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Compare Keychron J4 QMK vs K3 Max Differences Side by Side

Explore the comprehensive side-by-side comparison of the Keychron J4 QMK and Keychron K3 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)
94
Keychron K3 Max QMK/VIA Wireless Custom Mechanical Keyboard ISO Layout Collection

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0.0 (0)
4.7 (8)
  • 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
  • Features PBT keycaps
  • Released in 2023
  • Has Tactile, Linear, Clicky switch options
  • Features a low-profile design
  • Available in a 75% layout
  • Built with the ISO, ISO-UK, ISO-DE, ISO-Nordic, ISO-SW, ANSI layout standard
  • Provides dedicated media keys
  • Supports VIA configuration
  • Includes screw-in stabilizers
  • Uses a Plate Mount mounting style
  • Equipped with a 1550 mAh battery
  • Weighs about 580 g
  • Sized at 22 x 306 x 116 mm
  • Made with a ABS, Aluminum, Wood, Plastic case
  • Features PBT, ABS keycaps
Scores
  • Performance: 79.2
  • Build Quality: 60.9
  • Productivity: 84.4
  • Customizability: 74.3
  • Portability: 73.8
Scores
  • Performance: 80.8
  • Build Quality: 86.4
  • Productivity: 94.2
  • Customizability: 92.3
  • Portability: 77.3
Name
Keychron J4 QMK
Name
Keychron K3 Max
Release year
2025
Release year
2023
Switch Options
Tactile, Linear
Switch Options
Tactile, Linear, Clicky
Profile
Normal Profile
Profile
Low Profile
Hot Swappable
 
Hot Swappable
 
Layout Size
80%
Layout Size
75%
Layout Standard
ANSI
Layout Standard
ISO, ISO-UK, ISO-DE, ISO-Nordic, ISO-SW, ANSI
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
1550 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
Plate Mount
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
Rgb, White, North-face
Backlight
 
Rgb, White, North-face
Case Colors
Case Colors
Case Material
ABS
Case Material
ABS, Aluminum, Wood, Plastic
Keycaps Material
PBT
Keycaps Material
PBT, ABS
Dimensions
38 x 366 x 138 mm
Dimensions
22 x 306 x 116 mm
Weight
870g
Weight
580g
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