# CalKeyboard vs 青蛙發票王

The clearest difference is in-app purchases: 青蛙發票王 at none against CalKeyboard's 1. 青蛙發票王 also leads on update cadence (every 5 days vs every 8 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. CalKeyboard sells 1 one-off in-app purchase. 青蛙發票王 asks for nothing beyond the download.

CalKeyboard ships an update every 8 months, 青蛙發票王 every 5 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | CalKeyboard | 青蛙發票王 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (5 ratings)](https://appshunter.io/ios/app/calkeyboard/id1269400175/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 2 MB | 9 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FebesGoods Studio](https://appshunter.io/developer/597141225) | [至簡科技有限公司](https://appshunter.io/developer/6802671204) |

## What reviewers say

### CalKeyboard

[App page](https://appshunter.io/ios/app/calkeyboard/id1269400175)

This keyboard app integrates a calculator directly into your typing experience. Perform calculations without leaving your current application. It's designed for quick math needs while messaging or working.

**Highlights:** Integrated calculator, Type and calculate simultaneously, Seamless integration, Quick calculations

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $0.99 | one-time |


### 青蛙發票王

[App page](https://appshunter.io/ios/app/id6803553469)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CalKeyboard free?

CalKeyboard is free to download, with in-app purchases available.

### Is 青蛙發票王 free?

青蛙發票王 is free to download, with no in-app purchases.

### Do CalKeyboard or 青蛙發票王 have ads?

Neither CalKeyboard nor 青蛙發票王 shows ads.

### Which is updated more often, CalKeyboard or 青蛙發票王?

CalKeyboard ships an update every 8 months, and 青蛙發票王 every 5 days. Most recently, CalKeyboard was updated on November 3, 2026 and 青蛙發票王 on October 31, 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.*