Compare Feker JJK21 vs Keychron Lemokey X4 Differences Side by Side

Explore the comprehensive side-by-side comparison of the Feker JJK21 and Keychron Lemokey X4 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
	77	85	Select a keyboard to compare
Rating	2.8 stars (10 reviews)	0.0 stars (0 reviews)
Purchase Options
Main differences	Released in 2022 Available in a Numpad layout Supports Bluetooth, 2.4 GHz, Wired, Wireless connectivity Equipped with a 1500 mAh battery Weighs about 300 g Made with a Plastic case Offers Yes, Rgb RGB lighting	Released in 2024 Has Linear, Tactile, Clicky switch options Available in a 75% layout Compatible with both Mac and Windows Supports QMK firmware Includes screw-in stabilizers Supports Wired, Wired only connectivity Runs at a 1000 Hz polling rate Weighs about 712 g Sized at 41 x 325 x 145 mm Made with a ABS, Plastic case Features ABS, PBT keycaps Offers Yes, South-face, North-face RGB lighting
Score	Scores Performance: 77 Build Quality: 75.1 Productivity: 74.2 Customizability: 80.6 Portability: 86.3	Scores Performance: 74.6 Build Quality: 81.6 Productivity: 95.2 Customizability: 82.7 Portability: 64.9
Name	Name Feker JJK21	Name Keychron Lemokey X4
Release year	Release year 2022	Release year 2024
Switch Options	Switch Options -	Switch Options Linear, Tactile, Clicky
Profile	Profile Normal Profile	Profile Normal Profile
Hot Swappable	Hot Swappable	Hot Swappable
Layout Size	Layout Size Numpad	Layout Size 75%
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 Wired, Wired only
Polling Rate	Polling Rate -	Polling Rate 1000 Hz
Battery capacity	Battery capacity 1500 mAh	Battery capacity -
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 Gasket Mount
Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers
Sound Dampening	Sound Dampening	Sound Dampening
Backlight	Backlight Rgb	Backlight South-face, North-face
Case Colors	Case Colors	Case Colors
Case Material	Case Material Plastic	Case Material ABS, Plastic
Keycaps Material	Keycaps Material -	Keycaps Material ABS, PBT
Dimensions	Dimensions -	Dimensions 41 x 325 x 145 mm
Weight	Weight 300g	Weight 712g