DOIO KBGM H10 vs MMD KM21 UltraOLED vs Knobs
Get the DOIO KBGM H10 for its OLED and dedicated game modes, or the MMD KM21 Ultra for four clickable knobs, wireless connectivity, and layered dampening.
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Which one should you get?
Get the
DOIO KBGM H10
OLED
Build quality in the top 15% of Numpad boards under $100.
- OLED screen and a vendor-described set of dedicated game modes.
- Vendor-listed CNC all-aluminum upper case and FR4 glass-fiber PCB.
Get the
MMD KM21 Ultra
Knobs
Build quality in the top 15% of Numpad boards under $100.
- Four clickable, freely assignable knobs for extra controls.
- Bluetooth and 2.4 GHz wireless connectivity with a 980mAh battery.
- PORON, IXPE, PET plate material, and bottom foam dampening.
Choose the DOIO KBGM H10 if you want an OLED and dedicated game modes, features the MMD KM21 Ultra does not offer. Choose the MMD KM21 Ultra if you want four clickable knobs, wireless connectivity, and named sound-dampening layers that the H10 does not list.
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.
DOIO KBGM H10
MMD KM21 Ultra
Connection
Wired
Bluetooth, 2.4 GHz, Wired
Wireless for several devices and wired for lower latency
Case material
Acrylic, Aluminum
Aluminum
Knob
No
Yes
Display
OLED
None
A case display rather than a typing feature
Sound dampening
No
Yes
- DOIO KBGM H10
- MMD KM21 Ultra
- Performance
- 6466
- Build quality
- 7981
- Productivity
- 7489
- Customizability
- 9089
- Portability
- 7285
- Layout size: Numpad
- Hot-swappable
- QMK
- VIA
What will you mostly use it for?
The H10 is the more gaming-oriented pick because its vendor description calls out game modes and it has an OLED. The KM21 Ultra suits office, travel, and creative setups that benefit from clickable knobs or wireless operation. For programming, its additional physical controls offer a workflow option, while both boards support QMK and VIA. Modding is a close match: each is hot-swappable and supports the same firmware tools, with different additional customization features.
Pick the DOIO KBGM H10
- The vendor describes four DJMAX, Muse Dash, OSU, and TAPSOMC BOLD game modes, plus five reserved modes.
- An OLED screen is listed for the H10, while the KM21 Ultra has no screen.
DOIO KBGM H10 vs MMD KM21 Ultra specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
6 of 21 specs differ
DOIO KBGM H10
MMD KM21 Ultra
Switch options
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
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DOIO KBGM H10 vs MMD KM21 Ultra: your questions
The H10 has an OLED screen and vendor-described game modes. The KM21 Ultra instead adds four clickable knobs, wireless connectivity, and layered sound dampening.
Yes, the H10’s listed features include an OLED screen. The KM21 Ultra is listed without a screen.
Yes, it has four clickable rotary knobs, which the vendor says can be assigned through VIA. The vendor suggests uses such as volume, zoom, and timeline scrubbing.
The MMD KM21 Ultra supports Bluetooth and 2.4 GHz wireless, as well as wired USB-C. The DOIO KBGM H10 is listed as wired-only.
Both models list hot-swappable switches. The H10 vendor description also specifies full-key hot-swap, while the KM21 Ultra listing describes its 17 keys as hot-swappable.
Yes, both product listings include QMK and VIA support. The H10 vendor description mentions custom layers, while the KM21 Ultra vendor describes assigning functions to its keys and knobs.
The H10 is the more gaming-focused option based on its vendor-described game modes for DJMAX, Muse Dash, OSU, and TAPSOMC BOLD. It also has an OLED screen, which the KM21 Ultra does not.
The KM21 Ultra has four clickable knobs that its vendor suggests using for timeline scrubbing, zoom, and volume. Those physical controls make it the more directly suited option for editing workflows.
The vendor lists PORON, IXPE, PET plate material, and bottom foam padding. The product metadata also lists sound dampening as a feature.
The vendor says the KM21 Ultra comes with MMD Cream linear switches preinstalled. Its listing also describes the switches as hot-swappable.
The H10 vendor description identifies Gateron Dwarf Silvery linear switches. It also gives their operating force and travel specifications, and describes the board as full-key hot-swappable.
Yes, the KM21 Ultra supports wired USB-C in addition to Bluetooth and 2.4 GHz wireless. The H10, by contrast, is listed as wired-only.
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