# MachDB vs E6B Slide Rule

The clearest difference is price: MachDB at Free against E6B Slide Rule's $2.99. E6B Slide Rule's advantage is chart position (#53 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

MachDB 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 | MachDB | E6B Slide Rule |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/machdb/id6757681004/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Monetization | Free | — |
| Best chart rank | — | **#53** |
| Size | 16 MB | 2 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [MachDB LLC](https://appshunter.io/developer/1868240819) | [Western Chancellor LLC](https://appshunter.io/developer/6810377018) |

## What reviewers say

### MachDB

[App page](https://appshunter.io/ios/app/machdb/id6757681004)

Easily download and transfer Garmin avionics database updates to an SD card using your iPhone or iPad. This app supports a wide range of Garmin avionics and requires only a standard USB-C SD card reader. Updates are fast and convenient for field use.

**Highlights:** Download Garmin database updates, Transfer updates to SD card, iPhone and iPad compatible, Supports various Garmin avionics, Uses standard USB-C SD card reader, Fast Wi-Fi/Cellular downloads

**In-app purchases:** none


### E6B Slide Rule

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

**Currently charting:** #53 Top Paid · Utilities (US App Store)

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

**In-app purchases:** none


## Frequently asked questions

### Is MachDB free?

MachDB 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 MachDB or E6B Slide Rule have ads?

Neither MachDB 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.*