

Highlights
  • Symbolic calculation
  • Equation solving
  • Expression simplification
  • Markdown text editor
  • Real-time updates
  • Unit and currency conversion
  • Matrix operations
Features
Read full description

Calca is a powerful symbolic calculator that gives you instant answers as you type. It solves equations and simplifies complex expressions - it's a computer algebra system in your pocket! It's also a rich Markdown text editor so that you can explain your ideas alongside your calculations. Calca is perfect for professionals and students - anyone who works with numbers and equations. Variables and functions can be created with only a few keystrokes and can be manipulated with a rich library of operators and functions. Calca updates as you type - just like a spreadsheet. You can declare variables, edit their values and watch everything update before your eyes. Since everything is calculated on the device - no network needed - you get answers instantaneously. All calculations are stored as plain text so you can easily share them with other editors and move them from device to device. Calca has been designed to work with iCloud documents so all your devices can access your calculations - you'll always have the latest files ready for viewing and editing. Calca comes with a suite of examples to help you get started covering topics from home mortgages to kinetics. All these examples are fully explained within Calca itself. Are you still using a desktop calculator? Are you using the calculator with the giant buttons that came with your OS? Computers are much more capable than doing simple one-line arithmetic - put your machine to work with Calca! Calculation Features: • Variables `x = 42` • Functions `f(c) = 9/5*c + 32` and even recursive functions • Units `42 mph in kmph` and currency `¥599 in $` • Solves equations (`x + 2x + 4x = 42`, what is x?) • Matrices with inverses so you can solve linear equations • Sum, prod, map, and reduce operations on lists, matrices, and ranges • Trigonometry and complex numbers • Derivatives of functions • Logic operations and if statements • Binary math (& and |) and support for binary and hex number (`0xA9` and `0b1010`) • Keeps track of units (m, s, m/s, m/s^2, etc.) so you can verify your equations as you compute Please visit http://calca.io to see lots of examples. Thank you for looking!

About

Signal Conditioning

Features
Read full description

Measuring voltages and currents using ADCs usually requires properly conditioning the signals to match the ADC's characteristics: mainly scaling and shifting. Usually circuits based on Operation Amplifiers are used for this purpouse with differente approaches for voltages and currents. Signal Conditioning application picks the suitable circuit basing on input and output signals' characteristics and makes all the required calculations providing a conditioning circuit in a matter of minutes.

Screenshots

Calca4 screens
Signal Conditioning4 screens

Verdict

The call

The clearest difference is in-app purchases: Signal Conditioning at none against Calca's 2. Signal Conditioning also leads on price ($3.99 vs $9.99). Calca's advantage is update cadence (every 5 months vs every 21 months). On ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Calca costs $9.99 and Signal Conditioning $3.99 up front. Calca sells 2 one-off in-app purchases. Signal Conditioning asks for nothing beyond the download.

UpkeepUpdate frequency

Calca ships an update every 5 months, Signal Conditioning every 21 months. The most recent releases landed on October 21, 2026 and October 10, 2026 respectively.

Scorecard3 real differences · 7 level
Calca versus Signal Conditioning: the parameters behind the verdict, then further details
ParameterCalcaSignal Conditioning
Price$9.99$3.99 — better
Rating4.5 (157 ratings) — better—
Positive reviews76.5% of reviews—
Number of ratings157 — better—
Update frequencyEvery 5 months — betterEvery 21 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.0 — better16.1
Further details — not scored
Size78 MB1 MB
Age rating4+4+
DeveloperKrueger Systems, Inc.Fabrizio Boco

Bugs and requests

Calca

Reported bugs

12 issues
  • Magic Keyboard causes number input to overwrite instead of append
  • Text selection before numbers triggers increment/decrement instead of selecting
  • Cursor jumps forward and backward with external keyboards
  • iPad Pro keyboard truncation in portrait mode
  • Arrow key (=>) doesn't work in landscape mode
Show 7 more
  • App crashes on startup on some devices
  • File saving is temperamental and causes data loss
  • Folders don't persist unless calculations created within them
  • Large number calculations lose precision (10^100 + 1 - 10^100 returns 0 instead of 1)
  • Keyboard focus issues on iPad with Magic Keyboard
  • iOS 13+ button adaptation issues
  • Spinning beach ball on very large calculations

Requested features

15 requests
  • Files app and document browser integration
  • Dropbox and Google Drive support
  • Date calculation functionality
  • Looping and iteration support
  • User-defined function storage in separate files
Show 10 more
  • Temperature unit support (Celsius, Fahrenheit)
  • Logarithmic and non-proportional unit definitions
  • Multiple parametric plots simultaneously
  • Landscape mode optimization
  • Tabular data and multi-row markdown table support
  • Dark mode (now implemented)
  • Subscription model option for ongoing development
  • Decimal place formatting control
  • Charting and financial functions
  • Better document management interface

Signal Conditioning

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Calca

One-time2
  • 6-Month Optional Patronage$4.99
  • 12-Month Optional Patronage$7.99
None

Signal Conditioning

No in-app purchases

Questions

Is Calca free?
Calca costs $9.99, and also offers in-app purchases.
Is Signal Conditioning free?
Signal Conditioning costs $3.99, with no in-app purchases.
Do Calca or Signal Conditioning have ads?
Neither Calca nor Signal Conditioning shows ads.
Which is updated more often, Calca or Signal Conditioning?
Calca ships an update every 5 months, and Signal Conditioning every 21 months. Most recently, Calca was updated on October 21, 2026 and Signal Conditioning on October 10, 2026.

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