# Viscosity Conversion vs E

The clearest difference is price: E at Free against Viscosity Conversion's $2.99. E also leads on update cadence (weekly vs every 30 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

E is free to download; Viscosity Conversion costs $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, E weekly. The most recent releases landed on October 9, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Viscosity Conversion | E |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 30 months | **Weekly** |
| Size | 1 MB | 76 MB |
| Requires iOS | 13 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [LITE-ON TECHNOLOGY CORP.](https://appshunter.io/developer/511806419) |

## 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


### E

[App page](https://appshunter.io/ios/app/e-on-mobile/id6444123287)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Viscosity Conversion free?

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

### Is E free?

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

### Do Viscosity Conversion or E have ads?

Neither Viscosity Conversion nor E shows ads.

### Which is updated more often, Viscosity Conversion or E?

Viscosity Conversion ships an update every 30 months, and E weekly. Most recently, Viscosity Conversion was updated on October 9, 2026 and E on October 4, 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.*