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Head to head · Prices checked Nov 7, 2026

AULA F75 Max vs Redragon CASTOR K631 Pro

Get the AULA F75 Max for the 4,000 mAh battery and knob.

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Quick verdict

Which one should you get?

Get the

AULA F75 Max

Battery

Build quality in the top 25% 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.
  • No numpad.

Get the

Redragon CASTOR K631 Pro

Build quality in the bottom 35% of 65% boards under $50.

Rules this board out

  • 65% layout. No function row and no numpad.

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.

AULA F75 Max

Redragon CASTOR K631 Pro

  • Layout size

    75%

    65%

  • Battery

    4,000 mAh

    1,600 mAh

    A larger battery means fewer cables during the day

  • Case material

    ABS

    Plastic

  • Mount style

    Gasket Mount

    Bottom Mount

  • Knob

    Yes

    No

KeebFinder scores

How we score
  • AULA F75 Max
  • Redragon CASTOR K631 Pro
Performance
78
71
Build quality
76
56
Productivity
91
54
Customizability
78
58
Portability
79
85

What they share

  • Connection: Bluetooth, 2.4 GHz, Wired
  • Hot-swappable
  • Switch options: Linear
See every spec side by side

Full specs

AULA F75 Max vs Redragon CASTOR K631 Pro specs

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

14 of 23 specs differ

AULA F75 Max

Redragon CASTOR K631 Pro

Typing & switches

Switch options

Linear
Linear

Hot-swappable

Yes
Yes

Mount style

Gasket Mount
Bottom Mount

Sound dampening

Yes
No

Screw-in stabilizers

Yes
No

Layout

Layout size

75%
65%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

Yes
No

Display

TFT
None

Connectivity & battery

Connection

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

Max polling rate

1,000 Hz
—

Battery

4,000 mAhBetter
1,600 mAh

USB-C

Yes
Yes

Build & materials

Case material

ABS
Plastic

Plate material

Plastic
—

Keycaps

PBT
ABS

Weight

960 g
470 g

Dimensions

44 x 328 x 143 mm
40 x 309 x 104 mm

Backlight

RGB, south-facing
RGB

Firmware & software

N-key rollover

Yes
Yes

Mac & Windows

Yes
No

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.

AULA F75 Max3 stores

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