Bazarr is described as 'Companion application to Sonarr and Radarr that manages and downloads subtitles based on your requirements' and is a subtitle downloader in the video & movies category. There are four alternatives to Bazarr for a variety of platforms, including Mac, Windows, Linux, Android and Arch Linux apps. The best Bazarr alternative is Caption, which is both free and Open Source. Other great apps like Bazarr are SubDownloader, Qnapi and SubHub.
Caption takes the effort out of finding and setting up the right subtitles. A simple design, drag & drop search, and automatic downloading & renaming let you just start watching. Caption is multi-platform, open-source, and built entirely on web technology.
SubDownloader is a program for automatic find and download/upload subtitles for your movies/series (MKV,MP4,AVI,etc).
QNapi is designed to automatically download and match subtitles to a specific movie file. Unlike similar programs, QNapi queries several different subtitle databases to find the best subtitles for your movie.
SubHub is a small lightweight subtitles app downloader that’ll provide you with a modern UI and easy to use interface.
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This has the same purpose as bazarr. However, it does not come with any of the automation and integration with your existing library.