CieliBlu
Planes and contrails overhead
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Have you ever looked up at the sky, seen a plane with a long white trail behind it and wondered which plane it was, and why some trails last only a few seconds while others stay visible for hours? CieliBlu helps you find out, and lets you contribute a real observation to a citizen science project on aircraft contrails.
HOW IT WORKS
• Point your phone at the plane you see in the sky.
• CieliBlu works out the direction you're looking in using the compass and tilt, and compares it with real-time flight data (FlyItalyADSB ADS-B network) to identify the plane in front of you.
• Choose what you see behind the plane: no contrail, a short contrail or a persistent contrail.
• Take a photo: CieliBlu enriches it with the data of the identified aircraft (callsign, altitude, speed, heading and distance). After the search, the aircraft's position updates automatically and a crosshair helps you follow it.
• The app automatically retrieves the air temperature and humidity right at the aircraft's flight altitude: key data for understanding the conditions in which persistent contrails form.
WHY IT MATTERS
Persistent contrails can turn into thin clouds (contrail cirrus) that stay in the sky for hours, with a possible effect on the heat balance of the atmosphere. Real observations from the field are needed to better understand when and where this happens: every observation you record with CieliBlu is added to a shared archive, which can also be browsed on the project's website and is available to anyone who is curious or wants to study the phenomenon.
WHAT YOU GET
• A personal history of all your observations, with outcome, photos and weather data.
• The ability to review and correct your saved observations.
• A simple, immediate way to learn to recognize the planes flying over your town.
CIELIBLU PRO
With the optional CieliBlu Pro in-app purchase you get:
• No ads.
• A wider aircraft search cone and radius (up to ±30° and 200 km, compared with ±15° and 100 km in the free version), useful in very busy skies or when visibility is poor.
• Advanced history filters (by date, observed outcome, aircraft callsign/ICAO24) and filtered CSV export of your data.
PRIVACY
CieliBlu asks for access to the camera, motion sensors and location only to identify the plane you are watching and to link the observation to the correct coordinates and altitude. The location data sent can be made less precise in the settings.
CieliBlu is designed for anyone curious about the sky above their head: aviation and weather enthusiasts, teachers, students and anyone who wants to contribute to a citizen science project with a small everyday gesture.
SUBSCRIPTIONS
CieliBlu Pro is available as an auto-renewing monthly or annual subscription. Payment is charged to your Apple ID at confirmation of purchase. The subscription renews automatically unless it is turned off at least 24 hours before the end of the current period; you can manage or cancel it in your App Store account settings.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://www.ivan.it/cieliblu/CieliBlu.pdf
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
More reliable aircraft search: it now goes through CieliBlu's servers, even at peak times. Clearer error messages and minor fixes.
The developer, Ivan Berton, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Location
- Contact Info
- User Content
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Ivan Berton
- Size
- 28.6 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 10 more
- English, Dutch, French, German, Italian, Polish, Portuguese, Romanian, Spanish, Turkish, Ukrainian
- Age Rating
4+
- 4+
- Contains
Advertising
User-Generated Content
- In-App Purchases
Yes
- CieliBlu Pro Mensile $2.99
- CieliBlu Pro Annuale $17.99
- Copyright
- © 2026 Ivan Berton