MMD KM21 Ultra vs Weikav Stars21 Numpad
Choose the MMD KM21 Ultra for four clickable knobs and hot-swap switches, or the Weikav Stars21 for its gasket mount and 21-key layout.
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Which one should you get?
Get the
MMD KM21 Ultra
Hot-swappable
Build quality in the top 15% of Numpad boards under $100.
- Four clickable knobs can be assigned through VIA.
- Hot-swap sockets allow switches to be changed without soldering.
- The vendor lists MMD Cream linear switches as preinstalled.
Get the
Weikav Stars21 Numpad
Build quality in the top 20% of Numpad boards under $100.
- The 21-key layout provides more keys than the KM21 Ultra’s listed 17.
- Gasket-mounted structure uses soft gasket mounts and silicone particles, according to the vendor.
- The aluminum case is described as CNC-machined from 6063-series aluminum alloy.
- Switches are soldered. Swapping them means soldering.
Choose the MMD KM21 Ultra if you want clickable knobs for dedicated controls or plan to change switches without soldering. Pick the Weikav Stars21 if its 21-key layout and gasket-mounted structure matter more, and you are comfortable with soldered switches. Both offer QMK and VIA support and tri-mode connectivity.
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
Weikav Stars21 Numpad
Hot-swappable
Yes
No
Switch changes without soldering
Battery
980 mAh
800 mAh
A larger battery means fewer cables during the day
Mount style
Top Mount
Gasket Mount
Knob
Yes
No
Sound dampening
Yes
No
- MMD KM21 Ultra
- Weikav Stars21 Numpad
- Performance
- 6659
- Build quality
- 8179
- Productivity
- 8968
- Customizability
- 8975
- Portability
- 8583
- Layout size: Numpad
- Connection: Bluetooth, 2.4 GHz, Wired
- Case material: Aluminum
- QMK
- VIA
What will you mostly use it for?
The KM21 Ultra has the clearest edge for workflows that benefit from knobs, custom assignments, or switch changes. Both are configurable through QMK and VIA, but only the MMD listing describes four clickable knobs and hot-swap switches. The Stars21 is a practical travel consideration because its dimensions and weight are listed, though the KM21 Ultra has the larger stated battery. For a conventional programmable numpad with a gasket mount and 21 keys, the Stars21 offers a different layout and structure.
Pick the MMD KM21 Ultra
- The KM21 Ultra has four clickable knobs that can be assigned to controls through VIA.
- Its 17 hot-swap keys can be changed without soldering, according to the vendor.
MMD KM21 Ultra vs Weikav Stars21 Numpad specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
6 of 20 specs differ
MMD KM21 Ultra
Weikav Stars21 Numpad
Hot-swappable
Mount style
Sound dampening
Layout size
Layout standard
Ergonomics
Knob
Display
Connection
Battery
USB-C
Case material
Plate material
Weight
Dimensions
Backlight
QMK
VIA
Mac & Windows
Released
Compare prices
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MMD KM21 Ultra vs Weikav Stars21 Numpad: your questions
The KM21 Ultra has 17 hot-swap keys and four clickable knobs, while the Stars21 is listed as a 21-key numpad with a gasket mount. Both support QMK and VIA and offer Bluetooth, 2.4 GHz, and wired connectivity.
Yes, the KM21 Ultra has hot-swap sockets, and its vendor says switches can be changed without soldering. The vendor lists MMD Cream linear switches as preinstalled.
The Stars21’s switches are soldered, so swapping them requires soldering. The vendor lists KTT Rouge linear switches as the installed switch type.
The MMD KM21 Ultra has four clickable knobs, which can be assigned through VIA according to its vendor. The Stars21 listing does not describe knobs.
Yes, QMK and VIA support are listed for both the KM21 Ultra and Stars21. The KM21 Ultra vendor specifically describes assigning functions to its keys and clickable knobs through VIA.
The KM21 Ultra has a listed 980 mAh battery, compared with 800 mAh for the Stars21. These figures describe battery capacity, not expected runtime.
Both list Bluetooth, 2.4 GHz wireless, and wired connectivity. The KM21 Ultra vendor specifies USB-C, 2.4 GHz, and Bluetooth 5.0.
The KM21 Ultra has four clickable knobs that its vendor describes assigning to tasks such as timeline scrubbing, zoom, and volume. The Stars21 listing does not describe knobs.
The Stars21 is listed at 35 x 130 x 95 mm and 460 g. The KM21 Ultra’s metadata does not list dimensions or weight.
The KM21 Ultra uses a top-mount structure, while the Stars21 uses a gasket-mounted structure. The Stars21 vendor also describes soft gasket mounts and silicone particles in the PCB.
The KM21 Ultra is easier to customize by changing switches because it has hot-swap sockets. The Stars21’s switches are soldered, so changing them requires soldering.
RGB lighting is listed for both the KM21 Ultra and Stars21. The Stars21 vendor describes RGB in its patterned upper-right corner.
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