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Head to head · Prices checked Nov 11, 2026

Keychron K6 vs Redragon CASTOR K631 Pro SE

Get the Keychron K6 for the 4,000 mAh battery.

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Quick verdict

Which one should you get?

Get the

Keychron K6

Battery

Build quality in the top 45% of 65% boards under $100.

Rules this board out

  • North-facing LEDs. Cherry-profile keycaps can hit the switch housing.
  • South-facing LEDs. Shine-through legends stay dark, and some sculpted keycaps can clip the LED.

Get the

Redragon CASTOR K631 Pro SE

Build quality in the bottom 25% of 65% boards under $100.

Rules this board out

  • No ISO layout. ISO-DE, UK, and other ISO variants are not offered.

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 K6

Redragon CASTOR K631 Pro SE

  • Connection

    Bluetooth, Wired

    Bluetooth, 2.4 GHz, Wired

    Wireless for several devices and wired for lower latency

  • Battery

    4,000 mAh

    1,600 mAh

    A larger battery means fewer cables during the day

  • Case material

    ABS, Aluminum, Plastic

    Plastic

  • Switch options

    Clicky, Linear, Tactile

    Clicky, Linear

  • Mount style

    Plate Mount, Tray Mount

    Bottom Mount

KeebFinder scores

How we score
  • Keychron K6
  • Redragon CASTOR K631 Pro SE
Performance
54
70
Build quality
69
51
Productivity
58
49
Customizability
67
56
Portability
88
83

What they share

  • Layout size: 65%
  • Hot-swappable
See every spec side by side

Full specs

Keychron K6 vs Redragon CASTOR K631 Pro SE specs

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

12 of 20 specs differ

Keychron K6

Redragon CASTOR K631 Pro SE

Typing & switches

Switch options

Clicky, Linear, Tactile
Clicky, Linear

Hot-swappable

Yes
Yes

Mount style

Plate Mount, Tray Mount
Bottom Mount

Layout

Layout size

65%
65%

Layout standard

ANSI, ISO, ISO-DE, ISO-Nordic, ISO-UK, JIS
ANSI

Ergonomics

Standard
Standard

Display

None
None

Media keys

Yes
No

Connectivity & battery

Connection

Bluetooth, Wired
Bluetooth, 2.4 GHz, Wired

Battery

4,000 mAhBetter
1,600 mAh

USB-C

Yes
Yes

Build & materials

Case material

ABS, Aluminum, Plastic
Plastic

Plate material

Plastic
—

Keycaps

ABS, PBT
ABS

Weight

—
470 g

Dimensions

—
40 x 309 x 104 mm

Backlight

RGB, south-facing
RGB

Firmware & software

N-key rollover

No
Yes

Mac & Windows

Yes
No

Extras

Released

2020
2023

For EU buyers

ISO layouts by store

Which stores sell ISO-DE, UK, and the other regional layouts.

Keychron K6

  • Keychron

    ISO-UK

    In stockShips to you

  • Keychron

    ISO-DE

    In stockShips to you

  • Keychron

    ISO-Nordic

    Out of stockShips to you

  • MK

    ISO

    Out of stockShips to you

  • Keychron (DE)

    ISO-UK

    Out of stockDoes not ship to you

  • Keychron (DE)

    ISO-DE

    Out of stockDoes not ship to you

Redragon CASTOR K631 Pro SE

No ISO layout at the stores we track.

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 K64 stores

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