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Head to head · Prices checked Nov 11, 2026

Jamesdonkey A3 3.0 vs Coolkiller CK75 SE

Get the Jamesdonkey A3 3.0 for knob and qmk. Get the Coolkiller CK75 SE for the 4,000 mAh battery.

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Quick verdict

Which one should you get?

Get the

Jamesdonkey A3 3.0

Knob

Build quality in the bottom 40% of 75% boards under $100.

Get the

Coolkiller CK75 SE

Battery

Build quality in the top 50% of 75% boards under $100.

Rules this board out

  • South-facing LEDs. Shine-through legends stay dark, and some sculpted keycaps can clip the LED.

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.

Jamesdonkey A3 3.0

Coolkiller CK75 SE

  • Battery

    3,750 mAh

    4,000 mAh

    A larger battery means fewer cables during the day

  • Knob

    Yes

    No

  • Display

    None

    LED

    A case display rather than a typing feature

  • QMK

    Yes

    No

    The deep option when you want to remap every key

  • Keycaps

    PBT

    PBT, PC

KeebFinder scores

How we score
  • Jamesdonkey A3 3.0
  • Coolkiller CK75 SE
Performance
53
75
Build quality
60
66
Productivity
80
77
Customizability
82
67
Portability
76
80

What they share

  • Layout size: 75%
  • Connection: Bluetooth, 2.4 GHz, Wired
  • Hot-swappable
  • Mount style: Gasket Mount
  • Sound dampening
See every spec side by side

Full specs

Jamesdonkey A3 3.0 vs Coolkiller CK75 SE specs

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

11 of 23 specs differ

Jamesdonkey A3 3.0

Coolkiller CK75 SE

Typing & switches

Hot-swappable

Yes
Yes

Mount style

Gasket Mount
Gasket Mount

Sound dampening

Yes
Yes

Layout

Layout size

75%
75%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

Yes
No

Display

None
LED

Media keys

Yes
No

Connectivity & battery

Connection

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

Max polling rate

—
1,000 Hz

Battery

3,750 mAh
4,000 mAhBetter

USB-C

No
Yes

Build & materials

Case material

—
Plastic

Plate material

—
Polycarbonate

Keycaps

PBT
PBT, PC

Weight

—
1,000 g

Dimensions

42 x 148 x 329 mm
40 x 326 x 139 mm

Backlight

RGB
RGB, south-facing

Firmware & software

QMK

Yes
No

N-key rollover

No
Yes

Mac & Windows

Yes
Yes

Extras

Released

2024
2026

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.

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