# Calta vs 電卓　水色

The clearest difference is update cadence: Calta at every 3 days against 電卓　水色's every 23 months. Calta also leads on iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Calta ships an update every 3 days, 電卓　水色 every 23 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Calta | 電卓　水色 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Every 23 months |
| Monetization | Ad-supported | — |
| Size | 23 MB | 19 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hiroki Oka](https://appshunter.io/developer/1464653539) | [kota tada](https://appshunter.io/developer/1658942612) |

## What reviewers say

### Calta

[App page](https://appshunter.io/ios/app/calta/id1499265833)

This calculator app offers advanced features like equation display, calculation history, and redo/undo functionality for easier use. Customize backgrounds and button shapes, and perform tax calculations with adjustable rates. It supports up to 20 digits and respects order of operations.

**Highlights:** Equation display, Calculation history, Redo and Undo functions, Customizable background, Customizable button shape, Tax calculation, Order of operations support

**Features:** macOS Compatibility

**In-app purchases:** none


### 電卓　水色

[App page](https://appshunter.io/ios/app/id1658942610)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calta free?

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

### Is 電卓　水色 free?

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

### Do Calta or 電卓　水色 have ads?

Both Calta and 電卓　水色 show ads.

### Which is updated more often, Calta or 電卓　水色?

Calta ships an update every 3 days, and 電卓　水色 every 23 months. Most recently, Calta was updated on October 29, 2026 and 電卓　水色 on October 30, 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.*