# Calculator vs Refuel Buddy

The clearest difference is price: Calculator at Free against Refuel Buddy's $1.99. Calculator also leads on update cadence (every 3 weeks vs every 22 months) and iOS requirement (12.0 vs 15.1). Refuel Buddy's advantage is in-app purchases (none vs 2). On ads and device support there is nothing between them.

Calculator is free to download; Refuel Buddy costs $1.99 up front. Calculator sells 2 one-off in-app purchases. Refuel Buddy asks for nothing beyond the download.

Calculator ships an update every 3 weeks, Refuel Buddy every 22 months. The most recent releases landed on October 18, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Calculator | Refuel Buddy |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/calculator-currency-unit/id1583572133/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 22 months |
| Monetization | Free with in-app purchases | — |
| Size | 19 MB | 6 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [hua-shan cheng](https://appshunter.io/developer/1019388170) | [htin kyaw](https://appshunter.io/developer/1727112077) |

## What reviewers say

### Calculator

[App page](https://appshunter.io/ios/app/calculator-currency-unit/id1583572133)

This versatile tool combines a scientific calculator with currency and unit conversion capabilities. It offers a history manager, full editing options, and an intuitive interface for school, work, and daily tasks. Supports offline currency conversion.

**Highlights:** Scientific calculator functions, Currency converter with 37 currencies, Unit converter with 181 units, History manager for calculations, Offline currency conversion, Full editing options (undo/redo)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock iPad Landscape | $0.99 | one-time |
| Unlock History | $0.99 | one-time |


### Refuel Buddy

[App page](https://appshunter.io/ios/app/refuel-buddy/id6477700959)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calculator free?

Calculator is free to download, with in-app purchases available.

### Is Refuel Buddy free?

Refuel Buddy costs $1.99, with no in-app purchases.

### Do Calculator or Refuel Buddy have ads?

Neither Calculator nor Refuel Buddy shows ads.

### Which is updated more often, Calculator or Refuel Buddy?

Calculator ships an update every 3 weeks, and Refuel Buddy every 22 months. Most recently, Calculator was updated on October 18, 2026 and Refuel Buddy on October 25, 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.*