Epomaker EK21 vs Feker JJK21VIA vs DIY Kit
Choose the prebuilt Epomaker EK21 for VIA programming and included linear switches, or the Feker JJK21 if you want a barebones kit with a larger battery.
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4.6 (36)4.6 · 36 reviews
from$33at Epomaker
90-day lowLowest price in 90 days
2.8 (10)2.8 · 10 reviews
from$39at WhatGeek
90-day lowLowest price in 90 days
Which one should you get?
Get the
Epomaker EK21
VIA
Build quality in the top 25% of Numpad boards under $50.
- Prebuilt with linear switches and PBT keycaps.
- VIA support for key programming.
- Polycarbonate plate and gasket mount, with the vendor describing three layers of PORON and IXPE dampening.
Get the
Feker JJK21
DIY Kit
Build quality in the top 25% of Numpad boards under $50.
- DIY kit package includes a case, PCB, EVA foam, stabilizers, positioning plate, and battery.
- Hot-swappable PCB supports 3-pin and 5-pin switches.
- Gasket mount and vendor-described PC mounting plate.
For a ready-to-use numpad with VIA support, linear switches, and a lighter listed weight, choose the Epomaker EK21. Pick the Feker JJK21 if you specifically want to build around a barebones kit and value its 1500mAh battery. Both provide a knob, hot-swap support, RGB, and tri-mode connectivity.
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
Feker JJK21
Battery
1,000 mAh
1,500 mAh
A larger battery means fewer cables during the day
Case material
ABS
Plastic
Weight
200 g
300 g
Heavier boards stay planted and lighter ones travel
VIA
Yes
No
GUI remapping without compiling firmware
Plate material
Polycarbonate
Plastic
- Epomaker EK21
- Feker JJK21
- Performance
- 7776
- Build quality
- 7674
- Productivity
- 8774
- Customizability
- 8280
- Portability
- 8886
- Layout size: Numpad
- Connection: Bluetooth, 2.4 GHz, Wired
- Hot-swappable
- Mount style: Gasket Mount
- Knob
- Sound dampening
What will you mostly use it for?
The EK21 has an edge for office workflows, programming, travel, and content creation, largely because it is prebuilt, supports VIA, and weighs less. Its listed polling rate also gives it the clearer case for gaming, though both share N-Key Rollover and multiple connection modes. The JJK21 is the more suitable starting point for hands-on assembly, since it is sold as a DIY kit. Both have a knob, RGB, gasket mounting, and hot-swap support.
Pick the Epomaker EK21
- The EK21 lists a 1000 Hz polling rate, while the JJK21 has no polling rate specified.
- Both list N-Key Rollover and Bluetooth, 2.4 GHz, and wired connectivity.
What owners say
Ratings and quotes collected from verified store reviews, including the critical ones.
Epomaker EK21
36 owner reviews
“Great wireless connectivity, sounds and feels as good as my 200$ custom keyboard. Great buy especially with the discount, would definitely buy again.”
“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…”
Feker JJK21
10 owner reviews
“This numpad has been one of my favorite recent purchases. The wireless is very snappy and painless to pair. I use it to pull out when I need to enter a lot of numbers for work but then put it away for playing games. Its a great little addition and it even has…”
“キーを打つ度にドンドンと机を叩くような低い音が響くので、柔らかいリストレストの上に置いて使っています。 ライティングの設定は、しばらく続けるとなぜか変更を受け付けなくなるので、その度にリセット(多分Fn+Esc長押し)を押しています。 Windowsを起動した直後にpinを入れるためにキーを押しても反応が鈍く、入力をやり直す機会が増えたことも不満です。 追記 接続は、PC側もUSB-Cで繋ぐと安定しました。 ライティングを点滅させるとNumランプも一緒に点滅するので視認性が悪いです。…”
Epomaker EK21 vs Feker JJK21 specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
7 of 23 specs differ
Epomaker EK21
Feker JJK21
Switch options
Hot-swappable
Mount style
Sound dampening
Layout size
Layout standard
Ergonomics
Knob
Display
Connection
Max polling rate
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Dimensions
Backlight
VIA
N-key rollover
Mac & Windows
Released
Compare prices
Live prices from the stores we track, cheapest in-stock offer first.
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Lowest price across stores, Amazon excluded.
Epomaker EK21 vs Feker JJK21: your questions
The EK21 is listed as a prebuilt numpad with linear switches and VIA support. The JJK21 is sold as a DIY kit with a case, PCB, foam, stabilizers, and positioning plate.
Yes, the EK21 lists VIA support, and the vendor describes its keys as programmable through VIA. The JJK21 vendor description instead refers to Feker software.
The JJK21 is described as a customized kit containing a case, PCB, foam, stabilizers, positioning plate, and battery. Its package contents do not list switches or keycaps.
The Epomaker EK21 is listed at 200 g, while the Feker JJK21 is listed at 300 g. The EK21 is the lighter option by those listed weights.
The EK21 has a listed 1000mAh battery, and the JJK21 has a listed 1500mAh battery. Capacity alone does not establish how long either numpad will run between charges.
Both list Bluetooth and 2.4 GHz connectivity, as well as wired USB-C or Type-C connections. The vendor descriptions also call these tri-mode connection options.
The EK21 has a listed 1000 Hz polling rate and N-Key Rollover. The JJK21 also lists full-key anti-ghosting, but its polling rate is not specified here.
Both are hot-swappable and their descriptions specify support for 3-pin and 5-pin mechanical switches. The EK21 is listed with linear switches, while the JJK21 is sold as a DIY kit.
The EK21 supports VIA, with the vendor describing programmable keys and macros. The JJK21 vendor says it supports software programmability, but identifies Feker software rather than VIA.
The EK21 metadata lists an ABS case, polycarbonate plate, and PBT keycaps. The JJK21 metadata lists a plastic case and plastic plate, and its vendor describes a PC mounting plate.
Yes, both are listed as gasket mount. The EK21 vendor also describes a flex-cut PC plate and three layers of PORON and IXPE dampening, while the JJK21 vendor describes silicon foams.
Both list a knob and RGB. The EK21 vendor describes its knob as an aluminum alloy control for volume, while the JJK21 vendor describes its knob as convenient for media control.
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