KeyX Switch

KeyX
General
Author	TOM-BadEN
Type	Overlays
Version	1.1.6
License	GPL-3.0
Last Updated	2025/11/06
Links
Download
Website
Source

KeyX is a Nintendo Switch button assistant that supports turbo (rapid fire) and key remapping functionalities. It features a modern Tesla overlay UI, allowing dynamic modification of turbo and mapping settings, along with optional notification popups. KeyX works globally or per game, with auto-start based on saved configurations.

Features

• Modern and beautiful Tesla overlay
• Dynamically modify turbo and mapping settings
• Optional modern UI notification popups

Key Mapping

• Remap 16 buttons (A/B/X/Y/L/R/ZL/ZR/D-pad/SELECT/START/L3/R3)
• Works together with turbo without conflicts
• Perfectly avoids system warning popups about button changes
• Global and per-game configuration
• Auto-remembers on/off state

Turbo

• Turbo for 12 buttons (A/B/X/Y/L/R/ZL/ZR/D-pad)
• Multiple buttons can turbo simultaneously
• Non-turbo buttons work normally during turbo
• Customizable press and release duration
• Global and per-game configuration
• Auto-remembers on/off state

Notice

• Key mapping works on all Switch models
• As of v1.1.6, turbo works on all Switch models
• Note: Turbo on JoyCon models may feel less smooth, but at least it works
• LITE models still have perfect turbo performance

Memory Usage

• System module: only 297 KB
• Notification popup: extra 688 KB
• Popup only uses memory when triggered

Installation

Copy files to SD card root:

/atmosphere/contents/4100000002025924/
/atmosphere/contents/0100000000251020
/switch/.overlays/ovl-KeyX.ovl

Multi-Language

• Chinese is hardcoded, no need to add
• I used AI to translate the English language file
• I don't understand other languages, and AI is even worse at it
• You can refer to en.json to add support for other languages

SUPPORTED LANGUAGES:
  - en.json       (English)
  - zh-cn.json    (No need to add, already hardcoded)
  - zh-tw.json    (Traditional Chinese)
  - ja.json       (Japanese)
  - ko.json       (Korean)
  - fr.json       (French)
  - de.json       (German)
  - it.json       (Italian)
  - es.json       (Spanish)
  - pt.json       (Portuguese)
  - ru.json       (Russian)
  - nl.json       (Dutch)

Screenshots

Changelog

v1.1.6

• Added turbo activation delay detection to prevent accidental triggering of the turbo function.
• The turbo function now supports all models.
• Optimized the smoothness of the turbo function on LITE models.
• Note: Due to underlying system limitations, multi-button turbo on JC controllers performs only moderately. I’ve tried my best. It works perfectly on LITE models.
• Fixes
  • Fixed a BUG where a buffer overflow could cause a crash.
  • Fixed a BUG where, in some cases, Tesla plugin IPC calls could cause a freeze.

v1.1.5

• Fixed a bug where the mapping feature could not work properly on non-LITE models in some cases.
• Changed the plugin’s configuration file path from /config/AutoKeyLoop to /config/KeyX.
• If you have been using this plugin before, you can manually update the configuration path to avoid losing your settings.
• Note
  • Remapping function works on all models
  • Turbo function still only works on LITE models
  • The CN and EN versions differ only in the Tesla overlay title; everything else is identical.

v1.1.4

• Tesla Ovl
  • Fixed a bug, where IPC communication failed when switching configurations, if both mapping and Turbo functions were disabled.
• Note
  • Remapping function works on all models
  • Turbo function still only works on LITE models
  • The CN and EN versions differ only in the Tesla overlay title; everything else is identical.

v1.1.3

• Added Button Remapping Feature
  • Supports remapping between 16 buttons (A/B/X/Y/L/R/ZL/ZR/D-Pad/SELECT/START/L3/R3)
  • Can be enabled simultaneously with turbo function without conflicts
  • Perfectly bypasses system warning popups about button modifications
  • Global configuration and per-game configuration
  • Automatically remembers on/off state
• Optimizations
  • Turbo threads merged from 2 into 1
  • Significant code optimization throughout the entire project
  • System module now only uses 297 KB of RAM
  • Turbo and remapping functions pause when game is switched to background
• Tesla Overlay
  • Tesla overlay has been significantly redesigned to accommodate the new remapping feature
  • Added reset function to turbo button settings
• Note
  • Remapping function works on all models
  • Turbo function still only works on LITE models
  • The CN and EN versions differ only in the Tesla overlay title; everything else is identical.

v1.0.3

• Added multi-language support (currently only EN).
• Users who require other languages can provide their own translations.
• See the README for how to add them.
• Please note that only Switch Lite is currently supported.
• The CN and EN versions are completely identical, except for the plugin title.

v1.0.2

• First Release.

Credits

• libnx - Switch development library
• libultrahand - Tesla Overlay framework
• minIni-nx - INI config parser library

External links

• Gbatemp - https://gbatemp.net/threads/keyx-supports-turbo-and-button-remapping.676903/
• Github - https://github.com/TOM-BadEN/KeyX