# Viscosity Conversion vs Assalub Oil Viscosity App

The clearest difference is iOS requirement: Viscosity Conversion at 13 against Assalub Oil Viscosity App's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Viscosity Conversion costs $2.99 and Assalub Oil Viscosity App $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Viscosity Conversion ships an update every 30 months, Assalub Oil Viscosity App every 17 months. The most recent releases landed on October 29, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Viscosity Conversion | Assalub Oil Viscosity App |
| --- | --- | --- |
| Price | $2.99 | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 30 months | **Every 17 months** |
| Size | 1 MB | 31 MB |
| Requires iOS | **13** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Assalub AB](https://appshunter.io/developer/1676622489) |

## What reviewers say

### Viscosity Conversion

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

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

**In-app purchases:** none


### Assalub Oil Viscosity App

[App page](https://appshunter.io/ios/app/assalub-oil-viscosity-app/id6446201875)

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

**In-app purchases:** none


## Frequently asked questions

### Is Viscosity Conversion free?

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

### Is Assalub Oil Viscosity App free?

Assalub Oil Viscosity App costs $2.99, with no in-app purchases.

### Do Viscosity Conversion or Assalub Oil Viscosity App have ads?

Neither Viscosity Conversion nor Assalub Oil Viscosity App shows ads.

### Which is updated more often, Viscosity Conversion or Assalub Oil Viscosity App?

Viscosity Conversion ships an update every 30 months, and Assalub Oil Viscosity App every 17 months. Most recently, Viscosity Conversion was updated on October 29, 2026 and Assalub Oil Viscosity App 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.*