FCD vs GateRelay
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FCD
This application calibrates engine gauges for turboprop aircraft using an iPad. It connects via Bluetooth to a specialized adapter plugged into the back of the gauges, allowing full control of calibration parameters and download of flight log data.
- iPad-based calibration
- Bluetooth connectivity
- Control calibration parameters
- Download flight log data
- Supports TR1 engine gauges
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iPad based calibration app for the Electronics International Inc line of Turboprop 2 inch round engine gauges. The FCD-TR1 adapter is a BLE (BlueTooth) device that can be plugged directly into the back of any of the TR1 instruments and then controlled by this app via a BLE (BlueTooth) connection. All calibration parameters of the TR1 are accessible via this app. In addition, recorded flight log data can be downloaded to the iPad.
GateRelay
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Take control of your gates, barriers, and shutters with GateRelay. GateRelay is a smart and simple control app that helps you manage compatible GSM gate controllers in one place. Open devices quickly, manage access, adjust settings, and keep important actions easy to review. With GateRelay, you can: • Open gates, barriers, and roller shutters quickly • Manage multiple compatible devices in one app • Control user access with admin and user views • Add, edit, and organize device users • Adjust device settings and operational behavior • Review recent activity and device logs • Use smart arrival reminders with geofence alerts • Tap the arrival notification to open your gate instantly Supported RTU models: • RTU5015 • RTU5015 Plus • RTU5024 • RTU5025 • RTU5034 Whether you are managing access for your home, office, parking barrier, or shutter installation, GateRelay helps make GSM gate control faster, smarter, and easier. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: FCD at none against GateRelay's 1. GateRelay's advantage is update cadence (every 9 days vs every 7 months). On price, ads, device support and iOS requirement 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. GateRelay sells 1 one-off in-app purchase. FCD asks for nothing beyond the download.
FCD ships an update every 7 months, GateRelay every 9 days. The most recent releases landed on September 8, 2026 and September 14, 2026 respectively.
| Parameter | FCD | GateRelay |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 7 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.4 — better | 15.0 |
| Further details — not scored | ||
| Size | 2 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Ross Morrison | George Alexandrou |
In-app purchases
FCD
No in-app purchases
GateRelay
- GateRelay Pro$9.99









