Dedicated render core
A dual-core ESP32-S3 runs the light engine on its own real-time task at 60 fps, so networking hiccups can't stutter your sunrise.
Horizn · natural light engine
Wake the way your body was built to: to light, not to noise. Horizn paints a slow, natural dawn across your wall that brings you up gently and in rhythm with your circadian clock. It's the most awake I've ever felt at 4:34 a.m., and it will change your mornings too.
Every feature, forever. Your alarm clock should not have a monthly bill.
Horizn runs entirely in your home. It works when the internet doesn't.
Your wake time is nobody's data point. Nothing leaves your network.
Open local control, updatable firmware, hardware you actually own.
The light
Light is the master signal your body clock runs on, and Horizn gives your brain the real thing: the barely-there pre-dawn glow, the deep violet-to-ember climb of a high-mountain sunrise, and a brightness curve shaped to how your eyes actually perceive growing light. Your body reads it as morning and lifts you out of sleep the way it was meant to, calm and clear and already halfway to alert before your feet hit the floor.
The engine
An alarm that fails once is worthless. Horizn's firmware is built around that one fact, and I trust it as my only alarm clock, every single morning.
A dual-core ESP32-S3 runs the light engine on its own real-time task at 60 fps, so networking hiccups can't stutter your sunrise.
Every command travels a single atomic queue into the animation engine. No races, no half-applied states, no mystery behavior at 4 a.m.
Network-time-disciplined alarms, per-day schedules, wake-at-peak timing that counts backward so the room is bright when you need to be up.
A blink in the grid mid-sunrise? Horizn catches the timeline back up to where the light should be. Configurable, not chaotic.
Every alarm decision is logged on-device: what fired, when, and why. Trust you can inspect, not marketing you have to believe.
Over-the-air firmware updates, a local web interface on your network, and 16 MB of flash with room to grow.
Live demo: this is the actual product interface running its built-in simulator. Go ahead, tap around.
The control surface
Horizn's interface lives at a local address on your network, with no app store and nothing to install. While an alarm runs, the controls you need grow huge and everything else steps aside. At night, the screen itself dims to a faint ember clock so the thing that wakes you gently doesn't blind you at midnight. And because a wake-up this important should never be left to chance, we recommend pairing Horizn with a simple sound alarm as a backstop, so even your heaviest morning is covered.
And at the end of the day
Wasatch Evening winds the light down through amber, deep red, and magenta dusk: a sunset for winding down, a night light that respects your night vision, and a brightness cap so a 2 a.m. glass of water never blasts you awake.
Where it stands
Horizn is in the final engineering stretch before its first production run.
A handful of updates a year, first access to the initial run, and nothing else. Unsubscribe any time.