An air purifier that cleans your air, tracks what's in it, and shows you everything on a built-in screen. No phone needed.
It purifies your air. A medical-grade HEPA filter captures 99.97% of dust, pollen, smoke, and allergens. The fan speeds up when the air gets bad and quiets down when it's clean.
It monitors your environment. Built-in sensors track dust, allergens, CO2, chemicals, temperature, humidity, air pressure, and light. Each one is there because the reading actually matters to your health — not to pad a spec sheet.
It respects your privacy. No cloud account. No telemetry. Linden runs on your local network, and your data stays on the device. If we disappeared tomorrow, it would keep running.
Every surface has a job. Hover to pause, or just watch it turn.
Chosen to age well, not to hit a price point.
Hand-finished crown and accent panels. Every unit looks slightly different because real wood does.
Machined and anodized enclosure. Conducts heat away from electronics. Doesn't yellow, crack, or creak.
3.7-inch e-ink screen. Readable in direct sunlight. Zero power draw between refreshes.
Sensirion and Bosch sensors. Calibrated on-device.
Your air quality, sensor readings, and system status — always visible, no phone required.
It looks like paper behind aluminum. Because it basically is.
Most air purifiers need an account, an app, and send your data to the cloud. Linden doesn't. Your data stays on the device. Export it anytime if you want it.
The device pulls outdoor air quality data from the EPA every hour and compares it to what's inside your home.
When wildfire smoke pushes outdoor PM2.5 to 80 and your indoor reading is 8, you can see exactly what the filter is doing for you.
Every morning, the e-ink display shows overnight CO2 levels — average, peak, and a ventilation grade. High CO2 in bedrooms causes cognitive fog and poor sleep. Linden tracks it so you don't have to guess.
When PM2.5 and VOC both spike — the signature of frying, sauteing, or toasting — the fan automatically boosts to clear the air faster. No manual turbo button. It settles back down on its own when the air clears.
Set fan schedules by time of day — quiet at night, responsive during the day. The device follows your routine and adapts to what the sensors are reading.
Time-based schedules, sensor-triggered responses, and smart home integration work together without requiring any manual intervention.
We design the enclosure, source the components, assemble the boards, and test every unit ourselves.
When something can be replaced, repaired, or upgraded, we design for that. The HEPA filter slides out with a magnetic panel. The software updates over your local network.
The American linden — called basswood in Wisconsin, where we build Linden — is one of the most common trees in the state's forests. Scientists use its broad, heart-shaped leaves to measure urban air quality because they capture particulate matter with remarkable efficiency.
For centuries before that, communities gathered under linden trees to hold court, because tradition held that no one could tell a lie in its shade. Its wood is the choice of master carvers — prized for its fine grain and the way it responds to skilled hands.
We thought all of that sounded like a good name for something you trust with the air your family breathes.
The full list.
Linden is in active development. We'll email you when prototypes are ready.
Email notifications aren't wired up yet — we're building in the open. Check back soon.