MMD KM21 Ultra vs Yunzii C21
Get the MMD KM21 Ultra for knob and qmk. Get the Yunzii C21 for the 2,500 mAh battery.
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Which one should you get?
Get the
Yunzii C21
Battery
Build quality in the bottom 50% of Numpad boards under $100.
- South-facing LEDs. Shine-through legends stay dark, and some sculpted keycaps can clip the LED.
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.
MMD KM21 Ultra
Yunzii C21
Battery
980 mAh
2,500 mAh
A larger battery means fewer cables during the day
Mount style
Top Mount
Gasket Mount
Knob
Yes
No
Display
None
TFT
A case display rather than a typing feature
QMK
Yes
No
The deep option when you want to remap every key
- MMD KM21 Ultra
- Yunzii C21
- Performance
- 6670
- Build quality
- 8163
- Productivity
- 8958
- Customizability
- 8966
- Portability
- 8688
- Layout size: Numpad
- Connection: Bluetooth, 2.4 GHz, Wired
- Hot-swappable
MMD KM21 Ultra vs Yunzii C21 specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
9 of 24 specs differ
MMD KM21 Ultra
Yunzii C21
Switch options
Hot-swappable
Mount style
Sound dampening
Layout size
Layout standard
Ergonomics
Knob
Display
Connection
Max polling rate
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Dimensions
Backlight
QMK
VIA
N-key rollover
Mac & Windows
Released
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