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Head to head · Prices checked Oct 28, 2026

Cidoo V87 vs MMD KM40

Get the Cidoo V87 for knob. Get the MMD KM40 for qmk.

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Quick verdict

Which one should you get?

Get the

Cidoo V87

Knob

Build quality in the top 25% of 80% boards under $150.

Rules this board out

  • South-facing LEDs. Shine-through legends stay dark, and some sculpted keycaps can clip the LED.
  • No numpad.
$149 at Mechkeys

Get the

MMD KM40

QMK

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

Rules this board out

  • Compact layout only. No function row, dedicated arrow keys, or numpad.
$84 at MonacoKeys

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.

Cidoo V87

MMD KM40

  • Layout size

    80%

    40%

  • Switch options

    Linear

    Linear, Tactile

  • Knob

    Yes

    No

  • QMK

    No

    Yes

    The deep option when you want to remap every key

  • Backlight

    RGB, south-facing

    RGB

    RGB for looks and low light rather than speed

KeebFinder scores

How we score
  • Cidoo V87
  • MMD KM40
Performance
54
61
Build quality
68
83
Productivity
75
69
Customizability
74
84
Portability
70
84

What they share

  • Connection: Bluetooth, 2.4 GHz, Wired
  • Hot-swappable
  • Case material: Aluminum
  • Mount style: Gasket Mount
  • VIA
  • Sound dampening
See every spec side by side

Full specs

Cidoo V87 vs MMD KM40 specs

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

6 of 20 specs differ

Cidoo V87

MMD KM40

Typing & switches

Switch options

Linear
Linear, Tactile

Hot-swappable

Yes
Yes

Mount style

Gasket Mount
Gasket Mount

Sound dampening

Yes
Yes

Layout

Layout size

80%
40%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

Yes
No

Display

None
None

Connectivity & battery

Connection

Bluetooth, 2.4 GHz, Wired
Bluetooth, 2.4 GHz, Wired

Battery

—
2,000 mAh

USB-C

Yes
Yes

Build & materials

Case material

Aluminum
Aluminum

Plate material

—
Polycarbonate

Keycaps

PBT
PBT

Weight

—
620 g

Backlight

RGB, south-facing
RGB

Firmware & software

QMK

No
Yes

VIA

Yes
Yes

Extras

Released

2023
2026

Where to buy

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.

Cidoo V872 stores
MMD KM402 stores

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