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Head to head · Prices checked Oct 21, 2026

Redragon CASTOR K631 Pro vs Yunzii AL66

Get the Yunzii AL66 for the 4,600 mAh battery and knob.

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.

Redragon CASTOR K631 Pro

Yunzii AL66

  • Battery

    1,600 mAh

    4,600 mAh

  • Case material

    Plastic

    Aluminum

  • Switch options

    Linear

    Clicky

  • Mount style

    Bottom Mount

    Gasket Mount, Plate Mount

  • Knob

    No

    Yes

KeebFinder scores

How we score
  • Redragon CASTOR K631 Pro
  • Yunzii AL66
Performance
72
73
Build quality
57
75
Productivity
54
78
Customizability
58
75
Portability
85
89

What they share

  • Layout size: 65%
  • Connection: Bluetooth, 2.4 GHz, Wired
  • Hot-swappable
See every spec side by side

Full specs

Redragon CASTOR K631 Pro vs Yunzii AL66 specs

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

13 of 22 specs differ

Redragon CASTOR K631 Pro

Yunzii AL66

Typing & switches

Switch options

Linear
Clicky

Hot-swappable

Yes
Yes

Mount style

Bottom Mount
Gasket Mount, Plate Mount

Sound dampening

No
Yes

Layout

Layout size

65%
65%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

No
Yes

Display

None
None

Media keys

No
Yes

Connectivity & battery

Connection

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

Battery

1,600 mAh
4,600 mAhBetter

USB-C

Yes
Yes

Build & materials

Case material

Plastic
Aluminum

Plate material

—
Polycarbonate

Keycaps

ABS
PBT

Weight

470 g
1,145 g

Dimensions

40 x 309 x 104 mm
42 x 113 x 322 mm

Backlight

RGB
RGB, south-facing

Firmware & software

N-key rollover

Yes
Yes

Mac & Windows

No
Yes

Extras

Released

2026
2023

Where to buy

Compare prices

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

Lowest price across stores, Amazon excluded.

  • RedragonCN

    In stock
    $42Visit
  • AmazonGlobal

    Check price
    ~$42Visit
Yunzii AL663 stores
  • AmazonGlobal

    Check price
    ~$64Visit
  • YunziiCN

    Out of stock
    $64Visit
  • MKUS

    Out of stock
    $90Visit

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.

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