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Compare Keychron J4 QMK vs Neo One of Zero Si75 HE Differences Side by Side

This comparison is for buyers deciding between a versatile wireless TKL and a specialized wired gaming board. The Keychron J4 QMK offers tri-mode connectivity and QMK programmability, while the Neo Si75 HE focuses on ultra-low latency, hall-effect switches, and advanced gaming functions. The decision hinges on whether you prioritize wireless convenience and open-source firmware or the absolute latest in wired gaming performance and customization.

72
Keychron J4 QMK Wireless Mechanical Keyboard (US ANSI Layout)
80
ONEofZERO Si75 HE Hotswap RGB Keyboard

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0.0 (0)
0.0 (0)
  • Released in 2025
  • Has Tactile, Linear switch options
  • Available in a 80% layout
  • Supports QMK firmware
  • Features N-key rollover
  • Supports Bluetooth, 2.4 GHz, Wired, Wireless connectivity
  • Runs at a 1000 Hz polling rate
  • Equipped with a 4000 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 2026
  • Has Magnetic switch options
  • Available in a 75% layout
  • Comes with a knob
  • Utilizes Hall effect sensors
  • Enables rapid trigger functionality
  • Includes screw-in stabilizers
  • Uses a Gasket Mount mounting style
  • Supports Wired, Wired only connectivity
  • Runs at a 8000 Hz polling rate
  • Made with a ABS, Polycarbonate case
  • Offers Yes, Rgb, South-face, Rgb South-face RGB lighting
Scores
  • Performance: 79.4
  • Build Quality: 61.2
  • Productivity: 84.4
  • Customizability: 74.6
  • Portability: 73.5
Scores
  • Performance: 95.3
  • Build Quality: 69.7
  • Productivity: 90.8
  • Customizability: 74.7
  • Portability: 65.1
Name
Keychron J4 QMK
Name
Neo One of Zero Si75 HE
Release year
2025
Release year
2026
Switch Options
Tactile, Linear
Switch Options
Magnetic
Profile
Normal Profile
Profile
Normal Profile
Hot Swappable
 
Hot Swappable
 
Layout Size
80%
Layout Size
75%
Layout Standard
ANSI
Layout Standard
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
Wired, Wired only
Polling Rate
1000 Hz
Polling Rate
8000 Hz
Battery capacity
4000 mAh
Battery capacity
-
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
Gasket Mount
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
Rgb, White, North-face
Backlight
 
Rgb, South-face
Case Colors
Case Colors
Case Material
ABS
Case Material
ABS, Polycarbonate
Keycaps Material
PBT
Keycaps Material
PBT
Dimensions
38 x 366 x 138 mm
Dimensions
-
Weight
870g
Weight
-
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Pros and Trade-offs

Your primary need dictates the choice. If you require a single keyboard to work wirelessly across multiple devices in an office or home setting, the Keychron J4 QMK is the more versatile tool. If you are a dedicated PC gamer seeking the lowest possible latency and want to experiment with hall-effect switch customization, the Neo One of Zero Si75 HE offers specialized performance. Consider the wired tether and higher price of the Si75 HE a worthwhile trade-off for its gaming-centric features.

Keychron J4 QMK

  • +Tri-mode connectivity with 2.4 GHz, Bluetooth 5.2, and wired USB-C.
  • +Open-source QMK firmware support for deep key remapping and macros.
  • +Includes multiple layers of acoustic foam (IXPE, PET, EPDM) for sound dampening.
  • +3750mAh battery for extended wireless use.
  • +Offers a hot-swappable version compatible with 3-pin and 5-pin MX-style switches.
  • −Lower 1000 Hz polling rate compared to the Si75 HE's 8000 Hz.
  • −Uses traditional mechanical switches, lacking hall-effect features like adjustable actuation.
  • −ABS case material, while the Si75 HE uses a polycarbonate case.

Neo One of Zero Si75 HE

  • +8000 Hz polling rate and 32K scan rate for ultra-low latency.
  • +Hall-effect magnetic switches with adjustable actuation points (0.2-3.8mm) and rapid trigger.
  • +Gasket mount design with colorful, interchangeable silicone modules for customization.
  • +Includes advanced gaming features like dynamic keystrokes and analog mode.
  • +Comes with screw-in PCB mount stabilizers and 1.7mm thick PBT keycaps.
  • −Wired-only connectivity, lacking Bluetooth or 2.4 GHz wireless options.
  • −Compatible only with specific magnetic switches, limiting hot-swap options compared to standard MX styles.
  • −No integrated battery, requiring a constant wired connection.

Which Keyboard Is Better for Your Needs?

The Neo Si75 HE is the clear choice for competitive gaming due to its high polling rate and hall-effect features. For office, travel, and content creation, the Keychron J4's wireless connectivity provides greater flexibility. Programming is a tie, with both offering robust software customization, while modders may prefer the Si75 HE's unique gasket mount and modular design.

GamingNeo One of Zero Si75 HE
  • •The Neo Si75 HE has an 8000 Hz polling rate, significantly higher than the J4's 1000 Hz.
  • •It features hall-effect magnetic switches with adjustable actuation points and rapid trigger functionality.
  • •It includes dynamic keystrokes and analog mode for game controller-like input.
OfficeKeychron J4 QMK
  • •The Keychron J4 supports Bluetooth 5.2 for connecting to three devices, ideal for multitasking.
  • •Its 3750mAh battery and wireless modes offer cable-free desk setup.
  • •It includes Mac/Win support and a TKL layout that saves space while retaining navigation keys.
ProgrammingTie
  • •Both keyboards are hot-swappable and support extensive key remapping.
  • •The J4 offers QMK firmware for deep, open-source customization.
  • •The Si75 HE uses a web launcher for programming macros and shortcuts.
TravelKeychron J4 QMK
  • •The Keychron J4 is wireless, eliminating the need to carry a cable for use.
  • •It has a built-in 2.4 GHz receiver storage slot.
  • •Its 80% TKL layout is more compact than a full-size board.
ModdingNeo One of Zero Si75 HE
  • •The Neo Si75 HE has a gasket mount design and includes interchangeable silicone modules for customization.
  • •It comes with screw-in PCB mount stabilizers.
  • •The listing mentions multiple sound dampening layers, including porous foam and PU foam.
Content CreationKeychron J4 QMK
  • •The Keychron J4's wireless connectivity allows for a cleaner setup for filming or streaming.
  • •Per-key RGB and mix RGB zones offer extensive lighting control for visual setups.
  • •The TKL layout provides dedicated arrow and navigation keys for timeline scrubbing.

Frequently Asked Questions (FAQ)

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