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Compare Haverworks Theseus75 vs Sirius Ursa Major V2 Differences Side by Side

This comparison is for enthusiasts deciding between two high-end, split 75% mechanical keyboard kits. The choice is difficult because both offer hot-swappable PCBs, QMK/VIA support, and premium aluminum construction, but diverge sharply on connectivity and included features. The Haverworks Theseus75 is a wired-only kit with a unique USB passthrough hub, while the Sirius Ursa Major V2 provides wireless Bluetooth connectivity and is listed as in-stock.

91
[Group-Buy] Haverworks Theseus75 - Barebones Kit
87
[In Stock] Ursa Major V2 Wireless Aluminum Ultimate Keyboard

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  • Released in 2024
  • Offers a USB passthrough port
  • Uses a Gasket Mount mounting style
  • Supports Wired, Wired only connectivity
  • Weighs about 2923 g
  • Made with a Aluminum, Polycarbonate case
  • Offers Yes, Rgb RGB lighting
  • Released in 2025
  • Compatible with both Mac and Windows
  • Features N-key rollover
  • Includes screw-in stabilizers
  • Supports Bluetooth, Wired, Wireless connectivity
  • Runs at a 1000 Hz polling rate
  • Equipped with a 2400 mAh battery
  • Weighs about 1400 g
  • Sized at 14 x 36 x 4 mm
  • Made with a Aluminum case
  • Offers No RGB lighting
Scores
  • Performance: 80.3
  • Build Quality: 85.8
  • Productivity: 90.5
  • Customizability: 94.5
  • Portability: 78.3
Scores
  • Performance: 67.3
  • Build Quality: 81.9
  • Productivity: 97.3
  • Customizability: 92.1
  • Portability: 90.2
Name
Haverworks Theseus75
Name
Sirius Ursa Major V2
Release year
2024
Release year
2025
Switch Options
-
Switch Options
-
Profile
Normal Profile
Profile
Normal Profile
Hot Swappable
 
Hot Swappable
 
Layout Size
Other
Layout Size
Other
Layout Standard
ANSI
Layout Standard
ANSI
Layout Ergonomics
Split
Layout Ergonomics
Split
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, Wired only
Connection
Bluetooth, Wired, Wireless
Polling Rate
-
Polling Rate
1000 Hz
Battery capacity
-
Battery capacity
2400 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
 
Rgb
Backlight
 
Case Colors
Case Colors
Case Material
Aluminum, Polycarbonate
Case Material
Aluminum
Keycaps Material
-
Keycaps Material
-
Dimensions
-
Dimensions
14 x 36 x 4 mm
Weight
2923g
Weight
1400g
*Something incorrect or missing? Please
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Pros and Trade-offs

Your primary need dictates the choice. For a clean, cable-free desk with multi-device flexibility, the in-stock Sirius Ursa Major V2 is the practical pick. If your workstation is a permanent command center where you value direct peripheral connectivity, extensive sound tuning, and a premium unboxing experience, the Haverworks Theseus75 is worth the wait, despite its group-buy status.

Haverworks Theseus75

  • +Includes an integrated USB 2.0 hub with passthrough for peripherals.
  • +Offers a choice of six different plate materials (FR4, Aluminum, Brass, PC, POM, Carbon Fiber).
  • +Features a sophisticated hybrid gasket and grommet mount system with PORON foam.
  • +Comes with two programmable rotary encoders.
  • +Kit includes a comprehensive accessory set and a custom carrying case.
  • −Wired-only connectivity requires both a host cable and an interconnect cable.
  • −Very heavy at 2.9kg, limiting portability.
  • −Is a group-buy product with an estimated future shipping date, not immediately available.

Sirius Ursa Major V2

  • +Offers dual-mode Bluetooth and wired connectivity.
  • +Listed as in-stock and ready to ship from the vendor.
  • +Lighter weight (1.4kg) and potentially more portable footprint.
  • +Includes a 2400mAh battery with a manufacturer-claimed six-month life.
  • +Features a dedicated Windows/Mac app (LNE Link+) for key remapping without firmware flashing.
  • −Lacks RGB lighting of any kind.
  • −Only includes an FR4 plate, with no other material options mentioned.
  • −The vendor description does not detail the same level of acoustic dampening foams or mounting customization as the Theseus75.

Which Keyboard Is Better for Your Needs?

The Ursa Major V2 is the clear choice for mobile professionals and office users who prioritize wireless connectivity and a lighter build. The Theseus75 dominates for stationary, feature-focused setups like gaming battlestations and content creation desks, thanks to its USB hub and superior modding potential. For programming, both are equally capable due to their shared firmware support and split layouts.

GamingHaverworks Theseus75
  • •The Theseus75's wired-only connection ensures consistent latency, as no polling rate is specified for the Ursa Major V2's wireless mode.
  • •Its integrated USB hub allows direct connection of a gaming mouse or other peripherals.
  • •The vendor description mentions a cushioned typing feel from its gasket and grommet mount, which may aid comfort during long sessions.
OfficeSirius Ursa Major V2
  • •The Ursa Major V2 offers Bluetooth connectivity for easy switching between multiple devices.
  • •Its listed 2400mAh battery and claimed six-month battery life reduce cable clutter.
  • •The manufacturer states it supports cross-hand key combinations and layer switching, which can improve workflow efficiency.
ProgrammingTie
  • •Both keyboards support QMK and VIA for deep, on-the-fly key remapping and macro programming.
  • •Both are split 75% layouts, conserving desk space while retaining a column of macro/navigation keys.
  • •The Theseus75 includes two rotary encoders for additional programmable controls.
TravelSirius Ursa Major V2
  • •The Ursa Major V2 is significantly lighter at 1400g compared to the Theseus75's 2923g.
  • •Wireless operation eliminates the need to manage an interconnect cable and a host USB cable.
  • •Its smaller listed dimensions (14 x 36 x 4 mm per side) may make it slightly more portable.
ModdingHaverworks Theseus75
  • •The Theseus75 kit includes six different plate material options (FR4, Aluminum, Brass, Polycarbonate, POM, Carbon Fiber).
  • •It features a hybrid mounting system with PORON foam gaskets and snap-in silicone grommets for acoustic tuning.
  • •The kit comes with a wide array of accessories, including multiple hardness silicone grommets, PORON switch pads, and a custom carrying case.
Content CreationHaverworks Theseus75
  • •The integrated USB 2.0 hub on the Theseus75 is ideal for connecting a drawing tablet, macro pad, or audio interface directly to the keyboard.
  • •Dual rotary encoders can be mapped to timeline scrubbing, brush size, or volume control.
  • •RGB underglow, which the Ursa Major V2 lacks, can be used for visual feedback or aesthetic setup shots.

Frequently Asked Questions (FAQ)

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