Comparison

Four Formula Calculator vs CalcFast

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

Head to head
About

Four Formula Calculator

Read full description

A free calculator app that allows you to calculate while looking at 4 formulas at the same time. Root calculation is also possible with root(number) such as root(2).

About

CalcFast

A fast and elegant calculator for Apple devices that displays your calculation history. It offers a Today Extension for quick access and supports Apple Watch, external keyboards, and VoiceOver.

Highlights
  • Calculation history display
  • Today Extension for quick calculations
  • Apple Watch app
  • Dark/light mode selection
  • External keyboard support
  • VoiceOver support
Features
Read full description

Fast and simple calculator for iPad, iPhone and Apple Watch that shows the calculation history, includes a Today Extension that allows for fast calculation by swiping down and 3D Touch for quick interactions. Numbers are formatted for your country, i.e. period in the US and comma in Europe. Ever lost your train of thought half way through a calculation and thought how handy it would be to review your calculations. The aim of this Calculator is to be fast, elegant and simple. Features: - The calculator can open side by side or over other apps in iPadOS. - Select dark or light mode. - External keyboard support. - Smart Apple Watch Calculator included. - Light weight Today Extension included. - Calculations shown when input and on tape. - Key click confirms pressing of buttons, which may be turned off. - Previous calculation is repeated when the equal sign is pressed. - Numbers are shown in local format, depending on your Region Formats, i.e. comma used in Europe. The number of decimal digits may be set in the Settings. - VoiceOver is supported. - Calculations Tape may be deleted by Tapping on it.

Screenshots

Four Formula Calculator1 screens
CalcFast3 screens

Verdict

The call

The clearest difference is ads: CalcFast at none against Four Formula Calculator's shown. Four Formula Calculator's advantage is iOS requirement (12.0 vs 27.1). On price, update cadence, 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 8 level
Four Formula Calculator versus CalcFast: the parameters behind the verdict, then further details
ParameterFour Formula CalculatorCalcFast
PriceFreeFree
Rating—4.2 (21 ratings) — better
Positive reviews—78.3% of reviews
Number of ratings—21 — better
Update frequencyEvery 2 monthsEvery 2 months
AdsYesNo — better
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better27.1
Further details — not scored
Size4 MB6 MB
Age rating4+4+
DeveloperSHIGETO TAKAGIHannes Sverrisson

In-app purchases

None

Four Formula Calculator

No in-app purchases

None

CalcFast

No in-app purchases

Questions

Is Four Formula Calculator free?
Four Formula Calculator is free to download, with no in-app purchases.
Is CalcFast free?
CalcFast is free to download, with no in-app purchases.
Do Four Formula Calculator or CalcFast have ads?
Four Formula Calculator shows ads; CalcFast does not.
Which is updated more often, Four Formula Calculator or CalcFast?
Four Formula Calculator ships an update every 2 months, and CalcFast every 2 months. Most recently, Four Formula Calculator was updated on October 26, 2026 and CalcFast on October 24, 2026.

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