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.
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.
- Percentage off a value
- Percentage of a value
- Percentage on a value
- Calculate original price
- Large input buttons
- Hotkeys for quick selection
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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
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | Devalluator Calculation Tool | Rapid & Quick Calculator Pro |
|---|---|---|
| Price | $0.99 — better | $3.99 |
| Rating | 5.0 (1 ratings) — better | 4.9 (205 ratings) |
| Positive reviews | — | 90.1% of reviews |
| Number of ratings | 1 | 205 — better |
| Update frequency | Every 10 months | Every 5 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 11.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 8 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | John Benson | KinkumaDesign |
Customer experience
Devalluator Calculation Tool
Rapid & Quick Calculator Pro
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
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- 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
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- 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
Devalluator Calculation Tool
No in-app purchases
Rapid & Quick Calculator Pro
No in-app purchases
Questions
Is Devalluator Calculation Tool free?
Is Rapid & Quick Calculator Pro free?
Which has better reviews, Devalluator Calculation Tool or Rapid & Quick Calculator Pro?
Do Devalluator Calculation Tool or Rapid & Quick Calculator Pro have ads?
Which is updated more often, Devalluator Calculation Tool or Rapid & Quick Calculator Pro?
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