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Head to head · Prices checked Nov 11, 2026

Coolkiller CK98 vs MelGeek O2

Get the Coolkiller CK98 for hot-swappable and the 3,750 mAh battery.

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Quick verdict

Which one should you get?

Get the

Coolkiller CK98

Hot-swappable

Build quality in the top 45% of 98% boards under $300.

Rules this board out

  • South-facing LEDs. Shine-through legends stay dark, and some sculpted keycaps can clip the LED.
  • Compact full-size layout. The numpad is present, the gaps of a full-size board are not.

Get the

MelGeek O2

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.

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.

Coolkiller CK98

MelGeek O2

  • Layout size

    98%

    Numpad

  • Hot-swappable

    Yes

    No

    Switch changes without soldering

  • Battery

    3,750 mAh

    2,500 mAh

    A larger battery means fewer cables during the day

  • Case material

    Aluminum, Plastic

    ABS, Aluminum, Polycarbonate

  • Display

    TFT

    None

    A case display rather than a typing feature

KeebFinder scores

How we score
  • Coolkiller CK98
  • MelGeek O2
Performance
65
54
Build quality
65
65
Productivity
87
53
Customizability
73
50
Portability
56
82

What they share

  • Connection: Bluetooth, 2.4 GHz, Wired
  • Mount style: Gasket Mount
  • Sound dampening
See every spec side by side

Full specs

Coolkiller CK98 vs MelGeek O2 specs

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

13 of 23 specs differ

Coolkiller CK98

MelGeek O2

Typing & switches

Switch options

Linear, Silent, Tactile
—

Hot-swappable

Yes
No

Mount style

Gasket Mount
Gasket Mount

Sound dampening

Yes
Yes

Screw-in stabilizers

Yes
No

Layout

Layout size

98%
Numpad

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Display

TFT
None

Connectivity & battery

Connection

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

Max polling rate

—
1,000 Hz

Battery

3,750 mAhBetter
2,500 mAh

USB-C

Yes
No

Build & materials

Case material

Aluminum, Plastic
ABS, Aluminum, Polycarbonate

Plate material

—
Polycarbonate

Keycaps

ABS, PBT, PC
PBT

Weight

1,300 g
650 g

Dimensions

45 x 390 x 144 mm
135 x 326 x 27 mm

Typing angle

—
4°

Backlight

RGB, south-facing
RGB, north-facing

Firmware & software

N-key rollover

Yes
No

Mac & Windows

Yes
Yes

Extras

Released

2022
2025

Where to buy

Compare prices

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

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Lowest price across stores, Amazon excluded.

MelGeek O22 stores

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