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Head to head · Prices checked Oct 21, 2026

Fantech MAXFIT81 MK910 vs Keychron J4 QMK

Get the Fantech MAXFIT81 MK910 for 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.

Fantech MAXFIT81 MK910

Keychron J4 QMK

  • Layout size

    75%

    80%

  • Connection

    Bluetooth, Wired, 2.4 GHz

    Bluetooth, 2.4 GHz, Wired

  • Case material

    ABS, Aluminum

    ABS

  • Knob

    Yes

    No

  • Display

    OLED

    None

KeebFinder scores

How we score
  • Fantech MAXFIT81 MK910
  • Keychron J4 QMK
Performance
63
79
Build quality
68
61
Productivity
83
84
Customizability
82
74
Portability
81
73

What they share

  • Hot-swappable
  • Battery: 4,000 mAh
  • Sound dampening
See every spec side by side

Full specs

Fantech MAXFIT81 MK910 vs Keychron J4 QMK specs

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

12 of 24 specs differ

Fantech MAXFIT81 MK910

Keychron J4 QMK

Typing & switches

Switch options

Clicky, Linear, Tactile
—

Hot-swappable

Yes
Yes

Mount style

Gasket Mount
—

Sound dampening

Yes
Yes

Layout

Layout size

75%
80%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

Yes
No

Display

OLED
None

Connectivity & battery

Connection

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

Max polling rate

—
1,000 Hz

Battery

4,000 mAh
4,000 mAh

USB-C

Yes
Yes

Build & materials

Case material

ABS, Aluminum
ABS

Plate material

FR4
Steel

Keycaps

ABS, PBT
PBT

Weight

1,093 g
870 g

Dimensions

45 x 303 x 104 mm
38 x 366 x 138 mm

Typing angle

—
10°

Backlight

RGB, south-facing
RGB, north-facing

Firmware & software

QMK

No
Yes

N-key rollover

Yes
Yes

Mac & Windows

Yes
Yes

Extras

Released

2023
2025

Where to buy

Compare prices

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

Lowest price across stores, Amazon excluded.

  • MechkeysCN

    In stock
    $109Visit
  • AmazonGlobal

    Check price
    ~$109Visit
  • WhatGeekCN

    Out of stock
    $88Visit
  • Keychron (DE)DE

    In stock
    $98Visit
  • AmazonGlobal

    Check price
    ~$98Visit

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