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Head to head · Prices checked Nov 12, 2026

Keychron C0 HE One Handed vs MMD KM40

Get the Keychron C0 HE One Handed for hall effect and rapid trigger.

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Quick verdict

Which one should you get?

Get the

Keychron C0 HE One Handed

Hall effect

Build quality in the bottom 35% of 40% boards under $150.

Rules this board out

  • Magnetic switches only. Standard MX switches will not fit.
  • North-facing LEDs. Cherry-profile keycaps can hit the switch housing.

Get the

MMD KM40

Build quality in the top 10% of 40% boards under $150.

What actually differs

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 C0 HE One Handed

MMD KM40

  • 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

  • Connection

    Wired

    Bluetooth, 2.4 GHz, Wired

    Wireless for several devices and wired for lower latency

  • Case material

    Plastic

    Aluminum

  • Switch options

    Magnetic

    Linear, Tactile

KeebFinder scores

How we score
  • Keychron C0 HE One Handed
  • MMD KM40
Performance
92
60
Build quality
54
82
Productivity
51
69
Customizability
60
83
Portability
67
84

What they share

  • Layout size: 40%
  • Hot-swappable
See every spec side by side

Full specs

Keychron C0 HE One Handed vs MMD KM40 specs

Every tracked spec, side by side. Rows marked with a dot differ between the boards.

14 of 23 specs differ

Keychron C0 HE One Handed

MMD KM40

Typing & switches

Switch options

Magnetic
Linear, Tactile

Hall effect (magnetic)

Yes
No

Rapid trigger

Yes
No

Hot-swappable

Yes
Yes

Mount style

Tray Mount
Gasket Mount

Sound dampening

No
Yes

Layout

Layout size

40%
40%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Display

None
None

Connectivity & battery

Connection

Wired
Bluetooth, 2.4 GHz, Wired

Max polling rate

8,000 Hz
—

Battery

Wired only
2,000 mAh

USB-C

No
Yes

Build & materials

Case material

Plastic
Aluminum

Plate material

Aluminum
Polycarbonate

Keycaps

ABS
PBT

Weight

—
620 g

Backlight

RGB, north-facing
RGB

Firmware & software

QMK

No
Yes

VIA

No
Yes

Mac & Windows

Yes
No

Extras

Released

2026
2026

Where to buy

Compare prices

Live prices from the stores we track, cheapest in-stock offer first.

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MMD KM402 stores

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