8BitDo Retro18 Numpad vs MMD KM21 Ultra
Get the 8BitDo Retro18 Numpad for the 1,000 mAh battery. Get the MMD KM21 Ultra for knob and qmk.
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.
8BitDo Retro18 Numpad
MMD KM21 Ultra
Battery
1,000 mAh
980 mAh
Case material
Aluminum, Plastic
Aluminum
Knob
No
Yes
Display
Yes
None
QMK
No
Yes
- 8BitDo Retro18 Numpad
- MMD KM21 Ultra
- Performance
- 5467
- Build quality
- 7082
- Productivity
- 4989
- Customizability
- 4989
- Portability
- 8386
- Layout size: Numpad
- Connection: Bluetooth, 2.4 GHz, Wired
- Hot-swappable
- Mount style: Top Mount
8BitDo Retro18 Numpad vs MMD KM21 Ultra specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
11 of 22 specs differ
8BitDo Retro18 Numpad
MMD KM21 Ultra
Hot-swappable
Mount style
Sound dampening
Layout size
Layout standard
Ergonomics
Knob
Display
Connection
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Dimensions
Backlight
QMK
VIA
N-key rollover
Mac & Windows
Released
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