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GravaStar Mercury K1 vs YUNZII B75 PRO

Researched, not hands-on tested.How we review ›

all judged against mechanical keyboards at a similar price

The YUNZII B75 PRO scores 6.7/10 overall, ahead of the GravaStar Mercury K1 at 6.5/10.

The GravaStar Mercury K1 leads on build quality.

The YUNZII B75 PRO leads on typing feel and layout and ergonomics.

They score the same on customisation, connectivity and battery and software.

GravaStar Mercury K1

GravaStar Mercury K1

6.5/10verdict: buy

The GravaStar Mercury K1 is for people who want a compact 75% wireless keyboard with an aluminium frame. It suits buyers who value a muted, cushioned sound and want to swap switches later. It is less suited to anyone who needs a specific regional layout or confirmed remapping tools.

Typically about £129 in the UK when we researched itCheck price at Amazon UK (opens in a new tab, affiliate link)

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

YUNZII B75 PRO

YUNZII B75 PRO

6.7/10verdict: buy

The YUNZII B75 PRO is for UK typists who want a compact, wireless 75% keyboard with an ISO layout and a knob. It suits people who care about typing sound and feel and who like the option of swapping switches later. It's less suited to anyone who wants open firmware such as QMK or VIA.

Typically about £66.29 in the UK when we researched itCheck price at Amazon UK (opens in a new tab, affiliate link)

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

Scores, criterion by criterion

CriterionWeightGravaStar Mercury K1YUNZII B75 PRO
Typing feel25%7/108/10
Build quality20%8/107/10
Customisation20%5/105/10
Connectivity15%7/107/10
Layout and ergonomics10%5/106/10
Battery and software10%6/106/10
Overall6.5/106.7/10

Specifications

SpecGravaStar Mercury K1YUNZII B75 PRO
Layout75%, 79 keys plus rotary knob75% with knob, 83-key ISO (ANSI variant 82-key)
SwitchesGravaStar Custom Linear, 40gf actuation, 1.5mm pre-travel, 3.5mm total travelVaries by variant: YUNZII Milk Linear, Cocoa Cream V2 Linear, or Blue Grey Tactile; pre-lubed
Hot-swappableYes, 3-pin and 5-pin compatibleFull-key hot-swappable, supports 3-pin or 5-pin switches
ConnectivityTri-mode: Bluetooth 5.0, 2.4GHz wireless and USB-C wiredBluetooth, 2.4GHz wireless, and wired Type-C
Firmware (QMK / VIA)not listedYUNZII software for key remapping, macros and RGB; Windows and macOS per manufacturer, Windows-only per Vivid Repairs review. No QMK/VIA support found
KeycapsPBT and PCDouble-shot PBT Cherry profile
Battery8000mAh4000mAh

Strengths and weaknesses

GravaStar Mercury K1

  • + Aluminium alloy frame praised as solid and heavy
  • + Gasket mount with foam gives muted, cushioned typing
  • + Hot-swap sockets take 3-pin and 5-pin switches
  • − Volume roller is plastic styled to look like metal
  • − Front logo placement does not blend in
  • − Backplate is plastic beneath the aluminium frame

Skip it if:

  • Buyers who need a full numpad
  • Anyone who wants a loud, sharp typing sound
  • Buyers who want metal controls throughout
Read the full GravaStar Mercury K1 review ›

YUNZII B75 PRO

  • + Gasket mount with pre-lubed switches and tuned stabilisers
  • + Owners praise the typing sound and battery life
  • + ISO layout with Bluetooth, 2.4GHz and wired modes
  • − No QMK or VIA support; remapping uses YUNZII software
  • − One review reports the software is Windows-only
  • − Switch type depends on which variant you buy

Skip it if:

  • Buyers who want QMK or VIA open firmware for remapping
  • Buyers who depend on the remapping software working on their operating system
  • Anyone who wants a tactile switch without checking the variant first
Read the full YUNZII B75 PRO review ›

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