Show HN: I spent 2 years designing a mechanical Magic Keyboard

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The Altar II is a masterclass in industrial design, merging a premium mechanical typing feel with a chassis that defies belief. It offers an incredibly precise, tactile experience while remaining shockingly slim.

🛠️ Engineering Breakthroughs

Through innovative engineering, the Altar II manages to fit a full mechanical switch into a miniature frame. By utilizing a steel construction, the device ensures maximum durability and a long operational lifespan.

The secret to its profile is a preloaded tension spring oriented laterally rather than vertically, which allows for a total vertical travel distance of only $1.8\text{mm}$ .

Thickness Comparison

The Altar II completely redefines the "low profile" category. See how it stacks up against the competition:

Keyboard Model	Type	Thickness
Altar II	Fully Mechanical	4.75mm
Logitech MX Keys	Non-Mechanical	10.09mm
NuPhy Air75	Fully Mechanical	20.50mm
Keychron K2	Fully Mechanical	21.00mm
IBM Model M	Fully Mechanical	30.00mm
M-Dial	Fully Mechanical	50.00mm

🎡 Introducing the M-Dial™

The M-Dial™ is a versatile control knob that adds a new dimension to your workflow:

Twist: Adjust system volume.
Single Click: Play or Pause.
Double Click: Skip forward.
Triple Click: Go back.

Design Philosophy: The M-Dial™ is designed for flexibility. It snaps off effortlessly for travel, and you can swap it for the included low-profile version or create your own. To support the community, all 3D files, specifications, and drawings will be released publicly.

All M-Dial™ behaviors are fully customizable via the Altar II companion application.

⚡ Sensory Experience: Haptics & Audio

The Harmonic Synthesiser™

This system provides crisp, expressive haptic feedback that transforms how you interact with your Mac:

Real-time Ticks: Simulated tactile clicks when using the M-Dial™.
System State: Subtle pulses when the device wakes or connects.
Modifier Cues: A smooth, oscillating hum when holding a modifier key.
Confirmation: A gentle "pop" upon completing a shortcut.
Notifications: Tactile taps for Mac alerts and reminders.

You can fine-tune these sensations using the EMO app.

High-Fidelity Audio

A built-in speaker provides elegant audio cues, such as charging chimes and wake-up sounds.

💻 Software Integration

The Altar II is Made for Mac, featuring a lightweight native app written in Swift.

App Capabilities:

Remap key bindings.
Configure M-Dial™ actions.
Adjust backlight, haptics, and audio volume.
Create app-specific shortcuts (e.g., Figma, DaVinci Resolve, VS Code).
Deep macOS integration for system-level haptic notifications.

Note: Basic functionality remains available on any OS without the app.

🌙 Health & Wellness

NiteLite™

To protect your sleep and vision, NiteLite™ activates automatically in dark environments. It utilizes a long-wavelength amber-red light to ensure your circadian rhythm remains undisturbed, reducing eye strain and preserving natural night vision.

Ergonomics & Layout

The Altar II features a 75% layout, including a full function row and standard arrow keys. The EMO typing system uses distinct key shapes for different regions, making touch typing intuitive.

Wrist Health Comparison:

Standard Mechanicals: High leading edges often force the wrist into extension.
Altar II: The $< 5\text{mm}$ chassis minimizes wrist extension, reducing the risk of $\text{RSI}$ or Carpal Tunnel Syndrome.

🔇 Acoustic Engineering

The Inertial Damper™ ensures a refined sound profile through a dual-layer system:

A silicone membrane situated between the monobody and the logic board.
An oversized elastomer footpad on the bottom.

This architecture suspends the typing platform, providing total isolation from vibrations.

Typing Test Specs: Recorded on pre-production hardware. Gear: Zoom H5 | 24-bit/48kHz | XY Stereo | 40cm distance | 80Hz High-pass

🔋 Internal Architecture & Sustainability

Fitting this technology into a slim frame required extreme miniaturization.

The "Under-the-Spacebar" Hub:

Harmonic Synthesiser™
Proximity sensors
LED matrix driver
Wireless antenna
Central Processing Unit (CPU)

The M-Dial™ Plinth: Contains the Hall Effect sensor array, fast-charging circuits, and the ambient light sensor.

Eco-Friendly Commitment

Materials: Chassis machined from a single block of recyclable aluminum; plastics contain $\ge 50\%$ recycled content.
Packaging: 100% paper and biodegradable sugarcane pulp.
Logistics: Reduced packaging volume leads to fewer shipping trips.

Power Management

The device utilizes a vertically expanded battery casket to maximize capacity.

$\text{Charging Efficiency} = \frac{2\text{ days of use}}{2\text{ minutes of charging}}$

Fast Charge: 2 minutes of USB-C charging $\approx$ 2 days of use.
Total Battery: Up to 30 days (based on 8hr workdays with 30min backlight use).