# MachDB vs Aviator Watch E6B Slide Rule

The clearest difference is price: MachDB at Free against Aviator Watch E6B Slide Rule's $2.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

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

MachDB ships an update fortnightly, Aviator Watch E6B Slide Rule every 3 weeks. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | MachDB | Aviator Watch E6B Slide Rule |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/machdb/id6757681004/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Free | — |
| Size | 18 MB | 3 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


### Aviator Watch E6B Slide Rule

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

**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 Aviator Watch E6B Slide Rule free?

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

### Do MachDB or Aviator Watch E6B Slide Rule have ads?

Neither MachDB nor Aviator Watch E6B Slide Rule shows ads.

### Which is updated more often, MachDB or Aviator Watch E6B Slide Rule?

MachDB ships an update fortnightly, and Aviator Watch E6B Slide Rule every 3 weeks. Most recently, MachDB was updated on October 25, 2026 and Aviator Watch E6B Slide Rule on October 29, 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.*