# Conversion Calculator vs Duty+

The clearest difference is in-app purchases: Duty+ at none against Conversion Calculator's 1. Duty+ also leads on update cadence (every 2 weeks vs every 5 weeks). Conversion Calculator's advantage is device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Conversion Calculator sells 1 one-off in-app purchase. Duty+ asks for nothing beyond the download.

Conversion Calculator ships an update every 5 weeks, Duty+ every 2 weeks. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Conversion Calculator | Duty+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (157 ratings)](https://appshunter.io/ios/app/conversion-calculator-metric/id6468678523/reviews)** | — |
| Number of ratings | **157** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 3 MB |
| Requires iOS | **17.0** | 17.5 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Collins Cheruiyot](https://appshunter.io/developer/1579009978) | [Sim2Sky Ltd](https://appshunter.io/developer/6787638798) |

## What reviewers say

### Conversion Calculator

[App page](https://appshunter.io/ios/app/conversion-calculator-metric/id6468678523)

Easily convert between metric and imperial units for weight, length, temperature, area, and time. This app offers precise, fast results with a clean interface, working offline for daily, travel, school, or work needs.

**Highlights:** Metric and imperial unit conversion, Weight, length, temperature, area, time, Offline functionality, Precise and fast results, Clean and minimal interface, Over 100 measurement types

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited access forever | $8.99 | one-time |


### Duty+

[App page](https://appshunter.io/ios/app/duty-plus/id6787638796)

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

**In-app purchases:** none


## Frequently asked questions

### Is Conversion Calculator free?

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

### Is Duty+ free?

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

### Do Conversion Calculator or Duty+ have ads?

Neither Conversion Calculator nor Duty+ shows ads.

### Which is updated more often, Conversion Calculator or Duty+?

Conversion Calculator ships an update every 5 weeks, and Duty+ every 2 weeks. Most recently, Conversion Calculator was updated on October 14, 2026 and Duty+ on October 11, 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.*