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MMD KM21 Ultra - QMK/VIA Wireless Aluminium Macropad Numpad

MMD KM21 Ultra

The MMD KM21 Ultra Macropad Numpad is a compact, customizable input device designed for users who want more than just number entry. It suits power users, creatives, and macro enthusiasts needing a flexible pad with both keys and rotary controls. Its wireless and wired connectivity options make it adaptable for stationary or mobile setups. Users who value customization and multi-function control will find it useful, while those needing a full keyboard or extensive key count may find it limited.</p... Read more
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MMD KM21 Ultra

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MMD KM21 Ultra - QMK/VIA Wireless Aluminium Macropad Numpad

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Compare MMD KM21 Ultra vs Realforce Topre RT1 Numpad vs Keychron Q0 Max Numpad Specification

Compare similar keyboards side by side, or use the comparison table to compare all keyboards!
MMD KM21 UltraRealforce Topre RT1 NumpadKeychron Q0 Max Numpad
86
MMD KM21 Ultra - QMK/VIA Wireless Aluminium Macropad Numpad
Topre Realforce RT1 Numpad Keyboard
90
Keychron Q0 Max Aluminum Numpad Wireless Mechanical Keyboard
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  • Released in 2026
  • Uses a Top Mount mounting style
  • Equipped with a 980 mAh battery
  • Offers Yes, Rgb RGB lighting
  • Released in 2025
  • Supports Wired, Wired only connectivity
  • Made with a Plastic case
  • Offers No RGB lighting
  • Released in 2024
  • Has Tactile, Linear switch options
  • Includes screw-in stabilizers
  • Uses a Plate Mount mounting style
  • Runs at a 1000 Hz polling rate
  • Offers Yes, Rgb, South-face, Rgb South-face RGB lighting
Scores
  • Performance: 66.7
  • Build Quality: 81.7
  • Productivity: 89.5
  • Customizability: 89.9
  • Portability: 85.7
Scores
  • Performance: 52
  • Build Quality: 43.1
  • Productivity: 45.8
  • Customizability: 42.9
  • Portability: 66.8
Scores
  • Performance: 77.6
  • Build Quality: 83.7
  • Productivity: 94
  • Customizability: 92.2
  • Portability: 86.9
Name
MMD KM21 Ultra
Name
Realforce Topre RT1 Numpad
Name
Keychron Q0 Max Numpad
Release year
2026
Release year
2025
Release year
2024
Switch Options
-
Switch Options
-
Switch Options
Tactile, Linear
Profile
Normal Profile
Profile
Normal Profile
Profile
Normal Profile
Hot Swappable
 
Hot Swappable
 
Hot Swappable
 
Layout Size
Numpad
Layout Size
Numpad
Layout Size
Numpad
Layout Standard
ANSI
Layout Standard
ANSI
Layout Standard
ANSI
Layout Ergonomics
Normal
Layout Ergonomics
Normal
Layout Ergonomics
Normal
Knob Support
 
Knob Support
 
Knob Support
 
Display Support
 
Display Support
 
Display Support
 
Mac/Win Support
 
Mac/Win Support
 
Mac/Win Support
 
Multi-Media Keys
 
Multi-Media Keys
 
Multi-Media Keys
 
USB-C
 
USB-C
 
USB-C
 
USB passthrough
 
USB passthrough
 
USB passthrough
 
Connection
Bluetooth, 2.4 GHz, Wired, Wireless
Connection
Wired, Wired only
Connection
Bluetooth, 2.4 GHz, Wired, Wireless
Polling Rate
-
Polling Rate
-
Polling Rate
1000 Hz
Battery capacity
980 mAh
Battery capacity
-
Battery capacity
-
Hall Effect Support
 
Hall Effect Support
 
Hall Effect Support
 
QMK Support
 
QMK Support
 
QMK Support
 
VIA Support
 
VIA Support
 
VIA Support
 
VIAL Support
 
VIAL Support
 
VIAL Support
 
N-Key Rollover
 
N-Key Rollover
 
N-Key Rollover
 
Rapid Trigger
 
Rapid Trigger
 
Rapid Trigger
 
Mount Style
Top Mount
Mount Style
-
Mount Style
Plate Mount
Screw in Stabilizers
 
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
Rgb
Backlight
 
Backlight
 
Rgb, South-face
Case Colors
Case Colors
Case Colors
Case Material
Aluminum
Case Material
Plastic
Case Material
Aluminum
Keycaps Material
-
Keycaps Material
PBT
Keycaps Material
PBT
Dimensions
-
Dimensions
-
Dimensions
-
Weight
-
Weight
-
Weight
-
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Product Description

The MMD KM21 Ultra Macropad Numpad is a compact, customizable input device designed for users who want more than just number entry. It suits power users, creatives, and macro enthusiasts needing a flexible pad with both keys and rotary controls. Its wireless and wired connectivity options make it adaptable for stationary or mobile setups. Users who value customization and multi-function control will find it useful, while those needing a full keyboard or extensive key count may find it limited.

Key Features

  • 17 hot-swap keys allow easy switch replacement without soldering, enabling personalized typing feel.
  • Four clickable rotary knobs provide additional input for volume, scrolling, zoom, or custom macros, expanding control beyond a typical numpad.
  • Fully programmable via QMK/VIA firmware, letting users assign keys, macros, and layers without extra software installation.
  • RGB backlighting offers visual feedback and customization but does not affect functionality.

Build Quality

The case is CNC-machined aluminum, offering a solid and stable base with a premium feel. It uses a top-mount structure with multi-layer damping materials to reduce noise and provide consistent keypress acoustics. This construction minimizes hollow sounds and key pinging common in cheaper pads.

Connectivity

Tri-mode connectivity supports USB-C wired, 2.4 GHz wireless via receiver, and Bluetooth 5.0. This flexibility allows low-latency wired use, near-latency-free wireless with the receiver, or multi-device Bluetooth connections. A 980 mAh battery supports extended wireless use, though exact battery life is unknown.

Compatibility

Compatible with Windows, macOS, Linux, and via Bluetooth also Android and iOS. The QMK/VIA firmware supports extensive remapping and macro creation, suitable for diverse workflows including gaming, office tasks, and creative software control.

Trade-offs

  • Limited to 17 keys plus 4 rotary knobs, which may not suffice for users needing many dedicated keys.
  • Preinstalled linear switches may not suit users preferring tactile or clicky feedback, though switches can be swapped.
  • Battery life details are unspecified, so wireless endurance is uncertain.
  • The compact size means it is not a full keyboard replacement but a supplemental device.

Frequently Asked Questions (FAQ)

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