# Only One Calculator vs WonderCalc

The clearest difference is rating: Only One Calculator at 5.0 against WonderCalc's 4.7. Only One Calculator also leads on iOS requirement (11.0 vs 16.0). WonderCalc's advantage is update cadence (every 5 days vs every 2 weeks). On price, review sentiment, ratings volume and ads 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 holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Only One Calculator ships an update every 2 weeks, WonderCalc every 5 days. Both last shipped on November 3, 2026.

## The numbers

| Metric | Only One Calculator | WonderCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/only-one-calculator/id1488596497/reviews)** | [4.7 (3 ratings)](https://appshunter.io/ios/app/wondercalc/id6444459924/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | Free | Free |
| Size | 34 MB | 5 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jia Hua Huang](https://appshunter.io/developer/1488596496) | [SharkMonkey Apps](https://appshunter.io/developer/1654824300) |

## 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


### WonderCalc

[App page](https://appshunter.io/ios/app/wondercalc/id6444459924)

This utility app handles all your basic calculation needs, including unit conversions for length, weight, and temperature. It also offers advanced financial calculations for loans, such as monthly payments, total cost, and interest paid.

**Highlights:** Basic calculations, Cut, copy, and paste functionality, Unit conversions (length, weight, temperature), Loan payment calculations, Total loan cost and interest calculation

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

**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 WonderCalc free?

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

### Which has better reviews, Only One Calculator or WonderCalc?

Only One Calculator is rated higher. Only One Calculator averages 5.0 out of 5 from 2 ratings, while WonderCalc averages 4.7 from 3 ratings.

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

Neither Only One Calculator nor WonderCalc shows ads.

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

Only One Calculator ships an update every 2 weeks, and WonderCalc every 5 days. Most recently, Only One Calculator was updated on November 3, 2026 and WonderCalc on November 3, 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.*