Castly is a free mobile application that allows users to cast videos, photos, and music from their phones to smart TVs, Chromecast, and Roku. With this app, users can also cast web videos or IPTV found online from websites.

The app is straightforward to use, and the user interface is well designed. It is effortless to connect to the casting receivers, and the streaming quality is good. However, to stream online movies to TV, a good internet connection is required.

In case of any connection problems, the troubleshooting guide provided by the developer is helpful. Most connection problems can be resolved by restarting the casting receivers or phone.

Overall, Castly is a reliable app for casting media content to TV. It is free to use and has no in-app purchases, making it an excellent choice for those who want to cast their phone's content to TV without spending any money.