FlyHJ Sync vs MachDB
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FlyHJ Sync
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**FlyHJ Sync** - Transfer aircraft data from your HondaJet's Garmin G3000 SD card directly to FlyHJ servers using your iPhone or iPad. **For HondaJet Operators Only** Requires an active FlyHJ aircraft support subscription. Streamline your monthly CMC data submissions and troubleshooting workflows with the fastest, most convenient transfer method available. **Key Features:** • **Smart File Transfer** - Automatically discovers and compresses flight data files for efficient upload • **Network Control** - Choose WiFi-only or cellular uploads based on your preferences • **Aircraft Management** - Select from your accessible aircraft fleet for accurate data association • **SD Card Cleanup** - Safely remove uploaded files while preserving essential system files • **Queue Management** - Files automatically queue for WiFi upload when on cellular networks **How It Works:** 1. Connect your Garmin G3000 SD card via adapter 2. Select your aircraft and let the app discover files 3. Choose your upload preferences and transfer 4. Optional cleanup removes processed files from your SD card **Perfect for:** - Monthly CMC data submission requirements - Sending diagnostic data to FlyHJ support teams - Flight data archiving and record-keeping **Requirements:** - iPhone/iPad with iOS 17.6+ - SD card adapter (USB-C or Lightning) - Active FlyHJ subscription
MachDB
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.
- 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
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MachDB allows you to download and transfer aviation database updates to an SD card or USB key in seconds using your iPhone or iPad for fast updates in the field. Supports Garmin, Avidyne, and Pro Line avionics. All you need is your iPhone or iPad and a standard USB-C SD card reader (for SD updates) or USB-A to C cable (for USB updates). No proprietary hardware required! Download updates fast over Wi-Fi or Cellular connections. MachDB is compatible with all modern Garmin, Avidyne, and Pro Line avionics, using your existing Jeppesen or Garmin database account. No additional subscription or cost required. Supported avionics include: -Garmin G1000, G1000 Nxi, Perspective and Perspective + -Garmin G2000, G3000, G3X and Perspective Touch -Garmin Axis, G500, G600, G700, GTN 600 and 700 Xi -All other Garmin avionics using SD card or USB key for updates -Avidyne IFD, Vantage, and Entegra -Collins Pro Line 21 and Pro Line Fusion Supported Database Providers: -Jeppesen -Garmin
Screenshots
Verdict
The clearest difference is update cadence: FlyHJ Sync at weekly against MachDB's fortnightly. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
FlyHJ Sync ships an update weekly, MachDB fortnightly. The most recent releases landed on September 29, 2026 and October 25, 2026 respectively.
| Parameter | FlyHJ Sync | MachDB |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.3 (6 ratings) — better |
| Positive reviews | — | 66.7% of reviews |
| Number of ratings | — | 6 — better |
| Update frequency | Weekly — better | Fortnightly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Carson Lee | MachDB LLC |
In-app purchases
FlyHJ Sync
No in-app purchases
MachDB
No in-app purchases









