# FCD vs White Lightning SmartGPU

The clearest difference is update cadence: White Lightning SmartGPU at every 3 months against FCD's every 7 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

FCD ships an update every 7 months, White Lightning SmartGPU every 3 months. The most recent releases landed on October 9, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | FCD | White Lightning SmartGPU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fcd-tr1-adapter-application/id1438537309/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 2 MB | 37 MB |
| Requires iOS | 14.4 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ross Morrison](https://appshunter.io/developer/1438537308) | [Audio Authority](https://appshunter.io/developer/1089628227) |

## What reviewers say

### FCD

[App page](https://appshunter.io/ios/app/fcd-tr1-adapter-application/id1438537309)

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.

**Highlights:** iPad-based calibration, Bluetooth connectivity, Control calibration parameters, Download flight log data, Supports TR1 engine gauges

**Features:** macOS Compatibility

**In-app purchases:** none


### White Lightning SmartGPU

[App page](https://appshunter.io/ios/app/white-lightning-smartgpu/id6503616986)

**In-app purchases:** none


## Frequently asked questions

### Is FCD free?

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

### Is White Lightning SmartGPU free?

White Lightning SmartGPU is free to download, with no in-app purchases.

### Do FCD or White Lightning SmartGPU have ads?

Neither FCD nor White Lightning SmartGPU shows ads.

### Which is updated more often, FCD or White Lightning SmartGPU?

FCD ships an update every 7 months, and White Lightning SmartGPU every 3 months. Most recently, FCD was updated on October 9, 2026 and White Lightning SmartGPU on October 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*