Keychron K3 Max vs K4 V2Low-Profile Wireless vs Full 96%

The K3 Max is a 75% low-profile wireless keyboard with 2.4 GHz, Bluetooth, and wired connectivity plus QMK/VIA support. The K4 V2 is a 96% layout with 100 keys including a number pad, using Bluetooth and wired only. The choice comes down to slim portability and firmware depth versus a full key set and larger battery.

The K3 Max is the stronger gaming pick because it offers a 2.4 GHz connection with a 1000 Hz polling rate and N-key rollover in both wireless and wired modes. The K4 V2 relies on Bluetooth or wired, and its Bluetooth polling rate is listed at 90 Hz. For lower-latency wireless play, the K3 Max has the edge.

Yes, the K4 V2 uses a 96% layout with 100 keys that includes a number pad. Keychron notes the Del key is relocated for easier access, and Num Lock works with Windows OS only. This makes it better suited to spreadsheet and data entry work than the 75% K3 Max.

Hot-swapping is available on the RGB backlight version of the K3 Max. It accepts Gateron and Keychron low-profile mechanical switches, and Keychron states QMK does not support low-profile optical switches. The white backlight version is not listed as hot-swappable.

The K4 V2 has a 4000 mAh battery rated up to 240 hours with the backlight off, or up to 72 hours with RGB on. The K3 Max has a 1550 mAh battery rated up to 73 hours. The K4 V2 lasts considerably longer per charge in backlight-off use.

The K3 Max supports QMK firmware and the Keychron Launcher web app for key remapping, macros, and shortcuts. Keychron lists VIA support in the product metadata, and the Launcher runs in Chrome, Edge, or Opera with the keyboard connected in wired mode. It works with macOS, Windows, and Linux.

Yes, the K4 V2 includes keycaps for both macOS and Windows and is listed as compatible with both systems. It connects over Bluetooth 5.1 to up to 3 devices or through USB-C wired mode. The K3 Max similarly includes macOS and Windows keycaps and adds Linux support through the Launcher.

The K3 Max is more portable at a listed 525 g and a 75% 84-key size, with low-profile switches Keychron says are 31% slimmer than standard. The K4 V2 weighs about 770 g in plastic or 933 g in aluminum and uses a larger 96% footprint. For carrying between locations, the K3 Max is the lighter option.

The K3 Max uses low-profile double-shot PBT keycaps with LSA profile, which Keychron describes as oil-resistant for long-term use. The K4 V2 uses ABS keycaps. PBT generally resists shine better over time, which favors the K3 Max for long-term durability.

Only the K3 Max includes a 2.4 GHz connection alongside Bluetooth and wired, with a 1000 Hz polling rate on 2.4 GHz and wired modes. The K4 V2 offers Bluetooth 5.1 and USB-C wired only. If low-latency wireless matters, the K3 Max is the one to choose.

The Keychron K4 V2 product page shows a sold out status and lists zero vendors in stock for the tracked pricing range. The K3 Max is listed across multiple vendors in stock. Check availability before committing, since the K4 V2 may require waiting for a restock.

The K3 Max includes IXPE acoustic foam and latex foam inside the case, which Keychron says supports a quieter typing experience. The K4 V2 listing does not describe internal acoustic foam for this version, and Keychron points to the K4 Version 3 as the model with enhanced acoustic foams. Switch choice on either board also affects noise.