Epomaker EK21 vs Keychron J4
Get the Epomaker EK21 for knob. Get the Keychron J4 for the 4,000 mAh battery.
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4.6 (36)4.6 · 36 reviews
from$33at Epomaker
90-day lowLowest price in 90 days
No reviews
from$59at Keychron
Which one should you get?
Get the
Epomaker EK21
Knob
Build quality in the top 25% of Numpad boards under $50.
- Numpad only. This is not a full keyboard.
Get the
Keychron J4
Battery
Build quality in the top 30% of 80% boards under $100.
- North-facing LEDs. Cherry-profile keycaps can hit the switch housing.
- No numpad.
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
Keychron J4
Layout size
Numpad
80%
Battery
1,000 mAh
4,000 mAh
A larger battery means fewer cables during the day
Switch options
Linear, Silent
Clicky, Linear, Tactile
Knob
Yes
No
Weight
200 g
870 g
Heavier boards stay planted and lighter ones travel
- Epomaker EK21
- Keychron J4
- Performance
- 7782
- Build quality
- 7671
- Productivity
- 8789
- Customizability
- 8289
- Portability
- 8873
- Connection: Bluetooth, 2.4 GHz, Wired
- Hot-swappable
- Max polling rate: 1,000 Hz
- Case material: ABS
- VIA
- Sound dampening
Epomaker EK21 vs Keychron J4 specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
10 of 26 specs differ
Epomaker EK21
Keychron J4
Switch options
Hot-swappable
Mount style
Sound dampening
Layout size
Layout standard
Ergonomics
Knob
Display
Media keys
Connection
Max polling rate
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Dimensions
Typing angle
Backlight
QMK
VIA
N-key rollover
Mac & Windows
Released
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