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Compare GravaStar Mercury K1 vs WOBKEY Rainy75 Pro Differences Side by Side

This comparison is for buyers deciding between two similarly priced 75% wireless aluminum keyboards. The choice is difficult because both offer gasket mounts, hot-swap sockets, and tri-mode connectivity. The decision hinges on whether you prioritize a lighter, longer-lasting travel companion or a heavier, more customizable typing experience with advanced software.

66
GravaStar Mercury K1 Wireless Mechanical Keyboard
94
WOBKEY Rainy 75 Pro Keyboard

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0.0 (0)
5.0 (34)
  • Released in 2024
  • Built with the ANSI layout standard
  • Equipped with a 8000 mAh battery
  • Weighs about 1080 g
  • Sized at 46 x 343 x 156 mm
  • Made with a Aluminum case
  • Offers Yes, Rgb RGB lighting
  • Released in 2025
  • Built with the ANSI, ISO-DE, ISO layout standard
  • Supports QMK firmware
  • Supports VIA configuration
  • Features N-key rollover
  • Includes screw-in stabilizers
  • Has built-in sound dampening
  • Runs at a 1000 Hz polling rate
  • Equipped with a 7000 mAh battery
  • Weighs about 1800 g
  • Sized at 30 x 320 x 150 mm
  • Made with a Aluminum, Steel case
  • Features PBT keycaps
  • Offers Yes, Rgb, South-face, Rgb South-face RGB lighting
Scores
  • Performance: 66.2
  • Build Quality: 67.4
  • Productivity: 66.5
  • Customizability: 63.9
  • Portability: 92.3
Scores
  • Performance: 79.9
  • Build Quality: 88
  • Productivity: 93.9
  • Customizability: 89.6
  • Portability: 91.7
Name
GravaStar Mercury K1
Name
WOBKEY Rainy75 Pro
Release year
2024
Release year
2025
Switch Options
Linear
Switch Options
Linear
Profile
Normal Profile
Profile
Normal Profile
Hot Swappable
 
Hot Swappable
 
Layout Size
75%
Layout Size
75%
Layout Standard
ANSI
Layout Standard
ANSI, ISO-DE, ISO
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
Bluetooth, 2.4 GHz, Wired, Wireless
Connection
Bluetooth, 2.4 GHz, Wired, Wireless
Polling Rate
-
Polling Rate
1000 Hz
Battery capacity
8000 mAh
Battery capacity
7000 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
Gasket Mount
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
Rgb
Backlight
 
Rgb, South-face
Case Colors
Case Colors
Case Material
Aluminum
Case Material
Aluminum, Steel
Keycaps Material
-
Keycaps Material
PBT
Dimensions
46 x 343 x 156 mm
Dimensions
30 x 320 x 150 mm
Weight
1080g
Weight
1800g
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Pros and Trade-offs

Your priority should guide this choice. For a keyboard you'll move frequently or use wirelessly for long stretches, the GravaStar Mercury K1's lighter build and larger battery are compelling. If you value deep customization, a premium typing feel, and advanced software features right out of the box, the WOBKEY Rainy75 Pro's extensive spec sheet makes it the more versatile and future-proof investment.

GravaStar Mercury K1

  • +Lighter weight of 1080g for better portability.
  • +Larger 8000mAh battery capacity for extended wireless use.
  • +Aluminum alloy case with a distinctive, streamlined aesthetic according to its vendor page.
  • +Hot-swappable sockets support 3-pin and 5-pin switches.
  • −Lacks explicitly stated support for VIA, QMK, or detailed programmability features.
  • −Switch type is pre-selected as Linear (Kailh), with no mention of other included options.
  • −Does not list specific sound-dampening materials or PBT keycaps in its core specifications.

WOBKEY Rainy75 Pro

  • +Explicit support for VIA and QMK firmware for extensive customization.
  • +Includes multiple sound-dampening layers: poron, EPMD, and PET insulation sheet.
  • +Comes with double-shot PBT keycaps and screw-in stabilizers.
  • +Features a flex-cut FR4 plate and PCB, and south-facing RGB LEDs.
  • −Heavier at 1800g, which reduces portability.
  • −Smaller 7000mAh battery compared to the Mercury K1.
  • −The steel external weight, while premium, contributes significantly to its mass.

Which Keyboard Is Better for Your Needs?

The WOBKEY Rainy75 Pro is the more capable all-rounder, winning in gaming, programming, modding, and content creation due to its specified polling rate, extensive firmware support, and sound-optimized construction. The GravaStar Mercury K1 claims a clear advantage only for travel, thanks to its substantially lower weight and larger battery. For office use, both keyboards are equally competent with their wireless options and system compatibility.

GamingWOBKEY Rainy75 Pro
  • •The Rainy75 Pro lists a 1000 Hz polling rate, which the Mercury K1's specifications do not mention.
  • •It features N-Key Rollover, ensuring all pressed keys are registered simultaneously.
  • •South-facing RGB LEDs, as listed, prevent interference with Cherry-profile keycaps.
OfficeTie
  • •Both support Bluetooth, 2.4 GHz, and wired connectivity for flexible device switching.
  • •Both are listed with Mac and Windows support.
  • •The Mercury K1 has a larger 8000mAh battery for longer wireless use, while the Rainy75 Pro offers programmable keys via VIA for workflow automation.
ProgrammingWOBKEY Rainy75 Pro
  • •The Rainy75 Pro supports VIA and QMK for deep, easy key remapping and macro creation.
  • •It includes PBT keycaps, which are more resistant to shine from frequent use.
  • •Its layout supports multiple ISO standards (ISO-DE, ISO), offering more keycap compatibility for international users.
TravelGravaStar Mercury K1
  • •The GravaStar Mercury K1 is significantly lighter at 1080g compared to the Rainy75 Pro's 1800g.
  • •Its larger 8000mAh battery promises longer use between charges.
  • •It has a more compact profile in one dimension at 46mm height versus the Rainy75 Pro's 30mm, but its overall form factor is similar.
ModdingWOBKEY Rainy75 Pro
  • •The Rainy75 Pro explicitly lists VIA and QMK support for firmware customization.
  • •Its build includes multiple sound-dampening layers (poron, EPMD, PET sheet) and screw-in stabilizers.
  • •It features a flex-cut FR4 plate and a 1.2mm flex-cut PCB, offering a more tailored typing feel.
Content CreationWOBKEY Rainy75 Pro
  • •Programmable keys via VIA/QMK on the Rainy75 Pro are advantageous for shortcuts in editing software.
  • •South-facing RGB, as stated, provides better compatibility with a wider range of aftermarket keycaps for aesthetic customization.
  • •The included PBT keycaps offer a more durable typing surface for long sessions.

Frequently Asked Questions (FAQ)

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