MMD KM40 vs KEEBD Reviung 39 IIReady vs DIY
Choose the MMD KM40 for a ready-to-use keyboard with wireless and QMK/VIA, or the KEEBD Reviung 39 II if you want to assemble a 39-key kit with an FR4 plate.
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Which one should you get?
Get the
MMD KM40
Ready
Build quality in the top 10% of 40% boards under $150.
- CNC aluminum case, with an O-ring gasket mount and vendor-described Poron and IXPE sound-dampening materials.
- Hot-swap PCB with QMK and VIA support.
- USB-C wired, 2.4 GHz, and Bluetooth connectivity, plus a 2000mAh battery.
Get the
KEEBD Reviung 39 II
DIY
Build quality in the bottom 15% of 40% boards under $150.
- 39-key column-staggered layout.
- Kit includes an FR4 switch plate, acrylic bottom plate, and acrylic controller cover.
- Includes Kailh hot-swap sockets and screw-in stabilizers are listed in the product metadata.
Choose the MMD KM40 if you want a compact keyboard that is ready to use, with wireless connectivity, a 2000mAh battery, and QMK/VIA support. Pick the KEEBD Reviung 39 II if the priority is assembling a 39-key board around its FR4 plate and acrylic kit parts. Remember that the Reviung kit requires a Pro Micro controller, MX switches, and MX keycaps to complete.
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 KM40
KEEBD Reviung 39 II
Case material
Aluminum
Acrylic, Plastic
Switch options
Linear, Tactile
Tactile
QMK
Yes
No
The deep option when you want to remap every key
VIA
Yes
No
GUI remapping without compiling firmware
Sound dampening
Yes
No
- MMD KM40
- KEEBD Reviung 39 II
- Performance
- 6042
- Build quality
- 8244
- Productivity
- 6949
- Customizability
- 8374
- Portability
- 8464
- Layout size: 40%
- Hot-swappable
What will you mostly use it for?
The KM40 is the more practical pick for gaming, office use, programming, travel, and content creation, mainly because it is a finished keyboard with specified wireless options and QMK/VIA support. The Reviung stands out for hands-on building, with its FR4 plate and acrylic kit components. Both have hot-swap support, but the Reviung requires additional parts to complete. If assembly is the goal, its kit format is the defining advantage.
Pick the MMD KM40
- The KM40 offers USB-C wired, 2.4 GHz, and Bluetooth connectivity; the Reviung listing does not specify connectivity options.
- The KM40 is pre-built, while the Reviung requires a Pro Micro controller, switches, and keycaps to complete.
MMD KM40 vs KEEBD Reviung 39 II specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
9 of 20 specs differ
MMD KM40
KEEBD Reviung 39 II
Switch options
Hot-swappable
Mount style
Sound dampening
Screw-in stabilizers
Layout size
Layout standard
Ergonomics
Display
Connection
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Backlight
QMK
VIA
Released
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MMD KM40 vs KEEBD Reviung 39 II: your questions
The MMD KM40 is the simpler starting point because it is supplied pre-built with switches and keycaps installed. The Reviung 39 II is a kit that requires a Pro Micro controller, MX switches, and MX keycaps.
Yes. The KM40 supports Bluetooth and 2.4 GHz wireless, as well as USB-C wired connectivity. Its vendor description specifies Bluetooth 5.0 and pairing with up to three devices.
No, the Reviung 39 II is listed as a keyboard kit. Its required-to-complete items include a Pro Micro controller, 39 MX switches, and 39 MX keycaps.
The MMD KM40 lists QMK and VIA support, and its vendor description says keys can be remapped and macros assigned. The Reviung product description does not specify QMK or VIA support.
Both list hot-swap support. The KM40 has a hot-swap PCB, while the Reviung kit includes 39 Kailh hot-swap sockets.
The KM40 has a specified weight of 620g, compact vendor-listed dimensions, Bluetooth and 2.4 GHz connectivity, and a 2000mAh battery. The Reviung listing does not specify its weight, battery, or wireless connectivity.
The kit includes an FR4 switch plate, Reviung PCB, acrylic bottom plate and controller cover, Kailh hot-swap sockets, and mounting hardware. A Pro Micro controller, MX switches, and MX keycaps are listed as required to complete the build.
Yes, its kit includes an FR4 switch plate. The MMD KM40 instead lists a polycarbonate plate.
Yes, the KM40 is described as fully built, with switches and keycaps installed. The vendor lists PBT keycaps, while the metadata includes linear and tactile switch types.
The Reviung kit listing includes WS2812B rear-facing RGB LEDs as optional items, rather than kit-included components. The KM40 lists RGB lighting as a feature.
The MMD KM40 has an aluminum case, described by its vendor as CNC-machined. The Reviung 39 II kit includes an acrylic bottom plate and acrylic controller cover.
The Reviung 39 II is a strong fit for buyers who want to assemble a kit with an FR4 plate, acrylic parts, and optional RGB LEDs. The KM40 is also customizable through hot-swap switches and QMK/VIA, but it arrives fully built.
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