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Compare Coolkiller PolarBear vs Yunzii YZ21 Differences Side by Side

This comparison is for users seeking a dedicated mechanical numpad to complement a compact keyboard or laptop. The decision hinges on whether you prioritize a unique dual-function device with a premium typing feel or a more traditional numpad with flexible connectivity. Both are hot-swappable and offer distinct advantages, making the choice non-trivial for specific workflows.

62
CoolKiller PolarBear 2 in-1 Transparent Calculator & Number Pad Mechanical Keyboard
62
YUNZII YZ21 Macaron Hot Swappable Mechanical Numeric Keypad Num Pad

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  • Released in 2023
  • Has Linear switch options
  • Connects via USB-C
  • Has built-in sound dampening
  • Uses a Gasket Mount mounting style
  • Supports Wired, Wireless connectivity
  • Weighs about 296 g
  • Sized at 30 x 65 x 84 mm
  • Made with a Plastic case
  • Offers Yes, White RGB lighting
  • Released in 2022
  • Has Clicky, Tactile, Linear switch options
  • Supports Bluetooth, 2.4 GHz, Wired, Wireless connectivity
  • Offers Yes, Rgb, North-face, Rgb North-face RGB lighting
Scores
  • Performance: 59.2
  • Build Quality: 62
  • Productivity: 72
  • Customizability: 56
  • Portability: 87.3
Scores
  • Performance: 72
  • Build Quality: 52.9
  • Productivity: 57.2
  • Customizability: 69.6
  • Portability: 85.6
Name
Coolkiller PolarBear
Name
Yunzii YZ21
Release year
2023
Release year
2022
Switch Options
Linear
Switch Options
Clicky, Tactile, 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
Wired, Wireless
Connection
Bluetooth, 2.4 GHz, Wired, Wireless
Polling Rate
-
Polling Rate
-
Battery capacity
1500 mAh
Battery capacity
1500 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
-
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
White
Backlight
 
Rgb, North-face
Case Colors
Case Colors
Case Material
Plastic
Case Material
-
Keycaps Material
PBT
Keycaps Material
PBT
Dimensions
30 x 65 x 84 mm
Dimensions
-
Weight
296g
Weight
-
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Pros and Trade-offs

Your primary need dictates the choice. If you value a unique, premium typing experience with a clever calculator function and don't need wireless, the Coolkiller PolarBear is the clear pick. If your priority is flexible wireless connectivity to multiple devices, software-based RGB/macro control, and a lower cost, the Yunzii YZ21 is the better option. Both are competent hot-swappable numpads that serve different niches effectively.

Coolkiller PolarBear

  • +Unique 2-in-1 functionality as a wired numpad and a standalone mechanical calculator.
  • +Gasket mount design with silicone dampening for a softer, cleaner typing feel.
  • +Includes a coiled USB-C cable and a 2-in-1 switch/keycap puller.
  • +Transparent keycaps and case with white LED backlighting for a distinct aesthetic.
  • +Pre-lubricated Ice Blade linear switches are included.
  • −Connectivity is wired-only, lacking Bluetooth or 2.4 GHz wireless options.
  • −Only available with linear switches, offering no stock tactile or clicky variants.
  • −The specific keycap profile is not detailed, which may affect typing feel for some.

Yunzii YZ21

  • +Tri-mode connectivity with Bluetooth, 2.4 GHz wireless, and wired USB-C.
  • +Custom software allows for programmable RGB lighting effects and macro settings.
  • +Available with a choice of five different Gateron G Pro switch types.
  • +Uses dye-sublimated PBT keycaps in XDA profile for durability and a uniform look.
  • +Generally more affordable than the Coolkiller PolarBear.
  • −Lacks a gasket mount or any specifically mentioned sound-dampening construction.
  • −The vendor description does not mention included accessories like a puller or special cable.
  • −No dual-function capability like a standalone calculator.

Which Keyboard Is Better for Your Needs?

The Yunzii YZ21 takes the lead for gaming and travel due to its wireless versatility and macro programmability. The Coolkiller PolarBear is favored for programming and content creation, where its gasket-mounted feel and unique calculator function shine. For office use, it's a tie, with each offering compelling but different productivity features. Modders will find more software-driven customization options with the YZ21.

GamingYunzii YZ21
  • •The Yunzii YZ21 offers a 2.4 GHz wireless connection, which is often preferred for a clutter-free gaming setup.
  • •It provides a choice of switch types, including linear options suitable for gaming.
  • •Its vendor description mentions programmable macro functionality, which can be useful for game shortcuts.
OfficeTie
  • •Both offer full N-key rollover and compatibility with Windows and Mac.
  • •The PolarBear's standalone calculator function is highly practical for financial or data entry tasks.
  • •The YZ21's tri-mode wireless (Bluetooth, 2.4G, wired) offers more flexibility for connecting to multiple office devices.
ProgrammingCoolkiller PolarBear
  • •The Coolkiller PolarBear's gasket mount design, with silicone dampening, may provide a softer, quieter typing experience for long sessions.
  • •Its transparent design with white LED backlighting offers clear key legends in low light.
  • •The included coiled USB-C cable and switch puller add value for a ready-to-use setup.
TravelYunzii YZ21
  • •The Yunzii YZ21 supports Bluetooth connectivity, allowing use with tablets or phones without a cable.
  • •Its vendor page lists a lighter, more compact 'Macaron' colorway design.
  • •The 1500mAh battery supports its wireless functions for portable use.
ModdingYunzii YZ21
  • •The Yunzii YZ21's vendor description explicitly mentions custom software for RGB effects and macro setting.
  • •It supports a wider variety of stock switch choices (Gateron G Pro Red, Blue, Yellow, Brown, Black).
  • •It uses dye-sublimation PBT keycaps, which are durable and resistant to fading.
Content CreationCoolkiller PolarBear
  • •The Coolkiller PolarBear's unique transparent aesthetic with crystal-like white LED lighting is visually distinctive for streaming setups.
  • •The gasket-mounted construction aims for a cleaner, more pleasant acoustic signature for audio-sensitive environments.
  • •Its dual role as a calculator can be useful for quick calculations in spreadsheet or finance-related content.

Frequently Asked Questions (FAQ)

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