Compare MMD KM21 Ultra vs MelGeek O2 Differences Side by Side

Explore the comprehensive side-by-side comparison of the MMD KM21 Ultra and MelGeek O2 and view their biggest differences. The detailed comparison table allows you to see all the essential features, specifications, and benefits of each keyboard at a glance. Whether you're looking for performance, value, or specific functionalities, this comparison tool helps you make an informed decision.

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Main differences	Released in 2026 Supports hot-swappable switches Comes with a knob Connects via USB-C Supports QMK firmware Supports VIA configuration Uses a Top Mount mounting style Equipped with a 980 mAh battery Made with a Aluminum case Offers Yes, Rgb RGB lighting	Released in 2025 Uses a Gasket Mount mounting style Runs at a 1000 Hz polling rate Equipped with a 2500 mAh battery Weighs about 650 g Sized at 135 x 326 x 27 mm Made with a Aluminum, Polycarbonate, ABS case Features PBT keycaps Offers Yes, Rgb, North-face, Rgb North-face RGB lighting
Score	Scores Performance: 66.7 Build Quality: 81.6 Productivity: 89.2 Customizability: 89.7 Portability: 85.9	Scores Performance: 54.6 Build Quality: 65.8 Productivity: 53.8 Customizability: 50.8 Portability: 82.6
Name	Name MMD KM21 Ultra	Name MelGeek O2
Release year	Release year 2026	Release year 2025
Switch Options	Switch Options -	Switch Options -
Profile	Profile Normal Profile	Profile Normal Profile
Hot Swappable	Hot Swappable	Hot Swappable
Layout Size	Layout Size Numpad	Layout Size Numpad
Layout Standard	Layout Standard ANSI	Layout Standard ANSI
Layout Ergonomics	Layout Ergonomics Normal	Layout Ergonomics Normal
Knob Support	Knob Support	Knob Support
Display Support	Display Support	Display Support
Mac/Win Support	Mac/Win Support	Mac/Win Support
Multi-Media Keys	Multi-Media Keys	Multi-Media Keys
USB-C	USB-C	USB-C
USB passthrough	USB passthrough	USB passthrough
Connection	Connection Bluetooth, 2.4 GHz, Wired, Wireless	Connection Bluetooth, 2.4 GHz, Wired, Wireless
Polling Rate	Polling Rate -	Polling Rate 1000 Hz
Battery capacity	Battery capacity 980 mAh	Battery capacity 2500 mAh
Hall Effect Support	Hall Effect Support	Hall Effect Support
QMK Support	QMK Support	QMK Support
VIA Support	VIA Support	VIA Support
VIAL Support	VIAL Support	VIAL Support
N-Key Rollover	N-Key Rollover	N-Key Rollover
Rapid Trigger	Rapid Trigger	Rapid Trigger
Mount Style	Mount Style Top Mount	Mount Style Gasket Mount
Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers
Sound Dampening	Sound Dampening	Sound Dampening
Backlight	Backlight Rgb	Backlight Rgb, North-face
Case Colors	Case Colors	Case Colors
Case Material	Case Material Aluminum	Case Material Aluminum, Polycarbonate, ABS
Keycaps Material	Keycaps Material -	Keycaps Material PBT
Dimensions	Dimensions -	Dimensions 135 x 326 x 27 mm
Weight	Weight -	Weight 650g