Plex's subtitle menu has a Search… option that looks up OpenSubtitles for the film you're watching. What it finds can be for a different cut, a second off, or missing in your language. StreamBridge gives the film subtitles timed to your copy, and translates when yours is missing.
A lookup, one film at a time. Search… queries OpenSubtitles by title and language; you pick a result and Plex downloads it as an external subtitle. It needs an OpenSubtitles account signed in to Plex, and free accounts have a daily download limit. Plex doesn't check the timing or translate.
A film gets its subtitles once it's in Plex, timed to that file. In Plex they're ordinary subtitles in Plex's own menu, on every device.
Plex's own subtitle menu: the subtitles a film already has, then Search… and Upload…. The ones StreamBridge adds appear here too.

| Topic | StreamBridge | Plex's subtitle search |
|---|---|---|
| What you get | Subtitles for the film, timed to your copy | Every OpenSubtitles upload for the title and language, for you to choose from |
| Language missing | Translated for you | Nothing to show |
| Two languages | One subtitle, a second line under the first | One subtitle at a time |
| Where you do it | Before you sit down: the film's Watch view | In the player's subtitle menu |
| Cost | Pro, a one-time purchase | Free and built in, within OpenSubtitles' daily limit |
A subtitle made for one cut of a film drifts on another, and Plex lists every upload for the title and leaves you to guess. StreamBridge starts from the subtitle made for your release and times it to your copy. How it works →
A subtitle that's a second off is awkward to fix with Plex's offset setting on a TV remote. StreamBridge times its subtitles to your copy before you press play.
Many films only have English and Spanish subtitles, and when Plex's search comes back empty there's nothing more to try. StreamBridge translates the best subtitle it found.
Plex shows one subtitle at a time. StreamBridge can show two languages as one subtitle, a second line under the first.