# Vantrue Thermal vs E6B Slide Rule

The clearest difference is price: Vantrue Thermal at Free against E6B Slide Rule's $2.99. Vantrue Thermal also leads on iOS requirement (12.0 vs 17.0). E6B Slide Rule's advantage is chart position (#153 vs unranked). On ads, in-app purchases and device support there is nothing between them.

Vantrue Thermal is free to download; E6B Slide Rule costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Vantrue Thermal | E6B Slide Rule |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Best chart rank | — | **#153** |
| Size | 33 MB | 2 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Shancai Caifu Management Co.Ltd](https://appshunter.io/developer/1345858075) | [Western Chancellor LLC](https://appshunter.io/developer/6810377018) |

## What reviewers say

### Vantrue Thermal

[App page](https://appshunter.io/ios/app/vantrue-thermal/id6752274474)

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

**In-app purchases:** none


### E6B Slide Rule

[App page](https://appshunter.io/ios/app/e6b-slide-rule/id6810376836)

**Currently charting:** #153 Top Paid · Utilities (US App Store)

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

**In-app purchases:** none


## Frequently asked questions

### Is Vantrue Thermal free?

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

### Is E6B Slide Rule free?

E6B Slide Rule costs $2.99, with no in-app purchases.

### Do Vantrue Thermal or E6B Slide Rule have ads?

Neither Vantrue Thermal nor E6B Slide Rule shows ads.

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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.*