I’ve been using the same smartphone controller on my iPhone for years. That’s partly because most options are so similar. Announced at CES 2026, the X5 Alteron couldn’t be more different. It’s a collaboration between GameSir (which loves unusual peripheral ) and Hyperkin (retro-leaning ).
The X5 Alteron is apparently the world’s first fully modular mobile games controller. While the headline feature might be the stick/d-pad/button modules, the X5 Alteron has a very accommodating vice grip that works with devices from iPhone and Android phones through to the Switch series and even iPads. There’s even Bluetooth if you want to use it with a PC.
Mat Smith for Engadget
On the showfloor, Gamesir had a non-working prototype model with swappable modules, able to replicate most of your favorite layouts, including asymmetric analogue sticks, a yellow stick that’s aspiring to be a Gamecube controller and even a six-button array for those wanting to scratch that Sega Saturn itch. And if you want symmetrical sticks, you maniac, you can have that too. Rumble motors will also be built into the controller.
The modules lie flush when magnetically attached to the controller, although on the early prototype, they were difficult to remove. It’s pretty much fully customizable: there will be adjustable stick heights and hot-swappable buttons. Hyperkin and Gamesir are promising GameCube and N64 modules, and even a trackpad module for FPS games.
There’s contemporary technology too. The X5 Alteron will have capacitive sticks, not Hall-Effect ones. This should offer much more precision: the technology remains pretty rare in controllers. There are Hall-Effect analog triggers on the rear of the controller. It’s early days, with no release date or pricing set yet, but I’m intrigued — and I suspect many mobile gamers are too.