Head to head · Prices checked Oct 31, 2026

DOIO KB04 01 vs Yunzii C21

Get the DOIO KB04 01 for knob.

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Knob

from$49at WhatGeek

from$54at Yunzii

Quick verdict

Which one should you get?

Get the

DOIO KB04 01

Knob

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.
Macropad only. This is not a full keyboard.

$49 at WhatGeek

Get the

Yunzii C21

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.
Numpad only. This is not a full keyboard.

$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.

DOIO KB04 01

Yunzii C21

Layout size
Macropad
Numpad
Connection
Wired
Bluetooth, 2.4 GHz, Wired
Wireless for several devices and wired for lower latency
Knob
Yes
No
Display
None
TFT
A case display rather than a typing feature
Weight
140 g
250 g
Heavier boards stay planted and lighter ones travel

KeebFinder scores

How we score

DOIO KB04 01
Yunzii C21

Performance: 70
70
Build quality: 82
63
Productivity: 86
58
Customizability: 92
66
Portability: 77
88

What they share

Hot-swappable
Switch options: Linear

See every spec side by side

Full specs

DOIO KB04 01 vs Yunzii C21 specs

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

10 of 22 specs differ

Spec

DOIO KB04 01

Yunzii C21

Typing & switches

Switch options

Linear

Hot-swappable

Yes

Mount style

—

Gasket Mount

Layout

Layout size

Macropad

Numpad

Layout standard

ANSI

—

Ergonomics

Standard

Knob

Yes

Display

None

TFT

Connectivity & battery

Connection

Wired

Bluetooth, 2.4 GHz, Wired

Max polling rate

—

1,000 Hz

Battery

Wired only

2,500 mAh

USB-C

Yes

Build & materials

Case material

Acrylic, Aluminum

—

Keycaps

—

PBT

Weight

140 g

250 g

Dimensions

32 x 54 x 85 mm

39 x 153 x 98 mm

Backlight

RGB, south-facing

Firmware & software

QMK

Yes

VIA

Yes

N-key rollover

Yes

Mac & Windows

Yes

Extras

Released

2022

2026

Where to buy

Compare prices

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

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Lowest price across stores, Amazon excluded.

DOIO KB04 012 stores