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Head to head · Prices checked Nov 7, 2026

Keychron B31 vs MelGeek O2

Get the MelGeek O2 for the 2,500 mAh battery.

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Quick verdict

Which one should you get?

Get the

Keychron B31

Build quality in the bottom 20% of 75% boards under $50.

Rules this board out

  • Switches are soldered. Swapping them means soldering.
  • No numpad.
$34 at MK

Get the

MelGeek O2

Battery

Build quality in the top 50% of Numpad boards under $150.

Rules this board out

  • Switches are soldered. Swapping them means soldering.
  • North-facing LEDs. Cherry-profile keycaps can hit the switch housing.
  • Numpad only. This is not a full keyboard.
$129 at MelGeek

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 B31

MelGeek O2

  • Layout size

    75%

    Numpad

  • Battery

    800 mAh

    2,500 mAh

    A larger battery means fewer cables during the day

  • Case material

    ABS, Plastic

    ABS, Aluminum, Polycarbonate

  • Mount style

    PCB Mount

    Gasket Mount

  • Weight

    520 g

    650 g

    Heavier boards stay planted and lighter ones travel

KeebFinder scores

How we score
  • Keychron B31
  • MelGeek O2
Performance
59
54
Build quality
52
65
Productivity
69
54
Customizability
47
50
Portability
78
83

What they share

  • Connection: Bluetooth, 2.4 GHz, Wired
  • Max polling rate: 1,000 Hz
See every spec side by side

Full specs

Keychron B31 vs MelGeek O2 specs

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

14 of 22 specs differ

Keychron B31

MelGeek O2

Typing & switches

Switch options

Clicky, Linear, Tactile
—

Mount style

PCB Mount
Gasket Mount

Sound dampening

No
Yes

Layout

Layout size

75%
Numpad

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Display

None
None

Media keys

Yes
No

Connectivity & battery

Connection

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

Max polling rate

1,000 Hz
1,000 Hz

Battery

800 mAh
2,500 mAhBetter

USB-C

Yes
No

Build & materials

Case material

ABS, Plastic
ABS, Aluminum, Polycarbonate

Plate material

—
Polycarbonate

Keycaps

ABS
PBT

Weight

520 g
650 g

Dimensions

26 x 138 x 327 mm
135 x 326 x 27 mm

Typing angle

5°
4°

Backlight

None
RGB, north-facing

Firmware & software

N-key rollover

Yes
No

Mac & Windows

Yes
Yes

Extras

Released

2026
2025

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.

Keychron B314 stores
MelGeek O22 stores

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