Keychron C4 HE vs V6 UltraWired Hall Effect or Wireless 8K

The C4 HE is a wired-only Hall Effect keyboard built around Keychron Ultra-fast Lime Magnetic Switches, while the V6 Ultra uses standard mechanical Keychron Silk POM Switches and adds Bluetooth 5.3 and 2.4 GHz wireless. Both are full-size 100% boards with 8000 Hz polling and gasket mounting, so the choice hinges on magnetic switches versus wireless connectivity.

No, the C4 HE is listed as wired-only with a Type-C connection. Its 8000 Hz polling rate applies in wired mode, and you can switch between 1000, 4000, and 8000 Hz in the Keychron Launcher web app.

Yes, the V6 Ultra supports Bluetooth 5.3, 2.4 GHz, and wired connections. Polling is 8000 Hz in wired and 2.4 GHz modes, while Bluetooth runs at 125 Hz according to the vendor specifications.

Only the V6 Ultra has a battery, a 4000 mAh unit rated up to 660 hours with the backlight off, or up to 200 hours at the lowest RGB brightness. The C4 HE is wired-only and does not include a battery.

Yes, both are hot-swappable, but the C4 HE takes compatible Hall Effect magnetic switches while the V6 Ultra accepts 3-pin and 5-pin MX-style mechanical switches. The V6 Ultra listing names Cherry, Gateron, Kailh, and Panda as compatible switch brands.

The C4 HE has an edge for programming because it supports QMK and VIA for deep key remapping and layered layouts. The V6 Ultra relies on ZMK firmware and the Keychron Launcher web app, which also handles remapping and macros but through a different ecosystem.

The C4 HE uses a steel plate, which the vendor describes as giving responsive feedback and added stability. The V6 Ultra uses a polycarbonate plate paired with a gasket mount, which the vendor says reduces acoustic resonance for a softer, quieter feel.

The V6 Ultra is sold in a Fully Assembled Knob version and lists knob support among its features. The C4 HE has multi-media keys but no knob, so media control is handled through those keys and Launcher remapping.

The V6 Ultra weighs 1130 g, while the C4 HE weighs 970 g. The C4 HE's steel plate and added weight are described by the vendor as improving stability, though the V6 Ultra is still the heavier of the two overall.

The C4 HE ships with Cherry profile double-shot PBT keycaps, and the vendor says the sculpted shape reduces typing fatigue. The V6 Ultra uses OSA profile double-shot PBT keycaps, which Keychron describes as having a similar height to OEM with an SA-like shape.

Actuation adjustment is a Hall Effect feature tied to the C4 HE and its Keychron Ultra-fast Lime Magnetic Switches. The V6 Ultra uses standard mechanical Keychron Silk POM Switches, so adjustable actuation is not part of its listed feature set.

The V6 Ultra is the more practical travel option because Bluetooth 5.3 and 2.4 GHz wireless remove the need for a cable, and the 4000 mAh battery is rated up to 660 hours with backlight off. That said, both are full-size boards, and the V6 Ultra is the heavier of the two at 1130 g.