# Only One Calculator vs Multi Calculator

The clearest difference is update cadence: Multi Calculator at daily against Only One Calculator's every 2 weeks. Only One Calculator's advantage is iOS requirement (11.0 vs 17.0). 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.

Only One Calculator ships an update every 2 weeks, Multi Calculator daily. The most recent releases landed on June 3, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Only One Calculator | Multi Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/only-one-calculator/id1488596497/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Daily** |
| Monetization | Free | — |
| Size | 34 MB | 5 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jia Hua Huang](https://appshunter.io/developer/1488596496) | [忆倩 刘](https://appshunter.io/developer/1492807169) |

## What reviewers say

### Only One Calculator

[App page](https://appshunter.io/ios/app/only-one-calculator/id1488596497)

This utility app offers instant currency exchange and unit conversions, making it ideal for travel and shopping. It features undo/redo functionality for easy editing and supports over 160 currencies with customizable update frequencies.  Users can also access calculation history and customize the keyboard.

**Highlights:** Instant currency exchange, Unit conversion (length, weight, area, volume, temperature), Undo/Redo functionality, History of calculations, Customizable keyboard layout, Real-time calculation results

**In-app purchases:** none


### Multi Calculator

[App page](https://appshunter.io/ios/app/multi-calculator/id6477789604)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Only One Calculator free?

Only One Calculator is free to download, with no in-app purchases.

### Is Multi Calculator free?

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

### Do Only One Calculator or Multi Calculator have ads?

Neither Only One Calculator nor Multi Calculator shows ads.

### Which is updated more often, Only One Calculator or Multi Calculator?

Only One Calculator ships an update every 2 weeks, and Multi Calculator daily. Most recently, Only One Calculator was updated on June 3, 2026 and Multi Calculator on September 9, 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.*