Last updated June 2026
SkyTonight is built to answer one question — is tonight worth going outside? — without asking much of you in return. This page explains, plainly, what the app collects, why, and what it never does. It describes exactly what's declared in the app's privacy nutrition label on the App Store — nothing more, nothing hidden behind it.
Your location. SkyTonight uses your device's location — both precise and approximate — to work out what's actually visible from where you're standing: which planets and stars are above your horizon, how dark your sky gets, and when your viewing window opens. This is the app's core function; without it, SkyTonight can only guess at your sky instead of knowing it. If you don't grant location access, the app uses a default location and tells you it's doing so.
An anonymous installation identifier. SkyTonight generates a random identifier on your device — not your name, Apple ID, email address, or anything that identifies you — so that, in aggregate, we can tell whether its predictions are actually accurate and where they fall short. This identifier cannot be traced back to you.
That's the complete list. SkyTonight has no accounts, asks for no name or email, and collects nothing beyond what's described above.
Your location is used on your device, in the moment, to calculate what's visible in your sky right now. The anonymous installation identifier — together with coarse, rounded location and the sky conditions the app observed — is sent to the backend that Lexman Kumar runs, so that predictions can be checked against what people actually saw and improved over time. None of it is linked back to you, and none of it leaves that system.
If you allow notifications, SkyTonight schedules reminders — for example, a few minutes before your sky gets dark enough for naked-eye viewing, or before an event you've asked to be reminded about. These are scheduled on your device and can be turned off at any time, in iOS Settings or from within the app.
SkyTonight isn't directed at children and doesn't knowingly collect information from anyone under 13.
If this policy changes, the date at the top of this page changes with it. We don't expect to need to change it often — keeping SkyTonight's approach to your data this simple is the goal, not a starting point.
SkyTonight is developed and operated from San Jose, CA. Questions about this policy, or about how SkyTonight handles your data, can be sent to hello@watchskytonight.com.