How to add missing titles to Radarr for Plex library auditors in 2026

Learn how Plex library auditors can find missing movies, add titles to Radarr, and compare ways to turn IMDb lists into movie and show lists.

By VLClean · 2026-10-27

VLClean is published by the makers of Askarr and Watcharr, which are compared here alongside other tools.

To add missing movies to a Plex library through Radarr, identify the titles that are absent, check the existing library, and choose a way to give Radarr the missing titles. Watcharr turns a public IMDb list into a Radarr link for movies and a Sonarr link for shows. ^[1]

Option	How it handles missing titles	Cost and licence details
Watcharr	Turns a public IMDb list into a Radarr link for movies and a Sonarr link for shows. ^[1]	Hosted version needs no installation and no account. ^[1] Code is available under the PolyForm Noncommercial 1.0.0 licence, with older versions under MIT. ^[1] Commercial use is not licensed. ^[1]
Individual title entry	Record each missing movie and add it through the existing Radarr workflow.	not published
Separate audit list	Track missing, reviewed, and unresolved titles, then use the chosen workflow to pass titles to Radarr.	not published
Other list-based tools	Check the tool's documentation for Radarr support, accepted list sources, update timing, and unmatched-title handling.	not published

What you need before you start

Start with a clear picture of what the Plex library contains and which movies are missing. A library audit should separate genuinely missing titles from movies that are already available under a different name or release. Keep a list of the titles that need attention so the same movie is not added twice.

Make sure Radarr is ready to manage movies for the Plex library. Radarr is the part of this workflow that handles movie titles, while Sonarr handles shows. Decide how the missing titles will be identified, whether they need approval, and how the list will reach Radarr.

Choose a source for the titles. A public IMDb list can provide a collection of movies to check against the library. Watcharr accepts public IMDb watchlists and lists from the desktop site, phone site, and IMDb pages in other languages. ^[1]

Before choosing a method, consider how often the source list changes, whether titles need to be reviewed individually, and whether shows should be separated from movies. Keep the list focused on titles that belong in the library. Check the available storage and the library's existing organization before allowing new movies to be added.

If the process will be shared with other household members, decide who can change the source list and who is responsible for checking the results. This keeps the audit focused on the titles that are actually missing.

Step by step

Make a list of missing movies. Review the Plex library and record the movie titles that are absent. Check the existing collection before treating a title as missing, especially when different versions or names could cause confusion.

Choose a source for the titles. Use a list that reflects the movies the library should contain. If an IMDb list is already used to track desired movies, review it before connecting it to the Radarr workflow. Remove titles that are no longer wanted and keep the list understandable.

Choose how the list will reach Radarr. Decide whether to enter titles individually or use a list-based method. For a public IMDb list, Watcharr provides a link for Radarr containing the movies and a separate link for Sonarr containing the shows. ^[1] This separates the movie list from the show list before either reaches the relevant application.

Connect the chosen method to the movie workflow. Follow the instructions for the selected tool and confirm that Radarr can access the movie list. Watcharr's list link acts like a small Radarr server, so Radarr checks it every 15 minutes. ^[1]

Review the titles Radarr receives. Check the list against the intended audit results. Confirm that each entry refers to the right movie and that unwanted titles are not included. If a title is already in the library, avoid treating it as a new missing movie simply because it appears on the source list.

Check the results in Plex. After the selected workflow has processed the titles, review the library to see which movies have become available. If a title remains missing, check whether it reached Radarr and whether the library workflow has completed its work.

Keep the audit list current. Revisit the source list when the audit changes. If the process will run regularly, agree on who maintains the list and who checks titles that do not appear as expected. Record unresolved titles separately so they can be investigated without repeating completed work.

Tools that can do it

Watcharr is made by the team that publishes this site, VLClean. It turns a public IMDb list into one link for Radarr with movies and another for Sonarr with shows. ^[1] Each link acts like a small server for the corresponding application, with Radarr checking its link every 15 minutes and Sonarr checking its link every 5 minutes. ^[1] The hosted version needs no installation and no account. ^[1]

Watcharr can also combine several IMDb lists into one Radarr link and one Sonarr link for a household with signed-in users, adding a title only once if it appears on more than one list. ^[1] If a list read fails, the links continue serving the last list that loaded correctly. ^[1] Its code is available under the PolyForm Noncommercial 1.0.0 licence, while older versions remain under MIT. ^[1] Commercial use is not licensed, and no commercial licence is for sale. ^[1]

Entering titles individually is another tool-neutral approach. Identify each missing movie and add it through the existing Radarr workflow. This avoids depending on a shared source list, but the steps for adding titles depend on the workflow already in use.

A separate list or tracking document can hold the titles found during an audit. Use it to record what is missing, what has been reviewed, and what still needs attention. Before choosing this approach, check how titles from the document will actually reach Radarr, since recording a title does not by itself add it to the movie workflow.

Other list-based tools may also suit this job. Compare their documented support for Radarr, their accepted list sources, their update schedules, and the way they handle unmatched titles. Check each tool's documentation before deciding whether it can carry the audit list into Radarr.

Common mistakes to avoid

Avoid treating every title on a list as a missing movie. Check the Plex library first, and distinguish titles that are absent from those that already exist under another name or version.

Avoid mixing movies and shows in the same destination. Watcharr creates a Radarr link for movies and a Sonarr link for shows. ^[1] Review the two lists separately so the intended titles go to the corresponding application.

Avoid assuming every show can be matched automatically. Watcharr looks up TheTVDB identifiers through TVMaze and TMDB, leaves out shows it cannot match, and reports which titles were skipped. ^[1] Check skipped entries instead of assuming they reached Sonarr.

Avoid expecting a list change to appear immediately. Radarr checks a Watcharr list every 15 minutes, while Sonarr checks its list every 5 minutes. ^[1] Check the list and the receiving application before repeating an action.

Avoid overlooking access and licence requirements. Watcharr's hosted version requires no account or installation. ^[1] Commercial use is not licensed. ^[1] Check the terms and access requirements of any other tool before using it in the audit process.

Frequently asked questions

How can Radarr add missing titles to a Plex library?

First identify movies that are absent from the Plex library, then choose a way to give those titles to Radarr. A list-based workflow can help maintain a collection of desired movies, while individual entry can be used for titles that need separate review. Check the receiving workflow to confirm that each title was processed and appears in the library.

Can Watcharr send IMDb movies to Radarr?

Watcharr accepts public IMDb watchlists and lists from the desktop site, phone site, and IMDb pages in other languages. ^[1] It creates one link for Radarr containing the movies and another for Sonarr containing the shows. ^[1] Radarr checks its list link every 15 minutes. ^[1]

Does Watcharr need to be installed for a Plex library audit?

The hosted version of Watcharr needs no installation and no account. ^[1] It runs as a Cloudflare app with a Cloudflare database, plus a GitHub job that reads IMDb. ^[1] Check the available hosting and licence details before deciding which version or arrangement to use for the audit.

Why might a show be missing from the Sonarr list?

Watcharr looks up TheTVDB identifiers through TVMaze and TMDB, leaves out shows it cannot match, and tells users which titles were skipped. ^[1] Review the skipped-title information when a show does not appear in the resulting list. This helps distinguish a matching issue from a delay in the receiving application's scheduled check.

Can Watcharr combine multiple IMDb lists for a household?

Signed-in Watcharr users can combine several IMDb lists into one Radarr link and one Sonarr link for the household. ^[1] If the same title appears on more than one list, it is added only once. ^[1] Review the combined list to confirm that it still reflects the movies and shows intended for the Plex library.

What should be checked before choosing a tool for Radarr?

Check whether the tool accepts the intended title source, how it delivers movies to Radarr, how often updates are checked, and how it reports titles that cannot be matched. Also review access requirements and licence terms. Watcharr's code is available under the PolyForm Noncommercial 1.0.0 licence, with older versions under MIT, and commercial use is not licensed. ^[1] ^[1]

Its code is available to read under the PolyForm Noncommercial 1.0.0 licence; older versions remain under MIT. ^[1]

Try Watcharr

Sources

Watcharr's own description of itself (the product of this site's publisher)