TRIDNet is the GUI version of TrID, probably more practical to use than the CLI version, especially for those not very familiar with the command line prompt.
Cost / License
- Free
- Proprietary
Alerts
- Discontinued
Platforms
- Windows

Apps similar to TrID include TrIDNet, which is free. Other options are xdg-utils, file, DROID and Toolsley File Identifier. In total there are eight apps like TrID for Windows, Linux, Mac and the web.
TRIDNet is the GUI version of TrID, probably more practical to use than the CLI version, especially for those not very familiar with the command line prompt.

file is a standard Unix program for recognizing the type of data contained in a computer file using magic numbers.
DROID (Digital Record and Object Identification) is a software tool developed by The National Archives to perform automated batch identification of file formats. Developed by its Digital Preservation Department as part of its broader digital preservation activities, DROID is...
Identify files based on the libmagic database in your browser. HTML5/JS port of the "file" tool. No downloads, no installation and no uploads!.

HexBrowser is a tool that identifies file types. It does not care about the file extension, but opens each file to look for signatures so it can determine the exact type of a file. It now recognizes more than 800 different file formats.

JHOVE is a file format identification, validation and characterisation tool. It is implemented as a Java application and is usable on any Unix, Windows, or OS X platform with appropriate Java installation.