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A free menu-bar app for macOS that shows live telemetry from the International Space Station: altitude, cabin pressure, cabin temperature, total mass, and consumables tank levels (urine, waste water, clean water). All data comes from this site (issmonitor.com).

Cabin pressure, temperature, mass and water-tank levels stream from NASA's public ISSLIVE Lightstreamer adapter. Altitude and ground track come from wheretheiss.at. Everything is served through the same /api/data endpoint the macOS app reads.

The website collects fresh telemetry every minute. The macOS app polls every 60 seconds. Tap the menu-bar icon then “Refresh Now” to force an immediate update.

Whichever one you pick. Click the menu-bar icon, choose any metric in the list, and that value (e.g. altitude, cabin pressure) will be shown next to the satellite glyph in the bar. The selection is remembered across restarts.

Yes. The menu-bar app has a toggle: metric (km, mmHg, °C, kg) or US (mi, inHg, °F, lb). Tank levels are always shown as a percentage.

First, check that you have internet access and that issmonitor.com loads in a browser and shows live data. If the site is up but the app stays empty, quit the app from the menu-bar and relaunch. If the problem persists, please email us with your macOS version and the message the app is showing.

Click the menu-bar icon and toggle “Launch at Login”. macOS may ask for permission the first time. You can also manage this in System Settings → General → Login Items.

macOS 13 (Ventura) or newer. The app is Apple Silicon native.

Yes. No subscriptions, no in-app purchases, no ads.

No. The app only makes anonymous HTTP requests to issmonitor.com to fetch the public telemetry data. It does not send any user identifiers, analytics, or telemetry of its own.