# FCD vs ChatPro4

The clearest difference is in-app purchases: FCD at none against ChatPro4's 3. FCD also leads on ads (none vs shown). ChatPro4's advantage is update cadence (every 3 weeks vs every 7 months). On price, rating, ratings volume and device support there is nothing between them.

Both are free to download. ChatPro4 sells 3 in-app purchases, starting at $4.99 per 7 days. FCD asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for FCD against 5.0 for ChatPro4. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

FCD ships an update every 7 months, ChatPro4 every 3 weeks. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | FCD | ChatPro4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/fcd-tr1-adapter-application/id1438537309/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/chatpro4-ai-chatbot/id6472479300/reviews) |
| Number of ratings | 1 | **2** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 17 MB |
| Requires iOS | 14.4 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Ross Morrison](https://appshunter.io/developer/1438537308) | [Qijie Information](https://appshunter.io/developer/1717060398) |

## 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


### ChatPro4

[App page](https://appshunter.io/ios/app/chatpro4-ai-chatbot/id6472479300)

Engage in natural conversations with an AI assistant for advice, information, and creative tasks. It offers writing assistance, translation, planning, and programming help, powered by an advanced AI model with vision and speech-to-text capabilities.

**Highlights:** Advanced AI model (4.0), Vision modeling for picture conversations, Speech-to-text for efficiency, Streaming output for reduced waiting, Role-playing and dialog scenarios, Contextualization and multi-line switching

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Plus | $4.99 | per 7 days |
| Monthly Plus | $11.90 | per month |
| Annual Plus | $89.99 | per year |


## Frequently asked questions

### Is FCD free?

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

### Is ChatPro4 free?

ChatPro4 is free to download, with in-app purchases available.

### Which has better reviews, FCD or ChatPro4?

FCD and ChatPro4 are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do FCD or ChatPro4 have ads?

ChatPro4 shows ads; FCD does not.

### Which is updated more often, FCD or ChatPro4?

FCD ships an update every 7 months, and ChatPro4 every 3 weeks. Most recently, FCD was updated on November 2, 2026 and ChatPro4 on November 4, 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.*