Discover the amazing and unexpected world of clouds with Cloud-a-Day, your virtual guide to the wonders of the sky. 

With stunning photographs and enlightening descriptions, Cloud-a-Day will teach you to identify 40 different cloud formations and 18 optical effects caused by clouds. From the common Cumulus cloud or rainbow to the rare and fleeting fluctus cloud or circumhorizon arc, you will learn what makes each formation special, and how to identify the many beautiful light phenomena of the atmosphere.

Start building up your cloud collection by snapping photos of your own spottings to save them in the app. In a future app update, you will be able to earn stars and achievement and see pictures from other cloudspotters around the globe!

Don’t know what cloud or optical effect you are spotting? Just answer a few questions about it in the Cloud Identifier tool and we’ll tell you which it is likely to be, or use our new CloudSpotter AI to see which of the ten main cloud types our automatic system thinks you are spotting.

And if you’re a subscribing member of the Cloud Appreciation Society you will be able to log in to access your Cloud-a-Day emails. These feature photographs by Cloud Appreciation Society members of amazing formations around the world, short pieces of cloud science, inspiring sky quotations, and details of the sky in art.

With Cloud-a-Day, looking up will never be the same again!

What’s New

Version 2.2.3

Fixed an issue with the Cloud-a-Day stream for guest users

Ratings and Reviews

4.0 out of 5
8 Ratings

8 Ratings

Adiaz84 ,

Cannot report a cloud

When i either upload or take a picture of a cloud theres no option to report it

Alyejidnef ,

Can’t Report Clouds

Im a huge fan and member of the CAS, but this app has a flaw / error in that it doesn’t let you report spotted clouds. The developers need to fix it.

AJA151 ,

APP misinforms about chem trails

This app seems like a deliberate attempt to misinform the public about chem trails, calling them contrails.


Cloud Appreciation Ltd
49.2 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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