# Simple Units Converter vs Viscosity Conversion

The clearest difference is update cadence: Simple Units Converter at every 8 months against Viscosity Conversion's every 30 months. Simple Units Converter also leads on price ($0.99 vs $2.99). Viscosity Conversion's advantage is iOS requirement (13 vs 16.2). On ads, in-app purchases and device support there is nothing between them.

Simple Units Converter costs $0.99 and Viscosity Conversion $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Simple Units Converter ships an update every 8 months, Viscosity Conversion every 30 months. The most recent releases landed on August 8, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Simple Units Converter | Viscosity Conversion |
| --- | --- | --- |
| Price | **$0.99** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 30 months |
| Size | 9 MB | 1 MB |
| Requires iOS | 16.2 | **13** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mind Trends LLC](https://appshunter.io/developer/582509215) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### Simple Units Converter

[App page](https://appshunter.io/ios/app/simple-units-converter/id599423731)

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

**In-app purchases:** none


### Viscosity Conversion

[App page](https://appshunter.io/ios/app/viscosity-conversion/id630288155)

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

**In-app purchases:** none


## Frequently asked questions

### Is Simple Units Converter free?

Simple Units Converter costs $0.99, with no in-app purchases.

### Is Viscosity Conversion free?

Viscosity Conversion costs $2.99, with no in-app purchases.

### Do Simple Units Converter or Viscosity Conversion have ads?

Neither Simple Units Converter nor Viscosity Conversion shows ads.

### Which is updated more often, Simple Units Converter or Viscosity Conversion?

Simple Units Converter ships an update every 8 months, and Viscosity Conversion every 30 months. Most recently, Simple Units Converter was updated on August 8, 2026 and Viscosity Conversion on October 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.*