The Theseus75 is a premium 75% split mechanical keyboard that packs a plethora of unique features into a classic, balanced design.
Explore every shade
Available in ten distinct colors with both anodized and electrophoretic finishes, thoughtfully curated based on community input.
Magnetic interlock
Custom-made, pre-paired neodymium magnets snap together for a seamless look and satisfying feel. Secured with stainless steel screws—no adhesives—they're easy to remove, replace, or swap out for things like silicone bumpers down the line.
Perfect for
peripherals
With integrated USB hubs, you can conveniently connect your numpad, mouse, flash drive, security key—even your phone. ⚡️
...on
either side.
Either side can function as the hub, no matter which one connects to your computer. We don't know of any other split keyboard that can do this.
Or as a side
on its own.
Perfect for when all you need is W, A, S, and D.
Hybrid
mounting
system
Combines silicone grommets and slow-rebound foam gaskets to achieve a balanced intersection between sound and feel.
Specially-designed silicone grommets snap gently into the sides of each switch plate, helping to align, secure, and suspend the assembly.
Color-coded by durometer and slotted for optional screws, you can choose between a soft or firm typing experience—whatever suits your style.
The split problem
To create the enclosure, many split keyboards rely on the plate resting directly against the case itself. This contact can create unwanted resonance and resistance, negatively affecting the overall sound and feel.
The Theseus solves this by having the plate foam pull double-duty: by resting against the inner polycarbonate walls, this extra-soft, slow-rebound foam creates a gasket between the plate and case—protecting the PCB, improving acoustics, and evenly cushioning your keystrokes.
Friction-
knob mount
Each knob is secured with a precise friction fit, obscuring any unsightly screws and making it easy to swap in other colorways or custom knobs.
RGB
underglow
You can't use solid slabs of frosted polycarbonate and not let a little light shine through.
Supports the full gamut of QMK matrix lighting effects.
Extras, extras
With multiple materials and colors for plates, cables, knobs, and grommets, there are over 2,000 unique build combinations—not including switches and caps.
That's a lot of personalization.
Reviews
Don't just take my word for it—see what the community thinks.
FAQ
Why the name “Theseus?”
Theseus was born out of the many times I've started this project over from scratch: rebuild after rebuild, was it still the same board I started with? Figured I'd leave that one to the philosophers. In either case, as something you can take apart and put back together, the name just felt right.
Is there a wireless option?
No—given the integrated USB hubs and the aesthetic choice of connector, this board was not designed to be wireless. Bright side: more room for self-expression with a custom cable.
Will the board still work if I only plug in one half?
Yes. Not a bad idea for gaming. 👾
Can I buy each half in a different color?
Not at this time. I would love to offer this, but with ten international vendors, supporting all possible color combinations would add an overwhelming amount of logistical complexity.
However, if you are interested in swapping halves with fellow Theseus75 owners, check out the #exchange channel in the Haverworks Discord.
Are there tenting options?
Unfortunately, no. Though this was considered, I could not find an organic solution that did not compromise the original design intent in some way. However, I am exploring a separate tenting accessory—if there is enough interest, it could be offered as an add-on item. 🤞
Wait, why are some hot-swap sockets north-facing? What about my GMK keycaps?
In order to achieve a seamless split without compromising the rest of the design (or adding undue complexity and cost), the first column of sockets on the right PCB are rotated 180° from the rest, making them “north-facing” (you can find other split boards that do this as well). For certain combinations of switches and keycaps—most notably with the Cherry profile—there is a potential for interference between the keycap and the switch, particularly on row three. (:3ildcat has a video demonstrating this with a few combos.)
Although in theory this would only ever affect one key on this board (the “H”), there are a few ways to mitigate this issue if it becomes bothersome:
- Choose the solder PCB, which supports an all-south-facing alpha layout.
- Use long-pole switches, which extend slightly past the top housing when depressed.
- Add a spacer (e.g., an o-ring, a gasket, or even paper) to the keycap stem for more clearance.
- Try out a different profile! Cherry is great, but there are so many other classic profiles (and new ones) that offer a great typing experience. Don't knock 'em till you try 'em. 😎
The board I want is out of stock. Will there be more?
There are currently no plans for another production run at this time—so if you see the one you'd like, don't hesitate. Remember, if your local vendor no longer has stock, you can always check other regional vendors for availability.
Specifications
Measurements
- 6° typing angle
- 20mm front height
- 36.6mm total height (case bottom to top)
PCB
- Designed by ebastler
- ANSI (hot-swap/solder) and ISO (solder) layouts
- 1.6mm black-core FR4 w/ black solder mask and ENIG finish
- uDB S1-inspired daughterboards
- STM32G431 microcontrollers
- QMK firmware w/ VIA support
- USB 2.0 hubs w/ dual-role USB-C ports
- Alps EC11 encoders w/ 1.5mm push travel
- RGB LED underglow
- Caps lock LED
- ESD protection for USB datalines and VBUS
Materials
- 6063 aluminum frame w/ anodized or electrophoretic (e-coating) finishes
- Polycarbonate base w/ frosted finish
- Polished/satin chrome-plated brass quick-detach connectors
- Polished PVD-coated brass knobs w/ gold, black, or chroma finishes
- Aluminum knob mounts
- N52 Neodymium (NdFeB) magnets
- PORON® extra-soft slow-rebound gaskets and switch pads
- 50A and 70A silicone grommets
- 70A silicone knob mount O-rings
- 50A silicone friction-fit feet (no adhesive required)
Plates
- Black-core FR4 w/ black solder mask and ENIG finish (included in base kit)
- 5052 aluminum, anodized black
- Brass
- Polycarbonate, clear
- POM, black
- Carbon fiber
Cable & Connections
- Wired USB-C connectivity
- Genuine Molex® flat-flexible cables (FFCs) for daughterboards
- Genuine Molex® Pico-EZmate "High-Current" (HC) connectors for main PCBs
- "FEMO" (LEMO®-compatible) 1B 5-pin panel-mount sockets
Interconnect cable
- 0.8m length
- Woven PET outer sleeving
- 22/28 AWG conductors
- Shielded USB data lines for passthrough
- "FEMO" (LEMO®-compatible) 1B 5-pin push-pull connectors
Kit Contents
Base Kit
- Aluminum frames (L+R)
- Polycarbonate bases (L+R)
- PCBs and daughterboards (L+R)
- FR4 plates (L+R)
- Gaskets (L+R)
- Switch pads (L+R)
- Switch pad stickers
- Interconnect cable
- Panel-mount connector cables
- Flat flexible cables (FFCs)
- Knobs
- Knob mounts
- Knob mount O-rings
- Silicone feet (1 set black, 1 set white)
- 50A grommets (blue)
- 70A grommets (purple)
- Ring magnets (2 pairs)
- Standoffs
- Standoff screws, plate side
- Standoff screws, PCB side
- Grommet screws
- Case screws
- Daughterboard screws
- Magnet screws
- Knob mount screws
- Custom carrying case
- Assorted tools
Wrist Rest
- Aluminum accents (L+R)
- Polycarbonate bodies w/ threaded inserts (L+R)
- Silicone feet (1 set black, 1 set white)
- Ring magnets
- Magnet screws
- Assembly screws
Requirements
(Not Included)
- 88–91 MX-compatible switches
- 3–5 2U stabilizers
- Keycaps
- Host USB cable (USB-C-to-C required for 1.5A USB-PD)