Subler is free software for Mac that makes it easy to edit metadata in video files and add subtitles to QuickTime movies. With Subler, you can multiplex video, audio, chapters, subtitles and subtitle tracks from MOV and MP4 files. It also supports creating tx3g subtitle tracks, compatible with iPod, AppleTV, iPhone and QuickTime.

One of the outstanding features of Subler is its simplicity. It doesn’t have a traditional user interface. Instead, it only opens when you open a video file. Once opened, you can clearly see and edit the audio language, attached metadata, video format and duration. However, it should be noted that Subler can be prone to instability, especially when working with MP4 files.

While Subler is a useful tool for editing metadata and adding subtitles to QuickTime movies, it does have some limitations. The interface is limited in functionality and does not support DivX files, despite MP4 being the container for this format.

Overall, Subler is a useful app for those who need to edit metadata or add subtitles to QuickTime movies, although it may not be perfect.