Compare Fiio KB3 vs MMD KM21 Ultra Differences Side by Side

Explore the comprehensive side-by-side comparison of the Fiio KB3 and MMD KM21 Ultra 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.

Model
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Rating	0.0 stars (0 reviews)	0.0 stars (0 reviews)
Purchase Options
Main differences	Released in 2023 Has Tactile, Linear switch options Uses a Gasket Mount mounting style Supports Wired, Wired only, Bluetooth, Wireless, connectivity Weighs about 1060 g Sized at 44 x 329 x 140 mm Made with a Plastic, Metal case	Released in 2026 Comes with a knob Supports QMK firmware Supports VIA configuration Has built-in sound dampening Uses a Top Mount mounting style Supports Bluetooth, 2.4 GHz, Wired, Wireless connectivity Equipped with a 980 mAh battery Made with a Aluminum case
Score	Scores Performance: 45 Build Quality: 51.8 Productivity: 59.7 Customizability: 76.4 Portability: 87.5	Scores Performance: 66.6 Build Quality: 81.7 Productivity: 89.5 Customizability: 89.8 Portability: 85.8
Name	Name Fiio KB3	Name MMD KM21 Ultra
Release year	Release year 2023	Release year 2026
Switch Options	Switch Options Tactile, Linear	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 Wired, Wired only, Bluetooth, Wireless,	Connection Bluetooth, 2.4 GHz, Wired, Wireless
Polling Rate	Polling Rate -	Polling Rate -
Battery capacity	Battery capacity -	Battery capacity 980 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 Gasket Mount	Mount Style Top Mount
Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers
Sound Dampening	Sound Dampening	Sound Dampening
Backlight	Backlight Rgb	Backlight Rgb
Case Colors	Case Colors	Case Colors
Case Material	Case Material Plastic, Metal	Case Material Aluminum
Keycaps Material	Keycaps Material -	Keycaps Material -
Dimensions	Dimensions 44 x 329 x 140 mm	Dimensions -
Weight	Weight 1060g	Weight -