Keychron K2 Ultra vs K3 Ultra
Choose the K2 Ultra for its larger battery and standard-profile layout, or the K3 Ultra if a lighter, low-profile build matters more.
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4.0 · 4 reviews
from$119at MK
2.8 · 6 reviews
from$109at MK
Which one should you get?
Get the
Keychron K2 Ultra
Battery
Build quality in the top 10% of 75% boards under $150.
- 4000mAh battery, with vendor-listed wireless use up to 760 hours.
- CNC aluminum and ABS construction with a steel plate.
- Hot-swappable switches, QMK support, and VIA support.
- South-facing LEDs. Shine-through legends stay dark, and some sculpted keycaps can clip the LED.
Get the
Keychron K3 Ultra
Build quality in the top 25% of 75% boards under $150.
- Lightweight 566g build with an aluminum-and-wood case.
- Low-profile design with LSA double-shot PBT keycaps.
- Hot-swappable switches, QMK support, and VIA support.
- 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, ISO-ES, ISO-IT. The other board is sold in those layouts.
Choose the K2 Ultra if you want a larger battery, standard-profile construction, or one of its listed French, Spanish, or Italian ISO layouts. Pick the K3 Ultra if reducing keyboard weight and using a low-profile design are higher priorities. Before buying the K3, check that your preferred switches, keycaps, and regional layout fit its compatibility limits.
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 Ultra
Keychron K3 Ultra
Battery
4,000 mAh
2,600 mAh
A larger battery means fewer cables during the day
Low profile
No
Yes
Case material
ABS, Aluminum
ABS, Wood
Mount style
Gasket Mount
Plate Mount
Layout standard
ANSI, ISO, ISO-ES, ISO-FR, ISO-IT
ANSI, ISO
ISO and JIS exist so regional layouts fit
- Keychron K2 Ultra
- Keychron K3 Ultra
- Performance
- 9086
- Build quality
- 8676
- Productivity
- 9489
- Customizability
- 9286
- Portability
- 8282
- Layout size: 75%
- Connection: Bluetooth, 2.4 GHz, Wired
- Hot-swappable
- Max polling rate: 8,000 Hz
- Switch options: Clicky, Linear, Tactile
- QMK
What will you mostly use it for?
The K2 Ultra has the edge for gaming, office work, programming, modding, and content creation based on its larger battery and additional listed features. The K3 Ultra is the clear travel-oriented option thanks to its lower weight and slim low-profile design. Both share wireless and wired connectivity, 8K polling, hot-swapping, and firmware customization support, so the choice largely comes down to standard versus low-profile form and portability.
Pick the Keychron K2 Ultra
- Both list 8000 Hz polling, but the K2 Ultra specifies N-key rollover and screw-in stabilizers.
- The K2's 4000mAh battery is larger than the K3's 2600mAh battery.
- The K3 also offers 8000 Hz polling, so polling rate alone does not separate them.
What owners say
Ratings and quotes collected from verified store reviews, including the critical ones.
Keychron K2 Ultra
4 owner reviews
“very compact, build quality is great, and I don't even feel any latency when using the keyboard wireless.”
“The only "zmk" support is from the launcher itself and its missing most of the ZMK features. For example Combos!”
Keychron K3 Ultra
6 owner reviews
“I bought this keyboard to test for work. I love how sturdy it feels, the wood aspects make it feel premium as well. I opted for the banana switches, they do not disturb my colleagues and it feels great for everyday tasks. The battery also seems to hold out…”
“Meh. I dont like the wood grain and they make it difficult to return or exchange”
Keychron K2 Ultra vs K3 Ultra specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
10 of 26 specs differ
Keychron K2 Ultra
Keychron K3 Ultra
Switch options
Hot-swappable
Mount style
Low profile
Sound dampening
Screw-in stabilizers
Layout size
Layout standard
Ergonomics
Display
Media keys
Connection
Max polling rate
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Dimensions
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 Ultra
Keychron (DE)
ISO-FR, ISO-ES, ISO-IT
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 K2 Ultra vs K3 Ultra: your questions
The K2 Ultra is a standard-profile 75% keyboard with a 4000mAh battery and steel plate. The K3 Ultra is low profile, weighs 566g, and uses a 2600mAh battery with an aluminum-alloy plate.
The K3 Ultra weighs 566g, while the K2 Ultra weighs 1084g. That makes the K3 the more portable choice based on listed weight.
Keychron lists up to 760 hours for the K2 Ultra and up to 550 hours for the K3 Ultra. These figures are given with the backlight off.
Both keyboards list 8000 Hz polling in wired and 2.4 GHz modes. Their vendor specifications list 125 Hz polling in Bluetooth mode.
Yes, both keyboards are listed as hot-swappable. The K2 uses Keychron Apex switches, while the K3 uses low-profile Keychron Milk POM switches.
No, the K3 Ultra requires low-profile switches and keycaps, and standard MX keycaps will not fit. Its north-facing LEDs can also interfere with Cherry-profile keycaps.
Both product metadata entries list QMK support and VIA support. Their vendor descriptions also identify ZMK firmware and the Keychron Launcher web app for key remapping and macros.
The K2 Ultra is listed in ANSI, ISO, ISO-FR, ISO-ES, and ISO-IT layouts. The K3 Ultra is listed in ANSI and ISO, and its compatibility notes specify that ISO-FR, ISO-ES, and ISO-IT are unavailable.
Both support Bluetooth and 2.4 GHz wireless, as well as a wired USB-C connection. Both also list Mac/Windows support.
The K3 Ultra has north-facing RGB LEDs, while the K2 Ultra has south-facing RGB LEDs. The K3's orientation may cause Cherry-profile keycaps to hit the switch housing, while the K2's south-facing LEDs can leave shine-through legends dark.
Both keyboards use a 75% layout, which the K2 vendor describes as space-saving. The K3 is also described as ultra-slim and weighs less, making it the more travel-friendly option between the two.
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