Discover the amazing and unexpected world of clouds with


Your virtual guide to the wonders of the sky

From the fluffy Cumulus that form on a sunny day, to the rare Noctilucent clouds that shine from the fringes of space, the fleeting beauty and endless variety of clouds have always fascinated scientists and daydreamers alike.

Introducing 40 uniquely different cloud species and light phenomena with hundreds of spectacular photographs and extensive descriptions, CloudSpotter enables you to easily identify and spot them in the sky.

Become a CloudSpotter, build your collection, unlock Stars and Achievements as you join the global community and compete with other CloudSpotters around the globe!

An astounding, eye-opening experience for sky lovers and cloud novices of any age, created by Gavin Pretor-Pinney and The Cloud Appreciation Society.

Download CloudSpotter for iPhone and iPod touch


The World of Clouds: Introduction

CloudSpotter and NASA collaborate

CloudSpotter and NASA collaborate
  • By using CloudSpotter, you will help scientists better understand and model climate change. We are excited that NASA will use the data gathered by CloudSpotters around the globe to calibrate their CERES cloud-observing satellite instruments.
    The geo-tagged and verified cloud observations photographed by you and other CloudSpotters around the world will actively help research the crucial role that clouds play in global climate change. Read more in The Guardian

Explore the fantastic world of clouds, learn how to spot them and become a cloud expert

Collect clouds, unlock Stars and Achievements and compete against CloudSpotters worldwide!

CloudSpotter in the media

In the media

CloudSpotter driving Asperatus research

CloudSpotter driving Asperatus research
  • Crowdsourced data collected by CloudSpotters around the globe contributes to the research of the entirely new cloud type classification Undulatus asperatus.

    The ominous-looking clouds appear in heavy skies with a rolling pattern that inspired the proposed name, which loosely translates as "roughened waves". The Royal Meteorological Society is currently gathering evidence of the type of weather patterns in which the clouds appear, a task in which CloudSpotter aims to aid. If successful it will be the first cloud formation added to the International Cloud Atlas of the World Meteorological Organization since 1951. Read more on Channel 4 News

    Photo by Christopher Singer

The perfect incentive for keeping your head in the clouds