Terms of Use
Sky Calendar for iPhone · Last updated: 31 October 2026
These terms apply to the Sky Calendar app and its optional Plus upgrade. They add to Apple's Licensed Application End User License Agreement, which also applies. Where the two differ, these terms apply to the app's own features and Apple's agreement applies to the App Store. Nothing in these terms limits the rights you have as a consumer under the law of your country.
Who provides the app
Sky Calendar is provided by Mátyás Szabó, a private individual based in Hungary.
Contact: skycalendarapp@proton.me
The free app
The app is free to download and use. It shows sky events for the cities you choose, the sky tonight, and reminders. How we handle your data is described in the Privacy Policy.
Sky Calendar Plus
Plus unlocks extra planning features. It is sold through the App Store in three forms:
| Plan | How it works |
|---|---|
| Monthly and Yearly | Auto-renewing subscriptions with a 7-day free trial for new subscribers. Payment is charged to your Apple ID when the trial ends, and the subscription renews at the end of each period unless you cancel at least 24 hours before. You can cancel in iOS Settings → your name → Subscriptions; Plus stays active until the end of the period you paid for. |
| Lifetime | A one-time purchase with no renewals. It unlocks Plus for as long as the app is offered, on every device signed in to your Apple ID. "Lifetime" refers to the life of the app, not of the buyer. What happens if the app is discontinued is set out below. |
Prices are shown in the app and on the App Store in your local currency before you buy. All plans can be shared with your family through Apple Family Sharing. Apple processes every payment; we never see your payment details.
Refunds
Refunds for App Store purchases are handled by Apple. You can request one at reportaproblem.apple.com. We cannot issue refunds ourselves.
Changes to features and prices
We may improve, change or remove features. We will not remove a Plus feature from people who already pay for it without either replacing it with something of similar value or giving notice in the app. Price changes for subscriptions follow Apple's rules: you are told in advance and, where required, asked to agree.
If the app is discontinued
If we decide to stop offering Sky Calendar, we will:
- announce it in the app at least 6 months before the online services stop, and stop selling Lifetime upgrades at the same time;
- keep the app working on your device with the data it can store offline. Turn on Offline mode in Profile to save, for your cities, the precomputed events up to 2076, eclipse paths, observing sites and map points. The sky tonight, the Moon calendar and the sky view are calculated on your device and keep working, as do reminders for saved events, which are then scheduled on your device.
Features that need fresh data from our server stop when the online services end: aurora alerts, cloud forecasts, ISS passes, comets, sign-in and syncing between devices. Active subscriptions will not renew after the announcement, and you will not be charged for periods after the services stop.
Accuracy and safety
Event times, positions and forecasts are calculated from public astronomical and weather data. We work to keep them accurate, but weather, aurora and visibility forecasts are estimates and can be wrong. Do not plan travel or expenses on them alone.
Never look at the Sun without certified solar eclipse glasses or a proper solar filter, including during a partial eclipse. Looking at the Sun can permanently damage your eyes.
Observing sites on the map are suggestions drawn from public map data. Check that a place is open to the public, safe and legal to visit at night before you go, and follow local rules.
Acceptable use
Do not misuse the app or its server, for example by trying to access other people's data, copying the app's data in bulk, or interfering with the service.
Liability
We are liable without limit for damage caused intentionally or by gross negligence, and for injury to life, body or health. In other cases we are liable only for foreseeable damage caused by breaching an essential obligation of these terms, and only up to the amount you paid for Plus in the 12 months before the damage. This does not affect any liability that cannot be limited by law.
Law and disputes
These terms are governed by Hungarian law. If you are a consumer, you also keep the protection of the mandatory laws of the country where you live, and you can bring a claim in the courts there. Please contact us first; most problems can be solved by email.
Changes to these terms
If these terms change, the new version is published on this page with a new date. Significant changes are also announced in the app. Changes do not reduce the rights you have under a purchase you made before the change.