Built by shooters,
for the way you shoot.

We're finalizing the production-run cost and will publish a price the moment we open orders. Reserving doesn't lock you in — it just gets you the email first.

The first production run is targeted within ~2 months of order open. Reservations will be filled in the order they were submitted.

Same shape as the workflow you already use: capture a wind read, take the shot. Where Zephyr differs is the truing tool — observe your impact, and the device back-calculates the wind that actually moved the bullet. Over a few shots the device learns the difference between what the meter reads at the bench and what the air is doing along the flight path. We don't claim to magically measure complex valley winds in real time; we claim to give you a tool that makes your wind calls measurably better, shot to shot.

Hundreds of hours of practical field use per charge — the device sleeps between shots and wakes instantly when you reach for it, so a typical hunt or match weekend doesn't come close to draining it.

If you keep it screen-on at full brightness with all sensors active and power savings disabled, you'll get around 30 hours of continuous always-on time. Deep-sleep runs for seasons; throw it in the safe and pick it back up next year. USB-C charging from any phone charger, power bank, or vehicle USB port.

Yes. WiFi is only used for optional OTA firmware updates, and is off by default. No telemetry, no cloud, no account. All profiles, stages, and calibrations live in on-device NVS storage.

Yes. Each profile supports up to 5 user-calibrated true-BC points across the velocity envelope. The solver interpolates between them by Mach number, so the drag the bullet sees at every point in flight matches what you've measured at the range.

Validated against published reference data and live chronograph drops well past 2000 yd. No solver replaces honest inputs — your velocity, your BC, your zero — but given honest inputs, Zephyr's outputs match the elite solvers. That's the point.

Set up the profile with whatever ammo info you have, take a few rounds at any distance you can measure, and Zephyr captures the environment per shot and back-solves the actual zero. Faster than a chrono, and works with factory ammo where the box specs lie.

Yes. Updates are optional, never automatic, never forced. Pick the latest, downgrade to a previous version, pin a release you trust — whatever you want. Updates arrive over WiFi when you ask the device to check; never when you don't.

Yes — that's not boilerplate. We've shipped features that started as customer messages within a week of getting them. Drop your suggestion in the reserve form's feedback field, or hit the contact link in the footer. We read every one.

BLE integration with several common rangefinders is on the near roadmap, delivered as a firmware update to existing devices. The hardware is provisioned for it.

The firmware is closed-source — that's the IP that makes Zephyr what it is. The live demo on this site runs the actual firmware on our server, so you can evaluate every screen and every solver path before you commit. Source access is negotiable for institutional partners.