Keychron K3 V3 vs K4 ProUltra-Slim Low-Profile vs Full-Featured 96%

The Keychron K4 Pro has a significantly longer battery life. It is equipped with a 4000mAh battery, while the K3 V3 has a 1550mAh battery. The K4 Pro's larger capacity supports extended wireless usage periods.

You can use Cherry MX switches on the Keychron K4 Pro, as its hot-swap sockets support almost all 3-pin and 5-pin MX-style switches. The K3 V3, however, is only compatible with specific low-profile mechanical switches like Keychron Milk POM or Gateron/Keychron low-profile switches and cannot accept standard Cherry MX switches.

The main difference is the layout size. The K3 V3 uses a 75% layout, which omits the number pad and some navigation keys for a compact form. The K4 Pro uses a 96% layout, which squeezes a full number pad, function row, and navigation cluster into a space-saving design that is larger than 75% but smaller than a full-size keyboard.

The Keychron K4 Pro is generally better for programming. Its 96% layout provides dedicated arrow keys and a number pad, which are useful for coding and navigation, without the bulk of a full-size keyboard. Additionally, its south-facing RGB LEDs prevent interference with Cherry-profile keycaps, which are popular in the enthusiast community.

Yes, the Keychron K3 V3 is an excellent choice for travel. It is specifically designed to be ultra-slim and low-profile, weighing only 540 grams with a width of 306mm. This makes it much lighter and more compact than the 1280g K4 Pro, fitting easily into bags for mobile use.

Yes, both the Keychron K3 V3 and K4 Pro support open-source QMK firmware and VIA/Keychron Launcher for remapping keys and creating macros. This allows for deep customization of the typing experience and layer configurations on both models directly through a web app.

According to the product specifications, the Keychron K4 Pro's case is made from plastic and ABS. The listing also mentions it includes a steel plate inside the keyboard for structural support and typing feedback.

Based on the manufacturer's descriptions, the Keychron K4 Pro may have an advantage for quiet office use. Its product listing explicitly mentions added sound-absorbing foam and a thick silicone dampening bottom pad to create a peaceful typing sound. The K3 V3 also has foam but is not specifically marketed for sound dampening in the same way.

Yes, the Keychron K4 Pro is available in a Barebone kit version. This option comes without pre-installed switches and keycaps, allowing you to install your own preferred components from the start, which is ideal for custom builders.

Both keyboards offer adjustable typing angles. The Keychron K3 V3 provides three angles: 2.5°, 4.2°, and 6.5°. The Keychron K4 Pro also offers three adjustable angles, which are 3°, 7°, and 10°, according to its product description.

The Keychron K3 V3 uses LSA profile keycaps, which are a low-profile spherical angle design. The Keychron K4 Pro uses OSA profile keycaps, which are an OEM profile with a spherical angle. The K4 Pro's keycaps are also double-shot PBT for durability.

The Keychron K3 V3 features north-facing RGB LEDs. The Keychron K4 Pro features south-facing RGB LEDs. Keychron states the south-facing design on the K4 Pro better illuminates the keyboard from the typist's angle and avoids interference with Cherry-profile keycaps.