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Head to head · Prices checked Nov 7, 2026

Double shell DoubleShell DS84i vs Yunzii C21

Get the Double shell DoubleShell DS84i for knob.

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Quick verdict

Which one should you get?

Get the

Double shell DoubleShell DS84i

Knob

Build quality in the bottom 5% of 75% boards under $100.

Rules this board out

  • Low-profile switches and keycaps only. Standard MX keycaps will not fit.
  • No numpad.
$99 at Mechkeys

Get the

Yunzii C21

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.

Double shell DoubleShell DS84i

Yunzii C21

  • Layout size

    75%

    Numpad

  • Low profile

    Yes

    No

  • Switch options

    Linear, Tactile

    Linear

  • Knob

    Yes

    No

  • Display

    None

    TFT

    A case display rather than a typing feature

KeebFinder scores

How we score
  • Double shell DoubleShell DS84i
  • Yunzii C21
Performance
62
70
Build quality
40
63
Productivity
58
58
Customizability
59
66
Portability
74
88

What they share

  • Connection: Bluetooth, 2.4 GHz, Wired
  • Hot-swappable
  • Keycaps: PBT
See every spec side by side

Full specs

Double shell DoubleShell DS84i vs Yunzii C21 specs

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

10 of 20 specs differ

Double shell DoubleShell DS84i

Yunzii C21

Typing & switches

Switch options

Linear, Tactile
Linear

Hot-swappable

Yes
Yes

Mount style

—
Gasket Mount

Low profile

Yes
No

Layout

Layout size

75%
Numpad

Layout standard

ANSI
—

Ergonomics

Standard
Standard

Knob

Yes
No

Display

None
TFT

Connectivity & battery

Connection

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

Max polling rate

—
1,000 Hz

Battery

—
2,500 mAh

USB-C

Yes
Yes

Build & materials

Keycaps

PBT
PBT

Weight

798 g
250 g

Dimensions

25 x 153 x 314 mm
39 x 153 x 98 mm

Backlight

RGB
RGB, south-facing

Firmware & software

N-key rollover

Yes
Yes

Mac & Windows

No
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.

Double shell DoubleShell DS84i2 stores
Yunzii C212 stores

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