Comparison

Calx vs Formula Calculator #

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

Formula Calculator #

Perform calculations with a vast library of built-in formulas or create your own. Save and sync custom formulas to the cloud for easy access across devices. Includes a comprehensive scientific calculator.

Highlights
  • Extensive built-in calculation formulas
  • Create and save custom formulas
  • Cloud synchronization for custom formulas
  • Share custom formulas with others
  • Comprehensive scientific calculator
Features
Read full description

The formula calculator comes with a wide range of built-in calculation formulas, allowing you to complete calculations simply by entering the required parameters. It also features built-in custom formulas, catering to individual needs. Once a custom formula is set up, you only need to input the parameters during your next calculation to quickly obtain the results, thereby improving efficiency. Moreover, you can share your custom formulas with friends or other devices for convenient calculations. After logging in with your account, you can synchronize your custom formulas to the cloud to prevent any loss. Additionally, it includes a comprehensive scientific calculator that meets various calculation needs.

Screenshots

Calx3 screens
Formula Calculator #4 screens

Verdict

The call

The clearest difference is price: Formula Calculator # at Free against Calx's $0.99. Formula Calculator # also leads on update cadence (every 5 weeks vs every 24 months). Calx's advantage is in-app purchases (none vs 4) and ads (none vs shown). On rating, review sentiment, ratings volume 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

Formula Calculator # is free to download; Calx costs $0.99 up front. Formula Calculator # sells 4 one-off in-app purchases. Calx asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Calx against 5.0 for Formula Calculator #. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Calx ships an update every 24 months, Formula Calculator # every 5 weeks. The most recent releases landed on August 12, 2026 and September 14, 2026 respectively.

Scorecard5 real differences · 5 level
Calx versus Formula Calculator #: the parameters behind the verdict, then further details
ParameterCalxFormula Calculator #
Price$0.99Free — better
Rating5.0 (2 ratings)5.0 (2 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings22
Update frequencyEvery 24 monthsEvery 5 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS12.012.0
Further details — not scored
Size4 MB67 MB
Age rating4+4+
DeveloperDaniel Clelland威 刘

Customer experience

Calx

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

Formula Calculator #

All ratings2 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

4 purchases

Formula Calculator #

One-time4
  • 1 month subscription$1.49
  • 3 months subscription$2.49
  • 6 months subscription$3.49
Show 1 more
  • 1 year subscription$4.49

Questions

Is Calx free?
Calx costs $0.99, with no in-app purchases.
Is Formula Calculator # free?
Formula Calculator # is free to download, with in-app purchases available.
Which has better reviews, Calx or Formula Calculator #?
Calx and Formula Calculator # are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.
Do Calx or Formula Calculator # have ads?
Formula Calculator # shows ads; Calx does not.
Which is updated more often, Calx or Formula Calculator #?
Calx ships an update every 24 months, and Formula Calculator # every 5 weeks. Most recently, Calx was updated on August 12, 2026 and Formula Calculator # on September 14, 2026.

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