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Head to head · Prices checked Nov 2, 2026

Keychron K0 Max vs Yunzii C21

Get the Keychron K0 Max for knob. Get the Yunzii C21 for the 2,500 mAh battery.

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Quick verdict

Which one should you get?

Get the

Keychron K0 Max

Knob

Build quality in the top 10% of Numpad boards under $100.

Rules this board out

  • Low-profile switches and keycaps only. Standard MX keycaps will not fit.
  • North-facing LEDs. Cherry-profile keycaps can hit the switch housing.
$64 at Keychron

Get the

Yunzii C21

Battery

Build quality in the bottom 50% of Numpad boards under $100.

Rules this board out

  • South-facing LEDs. Shine-through legends stay dark, and some sculpted keycaps can clip the LED.
$54 at Yunzii

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 K0 Max

Yunzii C21

  • Battery

    750 mAh

    2,500 mAh

    A larger battery means fewer cables during the day

  • Low profile

    Yes

    No

  • Switch options

    Clicky, Linear, Silent, Tactile

    Linear

  • Mount style

    Plate Mount

    Gasket Mount

  • Knob

    Yes

    No

KeebFinder scores

How we score
  • Keychron K0 Max
  • Yunzii C21
Performance
79
70
Build quality
85
63
Productivity
95
58
Customizability
92
66
Portability
86
88

What they share

  • Layout size: Numpad
  • Connection: Bluetooth, 2.4 GHz, Wired
  • Hot-swappable
  • Max polling rate: 1,000 Hz
See every spec side by side

Full specs

Keychron K0 Max vs Yunzii C21 specs

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

13 of 25 specs differ

Keychron K0 Max

Yunzii C21

Typing & switches

Switch options

Clicky, Linear, Silent, Tactile
Linear

Hot-swappable

Yes
Yes

Mount style

Plate Mount
Gasket Mount

Low profile

Yes
No

Sound dampening

Yes
No

Screw-in stabilizers

Yes
No

Layout

Layout size

Numpad
Numpad

Layout standard

ANSI
—

Ergonomics

Standard
Standard

Knob

Yes
No

Display

None
TFT

Connectivity & battery

Connection

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

Max polling rate

1,000 Hz
1,000 Hz

Battery

750 mAh
2,500 mAhBetter

USB-C

Yes
Yes

Build & materials

Case material

Aluminum, Plastic
—

Keycaps

PBT, POM
PBT

Weight

—
250 g

Dimensions

—
39 x 153 x 98 mm

Backlight

RGB, north-facing
RGB, south-facing

Firmware & software

QMK

Yes
No

VIA

Yes
No

N-key rollover

Yes
Yes

Mac & Windows

Yes
Yes

Extras

Released

2025
2026

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 K0 Max3 stores
Yunzii C212 stores

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