Head to head · Prices checked Oct 29, 2026

Jamesdonkey RS2 4.0 vs Keychron K3 Max

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 Max

4.1 · 16 reviews

from$89at MK

Compare 6 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 Max

Build quality in the top 5% 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.
No numpad.

$89 at MK

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 Max

Layout size
96%
75%
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, Wood
Switch options
Linear
Clicky, Linear, Tactile

KeebFinder scores

How we score

Jamesdonkey RS2 4.0
Keychron K3 Max

Performance: 58
81
Build quality: 71
86
Productivity: 93
94
Customizability: 82
91
Portability: 53
77

What they share

Connection: Bluetooth, 2.4 GHz, Wired
Hot-swappable
QMK
Sound dampening

See every spec side by side

Full specs

Jamesdonkey RS2 4.0 vs Keychron K3 Max specs

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

16 of 28 specs differ

Spec

Jamesdonkey RS2 4.0

Keychron K3 Max

Typing & switches

Switch options

Linear

Clicky, Linear, Tactile

Hot-swappable

Yes

Mount style

Gasket Mount

Plate Mount

Low profile

Yes

Sound dampening

Yes

Screw-in stabilizers

Yes

Layout

Layout size

96%

75%

Layout standard

ANSI

ANSI, ISO, ISO-DE, ISO-Nordic, ISO-SW, ISO-UK

Ergonomics

Standard

Knob

Yes

Display

None

Media keys

Yes

Connectivity & battery

Connection

Bluetooth, 2.4 GHz, 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, Wood

Plate material

—

Aluminum, Plastic, Polycarbonate

Keycaps

PBT

ABS, PBT

Weight

1,150 g

580 g

Dimensions

34 x 405 x 138 mm

22 x 306 x 116 mm

Typing angle

—

3°, 7°

Backlight

RGB

RGB, north-facing

Firmware & software

QMK

Yes

VIA

Yes

N-key rollover

Yes

Mac & Windows

Yes

Extras

Released

2024

2023

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 Max

Input Gear
ISO-DE
Out of stockShips to you
Keychron
ISO-DE, ISO-UK, ISO-Nordic, ISO-SW
Out of stockShips to you
Keychron (DE)
ISO-DE, ISO-UK, ISO-SW
In stockDoes not ship to you

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