Keychron K3 vs K3 Ultra
Choose the K3 Ultra if you need ultra-low latency for gaming or deep customizability via ZMK firmware; the standard K3 is a more affordable, proven option for everyday typing.
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No reviews
from$105at Keychron (DE)
4.3 (9)4.3 · 9 reviews
from$109at MK
Which one should you get?
Get the
Keychron K3
Build quality in the bottom 40% of 75% boards under $150.
- Lower price, making it a more budget-friendly entry into low-profile mechanical keyboards
- Lightweight construction with aluminum and ABS materials for easy portability
- Comes with 17 extra keycaps and a dust cover in the box for added value
- Low-profile switches and keycaps only. Standard MX keycaps will not fit.
- North-facing LEDs. Cherry-profile keycaps can hit the switch housing.
Get the
Keychron K3 Ultra
Battery
Build quality in the top 30% of 75% boards under $150.
- 8000 Hz polling rate in 2.4 GHz and wired modes for competitive gaming responsiveness
- ZMK firmware with Launcher web app for full key remapping and macro customization
- Interior acoustic foam (IXPE and EPDM) for dampened, quieter keystrokes
- Low-profile switches and keycaps only. Standard MX keycaps will not fit.
- North-facing LEDs. Cherry-profile keycaps can hit the switch housing.
- Missing ISO-FR. The other board is sold in those layouts.
If your primary concern is competitive gaming latency or you want deep firmware-level customization, the K3 Ultra is the clear choice with its 8K polling rate, 2.4 GHz, and ZMK support. For everyday typing, frequent travel, or a lower upfront investment, the standard K3 remains a capable and proven low-profile wireless keyboard. The decision ultimately hinges on whether you need the Ultra's performance extras or prefer the K3's simplicity and value.
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 K3
Keychron K3 Ultra
Connection
Bluetooth, Wired
Bluetooth, 2.4 GHz, Wired
Wireless for several devices and wired for lower latency
Battery
1,550 mAh
2,600 mAh
A larger battery means fewer cables during the day
Case material
ABS, Aluminum
ABS, Wood
QMK
No
Yes
The deep option when you want to remap every key
VIA
No
Yes
GUI remapping without compiling firmware
- Keychron K3
- Keychron K3 Ultra
- Performance
- 6486
- Build quality
- 6175
- Productivity
- 6689
- Customizability
- 6886
- Portability
- 8082
- Layout size: 75%
- Hot-swappable
- Low profile
- Switch options: Clicky, Linear, Tactile
- Mount style: Plate Mount
What will you mostly use it for?
The K3 Ultra wins in gaming, programming, modding, and content creation thanks to its 8K polling rate, 2.4 GHz connectivity, ZMK firmware, and robust foam layering. The standard K3 takes the lead for travel due to its lighter build and lower cost. For general office use, both keyboards perform equally well, offering Bluetooth, a compact 75% layout, and low-profile design. The K3 Ultra's larger battery and customizable firmware give it a clear edge for power users who value performance and flexibility.
Pick the Keychron K3 Ultra
- 8000 Hz polling rate in 2.4 GHz and wired modes for ultra-low latency
- 2.4 GHz wireless connectivity for a stable, interference-free connection
- Powerful ARM core with dedicated MCU for faster processing
Keychron K3 vs K3 Ultra specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
11 of 23 specs differ
Keychron K3
Keychron K3 Ultra
Switch options
Hot-swappable
Mount style
Low profile
Sound dampening
Layout size
Layout standard
Ergonomics
Display
Media keys
Connection
Max polling rate
Battery
USB-C
Case material
Plate material
Keycaps
Typing angle
Backlight
QMK
VIA
Mac & Windows
Released
ISO layouts by store
Which stores sell ISO-DE, UK, and the other regional layouts.
Keychron K3
Keychron (DE)
ISO-FR
In stockDoes not ship to you
Keychron K3 Ultra
Keychron
ISO
In stockShips to you
Keychron (DE)
ISO
In stockDoes not ship to you
Compare prices
Live prices from the stores we track, cheapest in-stock offer first.
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Lowest price across stores, Amazon excluded.
Keychron K3 vs K3 Ultra: your questions
The K3 Ultra uses ZMK firmware rather than QMK or VIA. It can be customized using the Keychron Launcher web app, which supports key remapping, macros, and lighting controls. The standard K3 does not mention QMK, VIA, or ZMK support in its listing.
The standard K3 has a 1550 mAh battery that offers up to 34 hours of use with backlight at the lowest brightness. The K3 Ultra features a larger 2600 mAh battery and claims up to 550 hours of battery life with the backlight off, thanks to its ARM core and ZMK firmware.
Yes, both the Keychron K3 and K3 Ultra support hot-swappable switches. The K3 uses low-profile Keychron Optical switches, while the K3 Ultra uses Keychron Milk POM switches. They are not cross-compatible as the K3's Optical switches are not compatible with conventional MX mechanical switches.
The K3 Ultra supports an 8000 Hz polling rate in both 2.4 GHz and wired modes, making it far superior for competitive gaming. The standard K3 does not advertise a specific polling rate, and its lower performance score reflects this limitation.
The vendor description for the K3 Ultra lists compatibility with macOS, Windows, and Linux only. There is no mention of console compatibility, so it is not recommended for use with PlayStation or Xbox without additional adapters.
The standard Keychron K3 uses either PBT or ABS keycaps depending on the variant. The K3 Ultra uses double-shot PBT keycaps with an LSA (low-profile spherical-angled) profile, which are oil-resistant and durable according to the vendor.
The K3 Ultra vendor page states it can connect up to 3 devices via Bluetooth. The standard K3 vendor page mentions connecting to smartphones, laptops, and tablets but does not specify a maximum number of paired devices. For definitive details, check the manufacturer's guide.
Yes, the K3 Ultra is sold in Fully Assembled ISO variants, including ISO-German, ISO-UK, and ISO-Nordic options, in addition to ANSI. The standard K3 is also available in ISO-FR, ISO, and ANSI layouts.
The K3 Ultra includes multiple sound-dampening layers: IXPE acoustic foam, EPDM foam for switch support, bottom case acoustic foam, and PET film. The standard K3 does not mention any interior acoustic foam in its specifications.
The Keychron K3 vendor page notes that for Linux users, a dedicated user group is available to help with the experience, but does not explicitly guarantee out-of-box compatibility. The K3 Ultra vendor page lists Linux as a compatible system, so it may offer better plug-and-play support.
The K3 Ultra supports per-key RGB and mix RGB lighting, allowing individual key color customization via the Launcher web app. The standard K3 features 18 types of RGB backlight settings but does not specify per-key control in its vendor descriptions.
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