KBDFans MM HE M64 vs MMD KM21 UltraHE or QMK
Choose the KBDFans MM HE M64 for wired Hall Effect gaming features, or the MMD KM21 Ultra for wireless connectivity, four knobs, and broader customization.
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Which one should you get?
Get the
KBDFans MM HE M64
Hall effect
Build quality in the bottom 30% of Numpad boards under $100.
- Magnetic switches with rapid trigger, multi-trigger features, and macro support.
- 8000 Hz polling rate listed in the product specifications.
- Vendor describes a 60% layout that retains directional keys and is lightweight for travel.
- Magnetic switches only. Standard MX switches will not fit.
Get the
MMD KM21 Ultra
Hot-swappable
Build quality in the top 15% of Numpad boards under $100.
- Three connection modes: Bluetooth, 2.4 GHz, and wired, with a 980 mAh battery.
- CNC-machined aluminum case with a top-mount structure.
- QMK and VIA support, plus hot-swappable switches.
Pick the KBDFans MM HE M64 if your priority is a wired numpad with magnetic switches, rapid trigger, and an 8000 Hz polling rate. Choose the MMD KM21 Ultra if you want a ready-to-use device with wireless connectivity, QMK/VIA customization, and four programmable knobs. Check the MM HE M64's magnetic-only switch rule before buying replacement switches.
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.
KBDFans MM HE M64
MMD KM21 Ultra
Hall effect (magnetic)
Yes
No
Adjustable actuation helps in games and not in normal typing
Rapid trigger
Yes
No
Faster resets help in games and not in normal typing
Connection
Wired
Bluetooth, 2.4 GHz, Wired
Wireless for several devices and wired for lower latency
Hot-swappable
No
Yes
Switch changes without soldering
Knob
No
Yes
- KBDFans MM HE M64
- MMD KM21 Ultra
- Performance
- 9166
- Build quality
- 5481
- Productivity
- 5689
- Customizability
- 5988
- Portability
- 5985
- Layout size: Numpad
- Sound dampening
What will you mostly use it for?
The MM HE M64 is the focused pick for gaming features, especially if magnetic switches and rapid trigger are priorities. The KM21 Ultra leads in the other categories because it combines wireless options with QMK/VIA, hot-swap switches, and programmable knobs. The MM HE M64's travel-friendly vendor description is a point in its favor, but wired-only connectivity limits its flexibility on the move. For a numpad that doubles as a configurable macropad, the KM21 Ultra is the more versatile choice.
Pick the KBDFans MM HE M64
- The MM HE M64 has magnetic switches, rapid trigger, and an 8000 Hz polling rate.
- Its vendor description lists multiple trigger modes and on-board memory.
- The KM21 Ultra offers wired, 2.4 GHz, and Bluetooth connectivity, but its listed features do not include Hall Effect switches or rapid trigger.
KBDFans MM HE M64 vs MMD KM21 Ultra specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
12 of 23 specs differ
KBDFans MM HE M64
MMD KM21 Ultra
Switch options
Hall effect (magnetic)
Rapid trigger
Hot-swappable
Mount style
Sound dampening
Screw-in stabilizers
Layout size
Layout standard
Ergonomics
Knob
Display
Connection
Max polling rate
Battery
USB-C
Case material
Plate material
Backlight
QMK
VIA
Mac & Windows
Released
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KBDFans MM HE M64 vs MMD KM21 Ultra: your questions
The KBDFans MM HE M64 is the more gaming-focused option, with magnetic switches, rapid trigger, and an 8000 Hz polling rate. The KM21 Ultra has wired and wireless modes, but its listed features do not include Hall Effect switches or rapid trigger.
No. Its compatibility rule specifies magnetic switches only, and standard MX switches will not fit. Keep that restriction in mind when choosing replacement switches.
Yes. The KM21 Ultra supports Bluetooth, 2.4 GHz wireless, and wired USB-C connectivity, and it has a 980 mAh battery. The MM HE M64 is listed as wired-only.
The MMD KM21 Ultra lists both QMK and VIA support, including configurable keys and knobs. The MM HE M64 vendor description instead mentions a driver and four customizable keymap layers.
Yes. The KM21 Ultra has four clickable rotary knobs, and the vendor says they can be freely assigned through VIA. Suggested uses include volume, zoom, scrolling, and timeline scrubbing.
No. It is listed as a DIY kit or barebones product. Its vendor-listed contents include the PCB, FR4 plate, screw-in stabilizers, screws, a USB cable, and a foam kit.
Yes. The product is described as pre-built with MMD Cream linear switches and keycaps already installed. Its hot-swap sockets allow switches to be changed without soldering, according to the vendor.
The KM21 Ultra has Bluetooth and 2.4 GHz wireless connectivity, plus a 980 mAh battery, which can suit a cable-free setup. The MM HE M64 is wired-only, although its vendor describes the 60% layout as lightweight and suitable for travel.
The MMD KM21 Ultra is listed with a CNC-machined aluminum case and a top-mount structure. The MM HE M64 is listed with an FR4 plate, but its case material is not specified here.
The vendor says the MM HE M64 is compatible with Macs, but its driver software does not support Mac. The vendor advises setting it up on a PC first before using it with a Mac.
The KM21 Ultra has four clickable knobs that can be assigned to controls such as zoom, volume, and timeline scrubbing. QMK/VIA support also lets users customize the keys and knobs for creative workflows.
Yes. Both products list RGB lighting; the MM HE M64 vendor specifically describes per-key RGB and underglow. The KM21 Ultra product description lists RGB backlighting.
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