Keychron K2 HE vs K3 UltraMagnetic vs Low-Profile 8K
Choose K2 HE for magnetic switch customization and longer battery, or K3 Ultra for a slim, lightweight build with higher polling rate.
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4.8 (49)4.8 · 49 reviews
from$129at Keychron
4.3 (9)4.3 · 9 reviews
from$109at MK
Which one should you get?
Get the
Keychron K2 HE
Magnetic
Build quality in the top 5% of 75% boards under $150.
- Magnetic Hall Effect switches with adjustable actuation from 0.2 to 3.8 mm
- QMK firmware and VIA support for extensive key remapping and macros
- 4000 mAh battery rated for up to 110 hours of wireless use
- Magnetic switches only. Standard MX switches will not fit.
- North-facing LEDs. Cherry-profile keycaps can hit the switch housing.
Get the
Keychron K3 Ultra
Low-Profile 8K
Build quality in the top 30% of 75% boards under $150.
- 8000 Hz polling rate in wired and 2.4 GHz modes
- Low-profile design with an 11.9 mm switch and 20.0 mm front edge
- Lightweight at 566 g for easy portability
- 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-DE, ISO-UK, ISO-Nordic. The other board is sold in those layouts.
If you want magnetic switches with adjustable actuation and a larger battery, the K2 HE is the more flexible choice for office and programming work. If portability and a higher polling rate matter more, the K3 Ultra's low-profile build and lighter weight make it easier to carry. Neither keyboard is universally better, so match the switch technology and form factor to your primary use.
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 K2 HE
Keychron K3 Ultra
Hall effect (magnetic)
Yes
No
Adjustable actuation helps in games and not in normal typing
Rapid trigger
Yes
No
Faster resets help in games and not in normal typing
Battery
4,000 mAh
2,600 mAh
A larger battery means fewer cables during the day
Low profile
No
Yes
Max polling rate
1,000 Hz
8,000 Hz
Higher polling helps competitive FPS and does nothing for typing
- Keychron K2 HE
- Keychron K3 Ultra
- Performance
- 9386
- Build quality
- 9175
- Productivity
- 9789
- Customizability
- 9886
- Portability
- 8182
- Layout size: 75%
- Connection: Bluetooth, 2.4 GHz, Wired
- Hot-swappable
- QMK
- VIA
- Sound dampening
What will you mostly use it for?
The K3 Ultra wins for gaming and travel due to its 8000 Hz polling rate and lightweight low-profile design. The K2 HE takes office, programming, modding, and content creation thanks to its magnetic switches, QMK firmware, and larger battery. Neither board is a clear all-rounder, so the choice hinges on whether switch customization or portability matters more.
Pick the Keychron K3 Ultra
- 8000 Hz polling rate in wired and 2.4 GHz modes, compared to 1000 Hz on the K2 HE
- Low-profile design may reduce finger travel, though magnetic switches are absent
- ZMK firmware supports remapping and macros via Keychron Launcher
What owners say
Ratings and quotes collected from verified store reviews, including the critical ones.
Keychron K2 HE
49 owner reviews
“Lowering the actuation depth improved my reaction time in competitive games. Analog mode in racing titles feels surprisingly natural. The mouse glide is smooth.”
Keychron K3 Ultra
9 owner reviews
“Portable, match my minimalist setup, great feeling, high quality, durable”
“Meh. I dont like the wood grain and they make it difficult to return or exchange”
Keychron K2 HE vs K3 Ultra specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
15 of 30 specs differ
Keychron K2 HE
Keychron K3 Ultra
Switch options
Hall effect (magnetic)
Rapid trigger
Hot-swappable
Mount style
Low profile
Sound dampening
Screw-in stabilizers
Layout size
Layout standard
Ergonomics
Knob
Display
Media keys
Connection
Max polling rate
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Dimensions
Typing angle
Backlight
QMK
VIA
N-key rollover
Mac & Windows
Released
ISO layouts by store
Which stores sell ISO-DE, UK, and the other regional layouts.
Keychron K2 HE
Keychron
ISO-DE, ISO-UK, ISO-Nordic, ISO-CH
In stockShips to you
Input Gear
ISO-DE
Out of stockShips to you
Keychron (DE)
ISO-DE, ISO-UK, ISO-FR, ISO-ES, ISO-CH
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.
Prices in USD are converted to your currency and can change at any time. KeebFinder may earn a commission when you buy through these links, at no extra cost to you.
Lowest price across stores, Amazon excluded.
Keychron K2 HE vs K3 Ultra: your questions
The K2 HE uses magnetic Hall Effect switches with adjustable actuation from 0.2 to 3.8 mm, while the K3 Ultra uses low-profile mechanical switches. The K3 Ultra also offers an 8000 Hz polling rate compared to 1000 Hz on the K2 HE.
The K3 Ultra has an 8000 Hz polling rate in wired and 2.4 GHz modes, which is higher than the K2 HE's 1000 Hz. However, the K2 HE's magnetic switches support Rapid Trigger and adjustable actuation, which some gamers prefer for custom response.
Yes, the K2 HE is hot-swappable and supports compatible magnetic switches such as Gateron Double-Rail Magnetic and Keychron Ultra-Fast Lime Magnetic switches. This allows you to change switches without soldering.
The K3 Ultra has a 2600 mAh battery rated for up to 550 hours of use with the backlight off. Actual battery life will vary based on usage and backlight settings.
Yes, the K2 HE weighs 980 g, while the K3 Ultra weighs 566 g. The K3 Ultra's lighter weight and low-profile design make it more portable.
The Keychron K2 HE supports QMK firmware and VIA, allowing for extensive key remapping and macros. The K3 Ultra uses ZMK firmware instead, also customizable via the Keychron Launcher web app.
Yes, the K2 HE is compatible with macOS, Windows, and Linux. It includes a system toggle and additional keycaps for both Mac and Windows layouts.
Yes, the K3 Ultra features an ultra-slim 11.9 mm low-profile switch and a 20.0 mm front edge height. This makes it one of the thinner wireless mechanical keyboards available.
The K2 HE has a 1000 Hz polling rate in wired and 2.4 GHz wireless modes. In Bluetooth mode, the polling rate is 125 Hz.
The K2 HE has a 4000 mAh battery, while the K3 Ultra has a 2600 mAh battery. The K2 HE is rated for up to 110 hours of wireless use, whereas the K3 Ultra is rated for up to 550 hours with the backlight off.
Some user reviews mention 2.4 GHz connectivity issues, such as lag or unresponsiveness. Others report the keyboard failing after about a year, though these are individual experiences.
The K3 Ultra uses Keychron Milk POM switches, available in linear Red, tactile Brown, or Banana variants. These low-profile switches are pre-lubed and hot-swappable.
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