Comparison

Devalluator Calculation Tool vs Rapid & Quick Calculator Pro

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

Head to head
About

Devalluator Calculation Tool

Easily calculate various percentage-based financial scenarios with large buttons and hotkeys. Quickly determine discounts, original prices, and more, ideal for shopping or financial planning.

Highlights
  • Percentage off a value
  • Percentage of a value
  • Percentage on a value
  • Calculate original price
  • Large input buttons
  • Hotkeys for quick selection
Read full description

Devalluator is a neat little app designed to make calculating percentages fast and simple. It uses large buttons to input values and hot keys to let you select the percentage you want to apply to a figure. Ideal for shopping environments when you just want to quickly find out the discount on that special pair of shoes and not wast time fiddling about with small buttons and complicated functions. The app can perform 5 percentage functions: -Percentage off a value -Percentage of a value -Percentage on a value -Original price before percentage was increased -Original price before percentage was reduced

About

Rapid & Quick Calculator Pro

This calculator app offers essential functions plus advanced features like sales tax and discount calculations. Easily reuse past answers, edit expressions with cursor keys, and customize themes and fonts. Share your calculations with others.

Highlights
  • History tape for reusing answers
  • Sales tax and discount calculations
  • Precise rounding settings
  • Editable expressions with cursor keys
  • Multiple color themes and font options
  • Share expressions and answers
Features
Read full description

Over 300,000 downloads worldwide! A fast, friendly calculator built for everyday use — shopping, splitting bills, household budgeting, and more. FEATURES * History Tape — review your past calculations and reuse any answer with a single tap * Expression Input — type the whole equation, just like you'd write it on paper * Sales Tax — toggle tax-included/excluded with a single button; swipe to switch between multiple tax rates * Percentage Discounts — e.g. 100 - 30% = 70 * Precise Rounding Settings * Multiple Color Themes * Multiple Font Sizes and Typefaces * Arrow Keys — move the cursor left or right to edit any part of the expression * Share — send expressions and answers to other apps * iPad Support — including Slide Over and Split View on supported devices * Sound Effects To reuse or edit an equation from your history, swipe left on it (or touch and hold) to open the menu. We'd love to hear your feedback!

Screenshots

Devalluator Calculation Tool4 screens
Rapid & Quick Calculator Pro4 screens

Verdict

The call

The clearest difference is ads: Devalluator Calculation Tool at none against Rapid & Quick Calculator Pro's shown. Devalluator Calculation Tool also leads on price ($0.99 vs $3.99) and device support (4 vs 2). Rapid & Quick Calculator Pro's advantage is ratings volume (205 vs 1) and update cadence (every 5 months vs every 10 months). On rating, in-app purchases and monetization model 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

Devalluator Calculation Tool costs $0.99 and Rapid & Quick Calculator Pro $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Devalluator Calculation Tool against 4.9 for Rapid & Quick Calculator Pro. That said, the two scores are not equally well evidenced: Rapid & Quick Calculator Pro has 205 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Devalluator Calculation Tool ships an update every 10 months, Rapid & Quick Calculator Pro every 5 months. The most recent releases landed on June 25, 2026 and September 26, 2026 respectively.

Scorecard6 real differences · 4 level
Devalluator Calculation Tool versus Rapid & Quick Calculator Pro: the parameters behind the verdict, then further details
ParameterDevalluator Calculation ToolRapid & Quick Calculator Pro
Price$0.99 — better$3.99
Rating5.0 (1 ratings) — better4.9 (205 ratings)
Positive reviews—90.1% of reviews
Number of ratings1205 — better
Update frequencyEvery 10 monthsEvery 5 months — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS11.0 — better17.6
Further details — not scored
Size8 MB7 MB
Age rating4+4+
DeveloperJohn BensonKinkumaDesign

Customer experience

Devalluator Calculation Tool

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Rapid & Quick Calculator Pro

All ratings205 ratings
Positive98.5%
Neutral1.0%
Negative0.5%
Written reviews101 reviews
Positive90.1%
Neutral7.9%
Negative2.0%

Bugs and requests

Devalluator Calculation Tool

Not enough reviews yet to summarise bugs or requests.

Rapid & Quick Calculator Pro

Reported bugs

8 issues
  • App crashes when pasting copied expression and pressing equals
  • Random calculations appear in current box after clearing and reopening
  • Laggy drawing of input on startup
  • App becomes unusable on iPad after screen switching
  • Swipe response is poor
Show 3 more
  • Sound effects stopped working despite being enabled
  • History is lost when switching to background and returning
  • Paid version tax buttons are not functional

Requested features

11 requests
  • Dark mode for icon
  • Larger calculation display window
  • Separate tax buttons (pre/post tax)
  • Vibration option for input
  • Add memo to history
Show 6 more
  • Sort history by newest
  • Button for billions/ten millions
  • Square root function
  • Setting for decimal places
  • Setting for decimal marks
  • Continuous calculation without equals

In-app purchases

None

Devalluator Calculation Tool

No in-app purchases

None

Rapid & Quick Calculator Pro

No in-app purchases

Questions

Is Devalluator Calculation Tool free?
Devalluator Calculation Tool costs $0.99, with no in-app purchases.
Is Rapid & Quick Calculator Pro free?
Rapid & Quick Calculator Pro costs $3.99, with no in-app purchases.
Which has better reviews, Devalluator Calculation Tool or Rapid & Quick Calculator Pro?
Devalluator Calculation Tool is rated higher. Devalluator Calculation Tool averages 5.0 out of 5 from 1 ratings, while Rapid & Quick Calculator Pro averages 4.9 from 205 ratings.
Do Devalluator Calculation Tool or Rapid & Quick Calculator Pro have ads?
Rapid & Quick Calculator Pro shows ads; Devalluator Calculation Tool does not.
Which is updated more often, Devalluator Calculation Tool or Rapid & Quick Calculator Pro?
Devalluator Calculation Tool ships an update every 10 months, and Rapid & Quick Calculator Pro every 5 months. Most recently, Devalluator Calculation Tool was updated on June 25, 2026 and Rapid & Quick Calculator Pro on September 26, 2026.

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