Compare Feker JJK21 vs Leobog K21 Differences Side by Side

This comparison is for users seeking a compact, wireless numpad to complement a tenkeyless or smaller keyboard. The decision is challenging because both the Feker JJK21 and Leobog K21 offer triple-mode connectivity and hot-swap sockets at a similar price point. The core trade-off is between the Feker's advanced gasket-mount construction and DIY kit format versus the Leobog's pre-built convenience and lighter weight. Your preference for building a project versus using a finished product will be the deciding factor.

Model
	76	68	Select a keyboard to compare
Rating	2.8 stars (10 reviews)	0.0 stars (0 reviews)
Purchase Options
Main differences	Comes with a knob Uses a Gasket Mount mounting style Equipped with a 1500 mAh battery Weighs about 300 g Offers Yes, Rgb RGB lighting	Compatible with both Mac and Windows Uses a Plate Mount mounting style Equipped with a 600 mAh battery Weighs about 200 g Sized at 37 x 82 x 120 mm Features PBT, ABS keycaps Offers Yes, Rgb, White RGB lighting
Score	Scores Performance: 76.4 Build Quality: 75.2 Productivity: 73.2 Customizability: 80.2 Portability: 86.2	Scores Performance: 72.2 Build Quality: 58.9 Productivity: 79.3 Customizability: 69.8 Portability: 88.6
Name	Name Feker JJK21	Name Leobog K21
Release year	Release year 2022	Release year 2022
Switch Options	Switch Options -	Switch Options -
Profile	Profile Normal Profile	Profile Normal Profile
Hot Swappable	Hot Swappable	Hot Swappable
Layout Size	Layout Size Numpad	Layout Size Numpad
Layout Standard	Layout Standard ANSI	Layout Standard ANSI
Layout Ergonomics	Layout Ergonomics Normal	Layout Ergonomics Normal
Knob Support	Knob Support	Knob Support
Display Support	Display Support	Display Support
Mac/Win Support	Mac/Win Support	Mac/Win Support
Multi-Media Keys	Multi-Media Keys	Multi-Media Keys
USB-C	USB-C	USB-C
USB passthrough	USB passthrough	USB passthrough
Connection	Connection Bluetooth, 2.4 GHz, Wired, Wireless	Connection Bluetooth, 2.4 GHz, Wired, Wireless
Polling Rate	Polling Rate -	Polling Rate -
Battery capacity	Battery capacity 1500 mAh	Battery capacity 600 mAh
Hall Effect Support	Hall Effect Support	Hall Effect Support
QMK Support	QMK Support	QMK Support
VIA Support	VIA Support	VIA Support
VIAL Support	VIAL Support	VIAL Support
N-Key Rollover	N-Key Rollover	N-Key Rollover
Rapid Trigger	Rapid Trigger	Rapid Trigger
Mount Style	Mount Style Gasket Mount	Mount Style Plate Mount
Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers
Sound Dampening	Sound Dampening	Sound Dampening
Backlight	Backlight Rgb	Backlight Rgb, White
Case Colors	Case Colors	Case Colors
Case Material	Case Material Plastic	Case Material Plastic
Keycaps Material	Keycaps Material -	Keycaps Material PBT, ABS
Dimensions	Dimensions -	Dimensions 37 x 82 x 120 mm
Weight	Weight 300g	Weight 200g

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Pros and Trade-offs

Select the Feker JJK21 if you enjoy building keyboards and want a premium gasket-mount typing feel with a programmable knob for macros or media. Opt for the Leobog K21 if you prefer a lighter, pre-built numpad that works immediately and has explicit cross-platform support. Both are capable wireless peripherals, but they cater to different user engagement levels.

Feker JJK21

+Gasket mount design with a PC plate for a softer, bouncier typing feel.
+Sold as a complete DIY kit including case, PCB, foam, stabilizers, plate, and battery.
+Includes a programmable knob for media control or custom functions.
+Larger 1500mAh battery capacity for longer wireless use.
+Comes with both silicon and EVA foam layers for sound dampening.

−Requires assembly, as it is a DIY kit, not a pre-built product.
−Heavier at 300g, which may reduce portability.
−Some user reviews note an automatic sleep mode in wireless modes that can cause a missed first keystroke.

Leobog K21

+Pre-built and ready to use out of the box.
+Lighter weight of 200g for easier portability.
+Includes PBT and ABS keycaps and comes with pre-lubed Leobog Crystal switches.
+Explicitly lists Mac and Windows support in its features.

−Smaller 600mAh battery capacity.
−Uses a standard plate mount instead of a gasket mount.
−Lacks a knob for additional control or programmability.

Which Keyboard Is Better for Your Needs?

The Leobog K21 wins for office use and travel due to its pre-built nature and lighter weight. The Feker JJK21 is the clear choice for modding, programming, and content creation, thanks to its DIY kit format, programmable knob, and macro software. For gaming, both are equally capable on paper. The choice largely depends on whether you value a project (Feker) or a plug-and-play accessory (Leobog).

GamingTie

•Both offer N-key rollover for simultaneous key presses.
•Both support low-latency 2.4GHz wireless and wired modes.
•Neither has a stated advantage in polling rate or gaming-specific features.

OfficeLeobog K21

•The Leobog K21 is a pre-built unit, ready to use out of the box.
•Its listing includes explicit Mac/Win support.
•It is lighter at 200g, making it slightly easier to reposition on a desk.

ProgrammingFeker JJK21

•The Feker JJK21's software is noted by users for programming macros and shortcuts.
•The inclusion of a knob can be programmed for media control or scrolling, aiding workflow.
•The gasket mount may provide a more comfortable typing feel for long sessions.

TravelLeobog K21

•The Leobog K21 is significantly lighter at 200g versus 300g.
•Its listed dimensions (37 x 82 x 120 mm) suggest a compact form factor.
•Both have similar wireless functionality, but lower weight is better for portability.

ModdingFeker JJK21

•The Feker JJK21 is sold as a DIY kit, designed for assembly and customization.
•It features a gasket mount and a PC (polycarbonate) plate for a specific typing feel.
•The kit includes EVA foam and silicon foams for sound dampening, providing a modding foundation.

Content CreationFeker JJK21

•The Feker's programmable knob is directly useful for timeline scrubbing or parameter adjustment.
•User reviews confirm the ability to set macros via software.
•The larger 1500mAh battery may require less frequent charging during long work sessions.