# KeyLinker vs GPchecker

The clearest difference is review sentiment: GPchecker at 85% against KeyLinker's 30%. GPchecker also leads on rating (4.5 vs 2.3). KeyLinker's advantage is ads (none vs shown) and update cadence (every 2 months vs every 17 months). On price, 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.

GPchecker holds the better App Store score, 4.5 against 2.3. Both are backed by a comparable volume of ratings — 49 and 15 respectively. Written reviews point the same way: 30% of KeyLinker's written reviews are positive against 85% of GPchecker's.

KeyLinker ships an update every 2 months, GPchecker every 17 months. The most recent releases landed on October 7, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | KeyLinker | GPchecker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (49 ratings)](https://appshunter.io/ios/app/keylinker/id1472490585/reviews) | **[4.5 (15 ratings)](https://appshunter.io/ios/app/gpchecker/id1478760995/reviews)** |
| Number of ratings | **49** | 15 |
| Positive reviews | 30.2% of reviews | **84.6% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 17 months |
| Monetization | **Free** | Ad-supported |
| Size | 38 MB | 4 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ShenZhen ZhiXu Technology Co., Ltd](https://appshunter.io/developer/1472490584) | [Paraches Lifestyle Lab.](https://appshunter.io/developer/379270827) |

## What reviewers say

### KeyLinker

[App page](https://appshunter.io/ios/app/keylinker/id1472490585)

Customize and enhance your controller experience with this utility app. Modify parameters for keys, lighting, vibration, and more to suit your personal preferences. Enjoy a more personalized and responsive gaming setup.

**Highlights:** Modify key parameters, Customize lamplight settings, Adjust vibration feedback, Configure joystick and trigger, Simultaneous device connection

**Features:** Vision Pro support

**In-app purchases:** none


### GPchecker

[App page](https://appshunter.io/ios/app/gpchecker/id1478760995)

This utility app helps you test the functionality of game controllers connected to your iPhone. It allows you to verify the input values for sticks, triggers, and buttons, ensuring they are working correctly.

**Highlights:** Test gamepad sticks, Test gamepad triggers, Test gamepad buttons, Check input values, Verify controller function

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is KeyLinker free?

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

### Is GPchecker free?

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

### Which has better reviews, KeyLinker or GPchecker?

GPchecker is rated higher. KeyLinker averages 2.3 out of 5 from 49 ratings, while GPchecker averages 4.5 from 15 ratings.

### Do KeyLinker or GPchecker have ads?

GPchecker shows ads; KeyLinker does not.

### Which is updated more often, KeyLinker or GPchecker?

KeyLinker ships an update every 2 months, and GPchecker every 17 months. Most recently, KeyLinker was updated on October 7, 2026 and GPchecker on September 21, 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.*