Head to head · Prices checked Nov 11, 2026

Epomaker EK21 vs MMD KM40

Get the Epomaker EK21 for knob. Get the MMD KM40 for the 2,000 mAh battery.

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Knob

Epomaker EK21

4.6 (36)4.6 · 36 reviews

from$33at Epomaker

90-day lowLowest price in 90 days

Compare 2 stores

Battery

MMD KM40

5.0 (4)5.0 · 4 reviews

from$84at MonacoKeys

Compare 2 stores

Quick verdict

Which one should you get?

Get the

Epomaker EK21

Knob

Build quality in the top 25% of Numpad boards under $50.

Rules this board out

Numpad only. This is not a full keyboard.

$33 at Epomaker

Get the

MMD KM40

Battery

Build quality in the top 10% of 40% boards under $150.

Rules this board out

Compact layout only. No function row, dedicated arrow keys, or numpad.

$84 at MonacoKeys

What actually differs

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.

Epomaker EK21

MMD KM40

Layout size
Numpad
40%
Battery
1,000 mAh
2,000 mAh
A larger battery means fewer cables during the day
Case material
ABS
Aluminum
Switch options
Linear, Silent
Linear, Tactile
Knob
Yes
No

KeebFinder scores

How we score

Epomaker EK21
MMD KM40

Performance: 77
60
Build quality: 76
82
Productivity: 87
69
Customizability: 82
83
Portability: 88
84

What they share

Connection: Bluetooth, 2.4 GHz, Wired
Hot-swappable
Mount style: Gasket Mount
VIA
Sound dampening
Plate material: Polycarbonate

See every spec side by side

From real owners

What owners say

Ratings and quotes collected from verified store reviews, including the critical ones.

Epomaker EK21

4.6

36 owner reviews

Praise

“Great wireless connectivity, sounds and feels as good as my 200$ custom keyboard. Great buy especially with the discount, would definitely buy again.”

Jared T.Verified buyer· via Epomaker

Critique

“I have had this thing for years, I have updated to every Json file and firmware file I can find and it has NEVER worked right, Either the Json file or the firmware is jacked up and no one at Epomaker can give me any explanation. This numpad is the reason I…”

Chris· via Epomaker

MMD KM40

5.0

4 owner reviews

Praise

“Keycaps are dyesub, but still PBT Tactile switches feature a proper tactile feeling with great typing experience The case feels and looks really premium layer activation could be nicer but in the end you just gotta get used to the board”

Andi· via MonacoKeys

Full specs

Epomaker EK21 vs MMD KM40 specs

Every tracked spec, side by side. Rows marked with a dot differ between the boards.

10 of 24 specs differ

Spec

Epomaker EK21

MMD KM40

Typing & switches

Switch options

Linear, Silent

Linear, Tactile

Hot-swappable

Yes

Mount style

Gasket Mount

Sound dampening

Yes

Layout

Layout size

Numpad

40%

Layout standard

ANSI

Ergonomics

Standard

Knob

Yes

Display

None

Connectivity & battery

Connection

Bluetooth, 2.4 GHz, Wired

Max polling rate

1,000 Hz

—

Battery

1,000 mAh

2,000 mAhBetter

USB-C

Yes

Build & materials

Case material

ABS

Aluminum

Plate material

Polycarbonate

Keycaps

PBT

Weight

200 g

620 g

Dimensions

29 x 138 x 93 mm

—

Backlight

RGB

Firmware & software

QMK

Yes

VIA

Yes

N-key rollover

Yes

Mac & Windows

Yes

Extras

Released

2025

2026

Where to buy

Compare prices

Live prices from the stores we track, cheapest in-stock offer first.

Prices in USD are converted to your currency and can change at any time. KeebFinder may earn a commission when you buy through these links, at no extra cost to you.

Lowest price across stores, Amazon excluded.

Epomaker EK212 stores