Which Xkey Is Right for You?

A Simple Guide to the Xkey 25, Xkey 37, and Xkey Air

If you’re exploring the world of ultra-portable MIDI controllers, you’ve probably come across the Xkey series. And for good reason: Xkey instruments combine full-sized expressive keys, a beautifully slim aluminum design, and true mobility in a way that few keyboards can match.

But with different versions — 25 keys, 37 keys, USB micro-B, USB-C, Bluetooth — it can be hard to know which one is right for your setup. This guide gives you a clear, friendly overview of the entire Xkey family so you can pick your perfect creative companion.

Two Sizes, One Playing Experience

No matter which model you choose, you’re always getting the same 5 point foundation:

• Full-size, velocity-sensitive keys

• Polyphonic aftertouch

• Smart touch controls for pitch, modulation, octave, sustain

• Ultra-thin aluminum frame

• Xkey Plus app for custom configuration

Every Xkey feels the same under your fingers. Your only real choice is: How many keys do you want? And how do you want to connect?

Xkey 25 — The Ultra-Portable Choice

The Xkey 25 is the go-anywhere version. It’s the keyboard people throw in their backpack, keep on their desk, or use for sketching ideas on an airplane or in a café.

Despite its size, it still delivers the expressive playability of a full keyboard — including polyphonic aftertouch, which you rarely find in controllers this small.

USB Models: Micro-B vs USB-C

There are two wired versions:

Xkey 25 USB (Micro-B)

The original model with a micro-B connector. Fully functional, just based on the older USB standard.

Xkey 25 USB-C (New)

The modern version with a USB-C port for improved compatibility and long-term reliability.

If you’re buying today, the USB-C model is the recommended choice. If you consider your budget, get yourself the micro-USB version at the best possible price while supplies last.

Xkey 37 — More Range, Same Slim Design

If you want a little more musical freedom — chords, melodies, two-hand playing — the Xkey 37 is the sweet spot.

It adds a full extra octave while remaining incredibly thin and lightweight. This is the keyboard for producers, composers, and performers who want something portable but not limiting.

USB Models: Micro-B vs USB-C

Just like the 25-key version, you can choose from two wired models:

Xkey 37 USB (Micro-B)

The classic wired version using the original connector.

Xkey 37 USB-C (New)

The latest evolution, featuring:

• A modern USB-C port

• The Xcable adapter, which adds:

• 5-pin DIN MIDI Out

• ¼” Sustain pedal input

• ¼” Expression pedal input

If you perform live or integrate hardware synths, the USB-C model + Xcable is a huge upgrade. If you are interested in the lowest possible price, research the micro-B solution and get a great deal while supplies last.

Xkey Air — Go Wireless, Stay Expressive

For musicians who want total freedom from cables, there’s the Xkey Air series.

Available in 25-key and 37-key versions, Xkey Air uses Bluetooth MIDI with ultra-low latency, so your playing remains tight and responsive.

It’s perfect for iPad setups, stage performers, couch producers, and anyone who loves a clean, cable-free workflow. And when you need it, there’s still a USB port for wired use and charging.