Head to head · Prices checked Oct 30, 2026

Jamesdonkey RS2 4.0 vs Keychron Lemokey X4

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Jamesdonkey RS2 4.0

from$99at Mechkeys

Compare 3 stores

Lemokey X4 QMK Wired Mechanical Keyboard

Keychron Lemokey X4

from$34at Keychron

Compare 2 stores

Quick verdict

Which one should you get?

Get the

Jamesdonkey RS2 4.0

Build quality in the top 35% of 96% boards under $100.

Rules this board out

Compact full-size layout. The numpad is present, the gaps of a full-size board are not.

$99 at Mechkeys

Get the

Keychron Lemokey X4

Build quality in the top 10% of 75% boards under $50.

Rules this board out

North-facing LEDs. Cherry-profile keycaps can hit the switch housing.
South-facing LEDs. Shine-through legends stay dark, and some sculpted keycaps can clip the LED.
No numpad.

$34 at Keychron

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.

Jamesdonkey RS2 4.0

Keychron Lemokey X4

Layout size
96%
75%
Connection
Bluetooth, 2.4 GHz, Wired
Wired
Wireless for several devices and wired for lower latency
Case material
Aluminum
ABS, Plastic
Switch options
Linear
Clicky, Linear, Tactile
Weight
1,150 g
712 g
Heavier boards stay planted and lighter ones travel

KeebFinder scores

How we score

Jamesdonkey RS2 4.0
Keychron Lemokey X4

Performance: 58
75
Build quality: 71
82
Productivity: 93
96
Customizability: 82
83
Portability: 53
65

What they share

Hot-swappable
Mount style: Gasket Mount
Knob
QMK
Sound dampening

See every spec side by side

Full specs

Jamesdonkey RS2 4.0 vs Keychron Lemokey X4 specs

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

11 of 26 specs differ

Spec

Jamesdonkey RS2 4.0

Keychron Lemokey X4

Typing & switches

Switch options

Linear

Clicky, Linear, Tactile

Hot-swappable

Yes

Mount style

Gasket Mount

Sound dampening

Yes

Screw-in stabilizers

Yes

Layout

Layout size

96%

75%

Layout standard

ANSI

Ergonomics

Standard

Knob

Yes

Display

None

Media keys

Yes

Connectivity & battery

Connection

Bluetooth, 2.4 GHz, Wired

Wired

Max polling rate

—

1,000 Hz

Battery

4,000 mAh

Wired only

USB-C

Yes

Build & materials

Case material

Aluminum

ABS, Plastic

Plate material

—

Polycarbonate

Keycaps

PBT

ABS, PBT

Weight

1,150 g

712 g

Dimensions

34 x 405 x 138 mm

41 x 325 x 145 mm

Typing angle

—

10°

Backlight

RGB

Yes, south-facing

Firmware & software

QMK

Yes

N-key rollover

Yes

Mac & Windows

Yes

Extras

Released

2024

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.

Jamesdonkey RS2 4.03 stores