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Compare Keychron J4 QMK vs K2 Max Differences Side by Side

Explore the comprehensive side-by-side comparison of the Keychron J4 QMK and Keychron K2 Max 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.

72
Keychron J4 QMK Wireless Mechanical Keyboard (US ANSI Layout)
92
Keychron K2 Max QMK Wireless Mechanical Keyboard ISO Layout Collection

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  • Released in 2025
  • Has Tactile, Linear switch options
  • Available in a 80% layout
  • Built with the ANSI layout standard
  • Equipped with a 3750 mAh battery
  • Weighs about 870 g
  • Sized at 38 x 366 x 138 mm
  • Made with a ABS case
  • Offers Yes, Rgb, White, North-face, Rgb North-face, White North-face RGB lighting
  • Released in 2024
  • Has Linear, Tactile, Clicky switch options
  • Available in a 75% layout
  • Built with the ISO, ANSI, ISO-DE, ISO-UK, ISO-Nordic, ISO-SW layout standard
  • Provides dedicated media keys
  • Supports VIA configuration
  • Includes screw-in stabilizers
  • Uses a PCB Mount mounting style
  • Equipped with a 4000 mAh battery
  • Weighs about 940 g
  • Sized at 32 x 317 x 122 mm
  • Made with a Aluminum, ABS case
  • Offers Yes, Rgb, South-face, Rgb South-face, White, White South-face RGB lighting
Scores
  • Performance: 79.2
  • Build Quality: 60.9
  • Productivity: 84.4
  • Customizability: 74.3
  • Portability: 73.8
Scores
  • Performance: 81
  • Build Quality: 85.7
  • Productivity: 94.4
  • Customizability: 92.4
  • Portability: 79.6
Name
Keychron J4 QMK
Name
Keychron K2 Max
Release year
2025
Release year
2024
Switch Options
Tactile, Linear
Switch Options
Linear, Tactile, Clicky
Profile
Normal Profile
Profile
Normal Profile
Hot Swappable
 
Hot Swappable
 
Layout Size
80%
Layout Size
75%
Layout Standard
ANSI
Layout Standard
ISO, ANSI, ISO-DE, ISO-UK, ISO-Nordic, ISO-SW
Layout Ergonomics
Normal
Layout Ergonomics
Normal
Knob Support
 
Knob Support
 
Display Support
 
Display Support
 
Mac/Win Support
 
Mac/Win Support
 
Multi-Media Keys
 
Multi-Media Keys
 
USB-C
 
USB-C
 
USB passthrough
 
USB passthrough
 
Connection
Bluetooth, 2.4 GHz, Wired, Wireless
Connection
Bluetooth, 2.4 GHz, Wired, Wireless
Polling Rate
1000 Hz
Polling Rate
1000 Hz
Battery capacity
3750 mAh
Battery capacity
4000 mAh
Hall Effect Support
 
Hall Effect Support
 
QMK Support
 
QMK Support
 
VIA Support
 
VIA Support
 
VIAL Support
 
VIAL Support
 
N-Key Rollover
 
N-Key Rollover
 
Rapid Trigger
 
Rapid Trigger
 
Mount Style
-
Mount Style
PCB Mount
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
Rgb, White, North-face
Backlight
 
Rgb, South-face, White, White South-face
Case Colors
Case Colors
Case Material
ABS
Case Material
Aluminum, ABS
Keycaps Material
PBT
Keycaps Material
PBT
Dimensions
38 x 366 x 138 mm
Dimensions
32 x 317 x 122 mm
Weight
870g
Weight
940g
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