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OpenSubtitles Sub-Zero

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Self-Hosted Open Source Automation Media Home Server Download Management Subtitles

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Last Updated: 07-16-2026 03:34 AM (UTC)

Bazarr

Subtitles are the one chore Sonarr and Radarr leave behind - Bazarr finishes the *arr media stack by automating them. It connects to both via their APIs and mirrors their libraries - it doesn't scan disk itself, it manages exactly what your *arr apps index. For every monitored episode and movie it checks existing internal and external subtitles against your language profiles, then hunts missing ones across dozens of providers - OpenSubtitles.com, Podnapisi, Addic7ed, Subscene, and many regional sources - covering 184 subtitle languages including forced/foreign-dialogue tracks. Matching is smarter than filename guessing: releases are compared by release group and source, some providers support exact file-hash matching, and every downloaded subtitle gets a percentage score. Set a minimum score per Sonarr/Radarr connection and Bazarr rejects weak matches; enable upgrades and it replaces previously downloaded subtitles when better ones surface. Out-of-sync files get fixed too - automatic subtitle synchronization realigns timing after download, triggered only below a configurable score threshold so good subs aren't touched. Per-show and per-movie language configuration, download history, manual on-demand search, and adaptive searching that throttles provider API calls round it out, all behind a clean Sonarr-style web UI written in Python. If your library serves multilingual viewers, this removes the last manual step.

Bazarr

Benefits

  • No More Subtitle Hunting
  • Missing subtitles are found, downloaded, and named correctly for every monitored item automatically.
  • Quality You Can Enforce
  • Percentage scoring with minimum thresholds rejects bad matches; upgrades replace them when better ones appear.
  • Sync Problems Fix Themselves
  • Automatic timing synchronization realigns out-of-sync subtitles right after download.
  • Serves Multilingual Households
  • Per-show and per-movie language profiles across 184 languages, including forced tracks.

Features

  • Sonarr and Radarr Integration
  • Mirrors both libraries via API and reacts as new episodes and movies are imported.
  • Dozens of Providers
  • OpenSubtitles.com, Podnapisi, Addic7ed, and many regional sources searched together.
  • Score-Based Matching
  • Release-name, hash, and fuzzy matching produce a score gated by your minimum threshold.
  • Automatic Synchronization
  • Realigns subtitle timing after download, triggered below a configurable score.
  • Subtitle Upgrades
  • Replaces previously downloaded subtitles when higher-scoring ones become available.
  • History and Manual Search
  • Full download audit trail plus on-demand search when you want to pick yourself.