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Head to head · Prices checked Nov 11, 2026

DOIO KB03 04 vs Zuoya GMK21 Numpad

Get the DOIO KB03 04 for mac & windows and usb-c. Get the Zuoya GMK21 Numpad for knob.

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Quick verdict

Which one should you get?

Get the

DOIO KB03 04

Mac & Windows

Rules this board out

  • Macropad only. This is not a full keyboard.

Get the

Zuoya GMK21 Numpad

Knob

Build quality in the top 10% of Numpad boards under $50.

Rules this board out

  • Numpad only. This is not a full keyboard.

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 KB03 04

Zuoya GMK21 Numpad

  • Layout size

    Macropad

    Numpad

  • Knob

    No

    Yes

  • Mac & Windows

    Yes

    No

  • Released

    2023

    2026

  • USB-C

    Yes

    No

KeebFinder scores

How we score
  • DOIO KB03 04
  • Zuoya GMK21 Numpad
Performance
67
61
Build quality
80
79
Productivity
82
65
Customizability
89
94
Portability
77
65

What they share

  • Hot-swappable
  • QMK
  • VIA
See every spec side by side

Full specs

DOIO KB03 04 vs Zuoya GMK21 Numpad specs

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

5 of 16 specs differ

DOIO KB03 04

Zuoya GMK21 Numpad

Typing & switches

Hot-swappable

Yes
Yes

Layout

Layout size

Macropad
Numpad

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

No
Yes

Display

None
None

Connectivity & battery

Connection

Wired
—

USB-C

Yes
No

Build & materials

Case material

Acrylic, Aluminum
—

Weight

205 g
—

Dimensions

23 x 78 x 104 mm
—

Backlight

RGB
RGB

Firmware & software

QMK

Yes
Yes

VIA

Yes
Yes

Mac & Windows

Yes
No

Extras

Released

2023
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.

DOIO KB03 042 stores

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