Keychron J4 QMK vs Neo One of Zero Si75 HEWireless vs High-Performance Gaming
Choose the Keychron J4 for wireless flexibility across devices, or the Neo Si75 HE for its wired, high-performance hall-effect gaming features.
Which one should you get?
Get the
Keychron J4 QMK
Wireless
- 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.
- 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.
Get the
Neo One of Zero Si75 HE
High-Performance Gaming
- 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.
- 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.
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.
The differences that matter
Skip the 40-row spec sheet. These are the specs that change how each board feels, sounds, and fits your desk.
Keychron J4 QMK
Neo One of Zero Si75 HE
Layout size
80%
75%
Hall effect (magnetic)
No
Yes
Rapid trigger
No
Yes
Connection
Bluetooth, 2.4 GHz, Wired
Wired
Max polling rate
1,000 Hz
8,000 Hz
- Keychron J4 QMK
- Neo One of Zero Si75 HE
- Performance
- 7995
- Build quality
- 6170
- Productivity
- 8491
- Customizability
- 7474
- Portability
- 7365
- Hot-swappable
- Sound dampening
- Keycaps: PBT
What will you mostly use it for?
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.
Pick the Neo 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.
Keychron J4 QMK vs Neo One of Zero Si75 HE specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
13 of 27 specs differ
Keychron J4 QMK
Neo One of Zero Si75 HE
Switch options
Hall effect (magnetic)
Rapid trigger
Hot-swappable
Mount style
Sound dampening
Screw-in stabilizers
Layout size
Layout standard
Ergonomics
Knob
Display
Connection
Max polling rate
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Dimensions
Typing angle
Backlight
QMK
N-key rollover
Mac & Windows
Released
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Keychron J4 QMK vs Neo One of Zero Si75 HE: your questions
The Keychron J4 QMK is definitively better for wireless use. It supports 2.4 GHz and Bluetooth 5.2 connections, includes a 3750mAh battery, and has a storage slot for its USB receiver. The Neo Si75 HE is a wired-only keyboard.
Yes, the Neo Si75 HE supports a knob. The product listing specifies knob support, and the included silicone modules are described as containing rotary knobs for customization.
You can use Cherry MX switches on the hot-swappable version of the Keychron J4, as it is compatible with 3-pin and 5-pin MX-style switches. The Neo Si75 HE has a hotswap magnetic PCB that is only compatible with magnetic switches with a specific pole orientation.
The hall-effect switches on the Si75 HE allow for adjustable actuation points from 0.2 to 3.8 mm, rapid trigger functionality, and dynamic keystrokes. These features provide a competitive edge in gaming by enabling faster, more precise inputs and customizing how each keypress is registered.
Both offer extensive software customization. The Keychron J4 uses the open-source QMK firmware and Keychron Launcher web app for deep programming. The Neo Si75 HE uses the One of Zero Web Launcher to remap keys, adjust actuation points, and create macros for its hall-effect switches.
Yes, both the Keychron J4 QMK and the Neo One of Zero Si75 HE list Mac compatibility as a feature. The Si75 HE listing also mentions a keyboard shortcut to switch between Windows and Mac layouts.
The Keychron J4 comes with double-shot PBT keycaps in either Cherry or MDA profile. The Neo Si75 HE includes 1.7mm thick, dye-sublimated PBT keycaps in a Cherry profile, plus 12 additional colorful keycaps.
Both keyboards feature sound dampening. The Keychron J4 uses multiple layers of foam including IXPE, PET, and EPDM. The Neo Si75 HE includes a porous foam layer between the PCB and plate and a PU foam layer with a rigid backing film under the PCB.
The Keychron J4 offers two adjustable typing angles, 4.5° and 9.6°. The Neo Si75 HE provides a 19mm front height with typing angles of 3.5° or 6.5°, adjustable via its included silicone feet.
The Neo Si75 HE can be good for typing, especially if you customize the actuation points of its 30g linear magnetic switches to suit your preference. However, its primary design and features, like rapid trigger, are geared towards gaming performance.
According to the listing, the Neo Si75 HE includes 12 colorful keycaps, two pairs of silicone adjustment feet, a USB-C cable, a USB-A to USB-C adapter, a keycap and switch puller, a screwdriver, and a hex key.
Yes, the Keychron J4 supports QMK firmware, which allows for remapping every key, creating complex macros, and programming layers. This is done through the Keychron Launcher web app when the keyboard is connected via wired mode.
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