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Head to head · Prices checked Nov 12, 2026

Keychron J2 vs Redragon UCAL MAX K673

Get the Keychron J2 for qmk and via. Get the Redragon UCAL MAX K673 for the 4,000 mAh battery and knob.

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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 J2

Redragon UCAL MAX K673

  • Battery

    3,750 mAh

    4,000 mAh

    A larger battery means fewer cables during the day

  • Switch options

    Clicky, Linear, Tactile

    Linear

  • Knob

    No

    Yes

  • QMK

    Yes

    No

    The deep option when you want to remap every key

  • VIA

    Yes

    No

    GUI remapping without compiling firmware

KeebFinder scores

How we score
  • Keychron J2
  • Redragon UCAL MAX K673
Performance
69
66
Build quality
71
62
Productivity
73
69
Customizability
86
59
Portability
73
75

What they share

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

Full specs

Keychron J2 vs Redragon UCAL MAX K673 specs

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

8 of 22 specs differ

Keychron J2

Redragon UCAL MAX K673

Typing & switches

Switch options

Clicky, Linear, Tactile
Linear

Hot-swappable

Yes
Yes

Mount style

—
Gasket Mount

Sound dampening

Yes
Yes

Layout

Layout size

75%
75%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

No
Yes

Display

None
None

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

Keycaps

PBT
PBT

Weight

—
1,200 g

Dimensions

—
37 x 335 x 37 mm

Backlight

RGB
RGB

Firmware & software

QMK

Yes
No

VIA

Yes
No

Extras

Released

2025
2024

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 J23 stores

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