# Happay vs Rapid & Quick Calculator Pro

The clearest difference is price: Happay at Free against Rapid & Quick Calculator Pro's $3.99. Happay also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 5 months). Rapid & Quick Calculator Pro's advantage is chart position (#198 vs unranked). On in-app purchases and device support there is nothing between them.

Happay is free to download; Rapid & Quick Calculator Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Happay ships an update every 3 weeks, Rapid & Quick Calculator Pro every 5 months. The most recent releases landed on October 24, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Happay | Rapid & Quick Calculator Pro |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | — | **[4.9 (206 ratings)](https://appshunter.io/ios/app/rapid-and-quick-calculator-pro/id1067631562/reviews)** |
| Number of ratings | — | **206** |
| Positive reviews | — | 90.1% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 5 months |
| Monetization | — | Paid |
| Best chart rank | — | **#198** |
| Size | 94 MB | 7 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shanghai Galaxy Information & Technology Co., Ltd.](https://appshunter.io/developer/888976561) | [KinkumaDesign](https://appshunter.io/developer/385697725) |

## What reviewers say

### Happay

[App page](https://appshunter.io/ios/app/happay/id1064300623)

**Features:** Vision Pro support

**In-app purchases:** none


### Rapid & Quick Calculator Pro

[App page](https://appshunter.io/ios/app/rapid-and-quick-calculator-pro/id1067631562)

**Currently charting:** #198 Top Paid · Finance (US App Store)

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:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 📜 History feature is helpful
- 📋 Copy and paste functionality
- ✨ Customizable appearance
- ✅ Clear display of calculations

**What reviewers complain about**

- 🐛 App crashes on paste
- 🐛 Random calculations appear
- 🐛 Laggy input on startup
- 🐛 iPad bug with screen switching
- 🐛 Swipe responsiveness issues

**Reported bugs**

- 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

**Requested features**

- Dark mode for icon
- Larger calculation display window
- Separate tax buttons (pre/post tax)
- Vibration option for input
- Add memo to history


## Frequently asked questions

### Is Happay free?

Happay is free to download, with no in-app purchases.

### Is Rapid & Quick Calculator Pro free?

Rapid & Quick Calculator Pro costs $3.99, with no in-app purchases.

### Do Happay or Rapid & Quick Calculator Pro have ads?

Rapid & Quick Calculator Pro shows ads; Happay does not.

### Which is updated more often, Happay or Rapid & Quick Calculator Pro?

Happay ships an update every 3 weeks, and Rapid & Quick Calculator Pro every 5 months. Most recently, Happay was updated on October 24, 2026 and Rapid & Quick Calculator Pro on November 2, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*