MMD KM40 vs KEEBD Rhymestone Split OrtholinearWireless vs Split
Choose the prebuilt, tri-mode MMD KM40 for convenience and wireless flexibility, or the KEEBD Rhymestone for a DIY split ortholinear build with OLED displays.
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from$84at MonacoKeys
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from$80at KEEBD
Which one should you get?
Get the
MMD KM40
Wireless
Build quality in the top 10% of 40% boards under $150.
- CNC aluminum case, polycarbonate plate, and gasket mount.
- Bluetooth, 2.4 GHz, and wired USB-C connectivity, with a 2000mAh battery.
- Hot-swappable and supports QMK and VIA.
Get the
KEEBD Rhymestone Split Ortholinear
Split
Build quality in the bottom 10% of 40% boards under $150.
- Split ortholinear 40% layout with a 40-key design.
- Kit includes FR4 switch plates, PCBs, acrylic plates, and OLED displays.
- Hot-swap sockets are included for MX switches.
Choose the MMD KM40 if you want a complete compact keyboard with wireless options, aluminum construction, and QMK/VIA support. Choose the KEEBD Rhymestone if the split ortholinear format and DIY build are the main attractions, and you are prepared to source the required controllers, switches, and keycaps. The KM40 prioritizes immediate usability, while the Rhymestone offers a more build-focused starting point.
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 Rhymestone Split Ortholinear
Ergonomics
Standard
Split, Ortholinear
Case material
Aluminum
Acrylic, Plastic
Switch options
Linear, Tactile
Tactile
Display
None
Yes
A case display rather than a typing feature
QMK
Yes
No
The deep option when you want to remap every key
- MMD KM40
- KEEBD Rhymestone Split Ortholinear
- Performance
- 6042
- Build quality
- 8244
- Productivity
- 6951
- Customizability
- 8374
- Portability
- 8463
- Layout size: 40%
- Hot-swappable
What will you mostly use it for?
The KM40 is the more straightforward fit for gaming, office use, travel, and content creation because it arrives assembled and offers three connection modes. Its QMK/VIA support and vendor-described layer options also make it a practical choice for programming. The Rhymestone stands out for modding, with a kit format and a split ortholinear design that invites a more hands-on build. Buyers should account for its required components before treating it as a ready-to-use alternative.
Pick the MMD KM40
- The KM40 offers wired USB-C and 2.4 GHz wireless connections.
- It is a pre-built keyboard with switches and keycaps already installed.
- The Rhymestone is a kit that requires Pro Micro controllers, MX switches, and keycaps to complete.
MMD KM40 vs KEEBD Rhymestone Split Ortholinear specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
10 of 19 specs differ
MMD KM40
KEEBD Rhymestone Split Ortholinear
Switch options
Hot-swappable
Mount style
Sound dampening
Layout size
Layout standard
Ergonomics
Display
Connection
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Backlight
QMK
VIA
Released
Compare prices
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MMD KM40 vs KEEBD Rhymestone Split Ortholinear: your questions
Yes. The KM40 supports Bluetooth and 2.4 GHz wireless, as well as wired USB-C. Its listed battery capacity is 2000mAh.
No, it is sold as a kit. The vendor lists Pro Micro controllers, MX switches, and 40 MX keycaps as required to complete it.
Both are 40% keyboards, but the KM40 uses a standard layout while the Rhymestone is split and ortholinear. The Rhymestone vendor describes it as a 40-key keyboard.
The MMD KM40 is listed with QMK and VIA support. Its vendor description also says it supports up to 10 layers and macros.
Yes. The kit includes two OLED displays and two acrylic OLED cover plates. The vendor lists the displays as .91 inches.
The MMD KM40 is pre-built, with switches and keycaps already installed. The Rhymestone is a kit that needs additional components and assembly.
Yes. The KM40 is listed as hot-swappable, and its vendor description says its switches can be changed without soldering. It comes pre-built with switches installed.
The vendor lists Pro Micro controllers, MX switches, and 40 MX keycaps as required. The kit itself includes 40 Kailh hot-swap sockets, along with the PCBs and plates.
The KM40 has a listed weight of 620g and offers Bluetooth and 2.4 GHz wireless modes. The Rhymestone is a split kit with extra completion requirements, so the KM40 is the simpler travel-ready option based on its listed features.
The KM40 is listed with an aluminum case, polycarbonate plate, and PBT keycaps. Its vendor description further identifies the case as CNC-milled 6063 aluminum and mentions Poron and IXPE sound-dampening materials.
The kit includes FR4 switch plates, PCBs, acrylic bottom plates, and hot-swap sockets. Optional items include SK6812MINI RGB LEDs and headers that enable controller or display hot-swap.
Neither product has a compatibility rule listed. The KM40 vendor description names Windows, macOS, and Linux, while the Rhymestone vendor page identifies required hardware components for completing the kit.
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