# Calta vs RedoCalc

The clearest difference is iOS requirement: Calta at 11.0 against RedoCalc's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on June 4, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Calta | RedoCalc |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 3 days | Every 3 days |
| Monetization | Ad-supported | — |
| Size | 23 MB | 3 MB |
| Requires iOS | **11.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hiroki Oka](https://appshunter.io/developer/1464653539) | [Toshiyuki Kuwabara](https://appshunter.io/developer/1649322074) |

## 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


### RedoCalc

[App page](https://appshunter.io/ios/app/redocalc/id6743318834)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calta free?

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

### Is RedoCalc free?

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

### Do Calta or RedoCalc have ads?

Both Calta and RedoCalc show ads.

### Which is updated more often, Calta or RedoCalc?

Calta ships an update every 3 days, and RedoCalc every 3 days. Most recently, Calta was updated on June 4, 2026 and RedoCalc on September 8, 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.*