# TinyWatchCalc vs Only One Calculator

The clearest difference is update cadence: Only One Calculator at every 2 weeks against TinyWatchCalc's every 16 months. 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.

TinyWatchCalc ships an update every 16 months, Only One Calculator every 2 weeks. The most recent releases landed on September 28, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | TinyWatchCalc | Only One 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 16 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 9 MB | 34 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Peter Entwistle](https://appshunter.io/developer/955246260) | [Jia Hua Huang](https://appshunter.io/developer/1488596496) |

## What reviewers say

### TinyWatchCalc

[App page](https://appshunter.io/ios/app/tinywatchcalc/id1030102319)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is TinyWatchCalc free?

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

### Is Only One Calculator free?

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

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

Neither TinyWatchCalc nor Only One Calculator shows ads.

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

TinyWatchCalc ships an update every 16 months, and Only One Calculator every 2 weeks. Most recently, TinyWatchCalc was updated on September 28, 2026 and Only One Calculator on October 7, 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.*