Comparison

Calx vs Calc Pro

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

Head to head
About

Calx

This calculator app utilizes Reverse Polish Notation (RPN) for efficient calculations by manipulating numbers on a stack. It offers a guided tutorial, gestural interaction, multiple keypads with various functions, and customization options for fonts and colors.

Highlights
  • Reverse Polish Notation (RPN)
  • Gestural interaction
  • Multiple keypads (basic, scientific, statistical)
  • Customizable fonts and colors
  • Guided tutorial
Features
Read full description

CALX is an RPN calculator — a calculator designed to work with a list of numbers. This means that instead of just typing an equation into your calculator, you push numbers onto a stack, and then apply operations to the lowermost numbers in the stack. It's bizarre, but it makes sense once it clicks. If this all sounds confusing, don't worry! CALX comes with a guided tutorial which will get you up to speed in three minutes. Features: • Gestural interaction: Manipulate your data with simple, intuitive gestures. • Multiple keypads: CALX features an array of basic, scientific, and statistical functions. • Customization: Select from different fonts and colours to find a combination that works for you.

About

Calc Pro

This powerful calculator handles complex equations and huge numbers with up to 15 digits of precision. It saves your calculation history, allowing you to reuse previous equations and answers. Access scientific functions like square root and logarithms easily with a swipe.

Highlights
  • Complex calculations
  • Huge number handling
  • Calculation history
  • Scientific functions
  • Dark Mode
  • Copy answer
Features
Read full description

Calc Pro can do complicated calculations easily. It is a very powerful math calculator but easy to use. Calc Pro also handles huge numbers without ellipsis. Most calculators will only handle calculations involving numbers with up to 13 digits, but this one allows for larger and more precise calculations, supporting up to 15 digits of precision to the right of the decimal, and big enough digits to the left. Calculation history won't be lost when the app is closed. You can reuse calculation equations and answers by tapping. Calc Pro also supports mathematical functions like square root, logarithm, combinations, and permutation. You can easily access these functions by swiping. Features: - Arithmetic - Calculation with parentheses - Dark Mode - Huge Number Handling - Copy calc answer with a long press - Calculation history - Scientific calculation - Swipe to change the keyboard easily

Screenshots

Calx3 screens
Calc Pro4 screens

Verdict

The call

The clearest difference is price: Calc Pro at Free against Calx's $0.99. Calc Pro also leads on update cadence (monthly vs every 24 months). Calx's advantage is ads (none vs shown) and rating (5.0 vs 4.8). On review sentiment, ratings volume, in-app purchases and device support 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

Calc Pro is free to download; Calx costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Calx holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 2 and 5 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Calx ships an update every 24 months, Calc Pro monthly. The most recent releases landed on August 12, 2026 and September 21, 2026 respectively.

Scorecard6 real differences · 4 level
Calx versus Calc Pro: the parameters behind the verdict, then further details
ParameterCalxCalc Pro
Price$0.99Free — better
Rating5.0 (2 ratings) — better4.8 (5 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings25 — better
Update frequencyEvery 24 monthsMonthly — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaidAd-supported — better
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better18.0
Further details — not scored
Size4 MB8 MB
Age rating4+4+
DeveloperDaniel ClellandKeita Nonaka

Customer experience

Calx

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Calc Pro

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Calx

No in-app purchases

None

Calc Pro

No in-app purchases

Questions

Is Calx free?
Calx costs $0.99, with no in-app purchases.
Is Calc Pro free?
Calc Pro is free to download, with no in-app purchases.
Which has better reviews, Calx or Calc Pro?
Calx is rated higher. Calx averages 5.0 out of 5 from 2 ratings, while Calc Pro averages 4.8 from 5 ratings.
Do Calx or Calc Pro have ads?
Calc Pro shows ads; Calx does not.
Which is updated more often, Calx or Calc Pro?
Calx ships an update every 24 months, and Calc Pro monthly. Most recently, Calx was updated on August 12, 2026 and Calc Pro on September 21, 2026.

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