Compare Keychron K2 Ultra vs K4 Ultra Differences Side by Side

Explore the comprehensive side-by-side comparison of the Keychron K2 Ultra and Keychron K4 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
	91	75	Select a keyboard to compare
Rating	4.0 stars (4 reviews)	5.0 stars (2 reviews)
Purchase Options
Main differences	Has Tactile, Linear, Clicky switch options Available in a 75% layout Built with the ISO-ES, ISO-FR, ISO-IT, ISO, ANSI layout standard Supports QMK firmware Supports VIA configuration Uses a Gasket Mount mounting style Weighs about 1084 g Sized at 31 x 312 x 122 mm Made with a Aluminum, ABS case	Has Linear, Tactile, Clicky switch options Available in a 96% layout Built with the ANSI layout standard Uses a Plate Mount mounting style Weighs about 1241 g Sized at 31 x 391 x 140 mm Made with a ABS case
Score	Scores Performance: 90.1 Build Quality: 85.7 Productivity: 94.4 Customizability: 91.7 Portability: 82.1	Scores Performance: 88 Build Quality: 63.3 Productivity: 86.6 Customizability: 75.2 Portability: 57.1
Name	Name Keychron K2 Ultra	Name Keychron K4 Ultra
Release year	Release year 2026	Release year 2026
Switch Options	Switch Options Tactile, Linear, Clicky	Switch Options Linear, Tactile, Clicky
Profile	Profile Normal Profile	Profile Normal Profile
Hot Swappable	Hot Swappable	Hot Swappable
Layout Size	Layout Size 75%	Layout Size 96%
Layout Standard	Layout Standard ISO-ES, ISO-FR, ISO-IT, ISO, 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 8000 Hz	Polling Rate 8000 Hz
Battery capacity	Battery capacity 4000 mAh	Battery capacity 4000 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 Plate Mount
Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers
Sound Dampening	Sound Dampening	Sound Dampening
Backlight	Backlight Rgb, White, South-face, White South-face	Backlight Rgb, White, South-face, White South-face
Case Colors	Case Colors	Case Colors
Case Material	Case Material Aluminum, ABS	Case Material ABS
Keycaps Material	Keycaps Material PBT	Keycaps Material PBT
Dimensions	Dimensions 31 x 312 x 122 mm	Dimensions 31 x 391 x 140 mm
Weight	Weight 1084g	Weight 1241g