Head to head · Prices checked Oct 30, 2026

Jamesdonkey RS2 4.0 vs Keychron K3 Pro

Get the Jamesdonkey RS2 4.0 for the 4,000 mAh battery.

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Battery

Jamesdonkey RS2 4.0

No reviews

from$99at Mechkeys

Compare 3 stores

Keychron K3 Pro

4.7 · 54 reviews

from$67at Keychron

Compare 4 stores

Quick verdict

Which one should you get?

Get the

Jamesdonkey RS2 4.0

Battery

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

Rules this board out

No ISO layout. ISO-DE, UK, and other ISO variants are not offered.
Compact full-size layout. The numpad is present, the gaps of a full-size board are not.

$99 at Mechkeys

Get the

Keychron K3 Pro

Build quality in the top 15% of 75% boards under $100.

Rules this board out

Low-profile switches and keycaps only. Standard MX keycaps will not fit.
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.

$67 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 K3 Pro

Layout size
96%
75%
Connection
Bluetooth, 2.4 GHz, Wired
Bluetooth, Wired
Wireless for several devices and wired for lower latency
Battery
4,000 mAh
1,550 mAh
A larger battery means fewer cables during the day
Low profile
No
Yes
Case material
Aluminum
ABS, Aluminum, Plastic

KeebFinder scores

How we score

Jamesdonkey RS2 4.0
Keychron K3 Pro

Performance: 58
81
Build quality: 71
81
Productivity: 93
80
Customizability: 82
88
Portability: 53
77

What they share

Hot-swappable
QMK

See every spec side by side

Full specs

Jamesdonkey RS2 4.0 vs Keychron K3 Pro specs

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

17 of 26 specs differ

Spec

Jamesdonkey RS2 4.0

Keychron K3 Pro

Typing & switches

Switch options

Linear

Clicky, Linear, Tactile

Hot-swappable

Yes

Mount style

Gasket Mount

Plate Mount, Tray Mount

Low profile

Yes

Sound dampening

Yes

Layout

Layout size

96%

75%

Layout standard

ANSI

ANSI, ISO, ISO-DE, ISO-ES, ISO-FR, ISO-Nordic, ISO-SW, ISO-UK, JIS

Ergonomics

Standard

Knob

Yes

Display

None

Media keys

Yes

Connectivity & battery

Connection

Bluetooth, 2.4 GHz, Wired

Bluetooth, Wired

Max polling rate

—

1,000 Hz

Battery

4,000 mAhBetter

1,550 mAh

USB-C

Yes

Build & materials

Case material

Aluminum

ABS, Aluminum, Plastic

Plate material

—

Plastic

Keycaps

PBT

ABS, PBT

Weight

1,150 g

525 g

Dimensions

34 x 405 x 138 mm

15 x 306 x 116 mm

Backlight

RGB

RGB, south-facing

Firmware & software

QMK

Yes

VIA

Yes

N-key rollover

Yes

Mac & Windows

Yes

Extras

Released

2024

2022

For EU buyers

ISO layouts by store

Which stores sell ISO-DE, UK, and the other regional layouts.

Jamesdonkey RS2 4.0

No ISO layout at the stores we track.

Keychron K3 Pro

Keychron
ISO-DE, ISO-UK, ISO-Nordic, ISO-FR, ISO-ES, ISO-SW
Out of stockShips to you
Keychron (DE)
ISO-DE, ISO-UK, ISO-Nordic, ISO-FR, ISO-ES, ISO-SW
Out of stockDoes not ship to you

Where to buy

Compare prices

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

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Lowest price across stores, Amazon excluded.

Jamesdonkey RS2 4.03 stores