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Compare Feker JJK21 vs Weikav Stars21 Programmable Numpad Differences Side by Side

This comparison is for users seeking a standalone mechanical numpad to complement a TKL or 60% keyboard. The decision is difficult because both offer gasket-mounted, hot-swappable PCBs and tri-mode connectivity, but they diverge sharply on core materials, firmware support, and portability. The Feker JJK21 is a more affordable plastic kit, while the Weikav Stars21 is a higher-end aluminum unit with specific programmable features.

76
FEKER JJK21 Numpad DIY Kit with Knob
80
[In Stock] Stars21 Programmable Mechanical Numpad

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2.8 (10)
0.0 (0)
  • Released in 2022
  • Comes with a knob
  • Connects via USB-C
  • Has built-in sound dampening
  • Equipped with a 1500 mAh battery
  • Weighs about 300 g
  • Made with a Plastic case
  • Released in 2025
  • Has Linear switch options
  • Supports QMK firmware
  • Supports VIA configuration
  • Runs at a 1000 Hz polling rate
  • Equipped with a 800 mAh battery
  • Weighs about 480 g
  • Sized at 18 x 130 x 95 mm
  • Made with a Aluminum case
Scores
  • Performance: 76.4
  • Build Quality: 75.2
  • Productivity: 73.2
  • Customizability: 80.2
  • Portability: 86.2
Scores
  • Performance: 75.7
  • Build Quality: 84.1
  • Productivity: 56.9
  • Customizability: 90
  • Portability: 78.1
Name
Feker JJK21
Name
Weikav Stars21 Programmable Numpad
Release year
2022
Release year
2025
Switch Options
-
Switch Options
Linear
Profile
Normal Profile
Profile
Normal Profile
Hot Swappable
 
Hot Swappable
 
Layout Size
Numpad
Layout Size
Numpad
Layout Standard
ANSI
Layout Standard
ANSI
Layout Ergonomics
Normal
Layout Ergonomics
Normal
Knob Support
 
Knob Support
 
Display Support
 
Display Support
 
Mac/Win Support
 
Mac/Win Support
 
Multi-Media Keys
 
Multi-Media Keys
 
USB-C
 
USB-C
 
USB passthrough
 
USB passthrough
 
Connection
Bluetooth, 2.4 GHz, Wired, Wireless
Connection
Bluetooth, 2.4 GHz, Wired, Wireless
Polling Rate
-
Polling Rate
1000 Hz
Battery capacity
1500 mAh
Battery capacity
800 mAh
Hall Effect Support
 
Hall Effect Support
 
QMK Support
 
QMK Support
 
VIA Support
 
VIA Support
 
VIAL Support
 
VIAL Support
 
N-Key Rollover
 
N-Key Rollover
 
Rapid Trigger
 
Rapid Trigger
 
Mount Style
Gasket Mount
Mount Style
Gasket Mount
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
Rgb
Backlight
 
Rgb
Case Colors
Case Colors
Case Material
Plastic
Case Material
Aluminum
Keycaps Material
-
Keycaps Material
-
Dimensions
-
Dimensions
18 x 130 x 95 mm
Weight
300g
Weight
480g
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Pros and Trade-offs

Select the Weikav Stars21 if your priority is a durable, aluminum-bodied numpad with the extensive customization offered by QMK and VIA firmware. Opt for the Feker JJK21 if you value a lighter, more portable kit with a larger battery, included knob, and pre-installed sound dampening at a likely lower cost. The core trade-off is between advanced programmability and practical, everyday features.

Feker JJK21

  • +Includes a programmable knob for media or application control.
  • +Larger 1500mAh battery for potentially longer wireless use.
  • +Lighter weight (300g) enhances portability.
  • +Comes with sound-dampening EVA and silicon foams pre-installed.
  • +Uses a PC (polycarbonate) mounting plate for a softer typing feel.
  • −Plastic case construction may feel less premium than aluminum.
  • −Uses proprietary configuration software, not QMK/VIA.
  • −Some user reviews note an automatic sleep mode in wireless modes that can cause a missed first keystroke.

Weikav Stars21 Programmable Numpad

  • +CNC aluminum case with anodized or electrophoretic finish for a premium build.
  • +Full support for QMK and VIA open-source firmware and remapping software.
  • +Explicitly lists a 1000Hz polling rate for wired and 2.4GHz modes.
  • +Features an anodized gold weight for added heft and stability.
  • +Offers a wider range of color options including Silver, Red, and Purple.
  • −Smaller 800mAh battery capacity.
  • −Substantially heavier at 480g, reducing portability.
  • −No mention of an included knob or dedicated media control.

Which Keyboard Is Better for Your Needs?

The Weikav Stars21 is the clear choice for programming and serious modding due to its QMK/VIA support. The Feker JJK21 wins for office use, travel, and content creation, thanks to its included knob, lighter weight, and larger battery. For gaming, the specs are closely matched, making it a tie. Your primary need for either advanced programmability or practical, portable features will dictate the winner.

GamingTie
  • •Both offer N-Key Rollover for simultaneous key presses.
  • •Both support a 2.4 GHz wireless mode for reduced latency.
  • •The Weikav lists a 1000Hz polling rate for its wired and 2.4GHz modes, a spec not explicitly stated for the Feker.
OfficeFeker JJK21
  • •The Feker JJK21 includes a dedicated knob for media control, a feature not mentioned for the Weikav.
  • •Its larger 1500mAh battery may offer longer wireless runtime.
  • •It is lighter at 300g, making it easier to reposition on a desk.
ProgrammingWeikav Stars21 Programmable Numpad
  • •The Weikav Stars21 explicitly supports QMK and VIA for deep, open-source key remapping and macro programming.
  • •The vendor description for the Feker mentions proprietary software, which may be more limiting.
  • •Its aluminum case may provide a more stable typing platform.
TravelFeker JJK21
  • •The Feker JJK21 is significantly lighter at 300g compared to the Weikav's 480g.
  • •It has a larger 1500mAh battery, which could require less frequent charging.
  • •Both are similar in footprint, but the weight difference is substantial.
ModdingWeikav Stars21 Programmable Numpad
  • •The Weikav Stars21 supports QMK/VIA, allowing for firmware-level customization beyond key mapping.
  • •It features a CNC aluminum case and an anodized gold weight for a premium base.
  • •Both are hot-swappable DIY kits, but the Weikav's open firmware is a major advantage for tinkerers.
Content CreationFeker JJK21
  • •The Feker JJK21's included knob can be programmed for timeline scrubbing or brush size adjustment.
  • •Its lighter weight allows for easy repositioning next to a graphics tablet.
  • •The vendor description notes it comes with sound-dampening EVA foam, which can reduce noise during recording.

Frequently Asked Questions (FAQ)

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