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Head to head · Prices checked Nov 10, 2026

Firstblood B6 vs Yunzii C21

Get the Yunzii C21 for hot-swappable and the 2,500 mAh battery.

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Quick verdict

Which one should you get?

Get the

Firstblood B6

Rules this board out

  • Switches are soldered. Swapping them means soldering.
  • Macropad only. This is not a full keyboard.
$38 at WhatGeek

Get the

Yunzii C21

Hot-swappable

Build quality in the bottom 50% of Numpad boards under $100.

Rules this board out

  • South-facing LEDs. Shine-through legends stay dark, and some sculpted keycaps can clip the LED.
  • Numpad only. This is not a full keyboard.
$54 at Yunzii

What actually differs

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.

Firstblood B6

Yunzii C21

  • Layout size

    Macropad

    Numpad

  • Hot-swappable

    No

    Yes

    Switch changes without soldering

  • Battery

    600 mAh

    2,500 mAh

    A larger battery means fewer cables during the day

  • Switch options

    Tactile

    Linear

  • Display

    None

    TFT

    A case display rather than a typing feature

KeebFinder scores

How we score
  • Firstblood B6
  • Yunzii C21
Performance
47
69
Build quality
44
62
Productivity
63
58
Customizability
43
66
Portability
86
88

What they share

  • Connection: Bluetooth, 2.4 GHz, Wired
See every spec side by side

Full specs

Firstblood B6 vs Yunzii C21 specs

Every tracked spec, side by side. Rows marked with a dot differ between the boards.

11 of 19 specs differ

Firstblood B6

Yunzii C21

Typing & switches

Switch options

Tactile
Linear

Hot-swappable

No
Yes

Mount style

—
Gasket Mount

Layout

Layout size

Macropad
Numpad

Layout standard

ANSI
—

Ergonomics

Standard
Standard

Display

None
TFT

Connectivity & battery

Connection

Bluetooth, 2.4 GHz, Wired
Bluetooth, 2.4 GHz, Wired

Max polling rate

—
1,000 Hz

Battery

600 mAh
2,500 mAhBetter

USB-C

Yes
Yes

Build & materials

Case material

Acrylic
—

Keycaps

PC
PBT

Weight

296 g
250 g

Dimensions

30 x 65 x 84 mm
39 x 153 x 98 mm

Backlight

None
RGB, south-facing

Firmware & software

N-key rollover

No
Yes

Mac & Windows

Yes
Yes

Extras

Released

2023
2026

Where to buy

Compare prices

Live prices from the stores we track, cheapest in-stock offer first.

Prices in USD are converted to your currency and can change at any time. KeebFinder may earn a commission when you buy through these links, at no extra cost to you.

Firstblood B62 stores
Yunzii C212 stores

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