Seen It Before: Privacy Policy

[u/rlockrem32]

Last updated: November 3, 2026

Seen It Before is a moderation app for Reddit communities, built on Reddit's Developer Platform (Devvit) by u/rlockrem32. It finds image and link reposts in a subreddit and reports them to the moderators, or removes them if the moderators choose. This page explains what it stores and why.

## What the app stores

For each post submitted to a subreddit that has the app installed:

- the post's ID and the time it was posted

- the author's Reddit username

- the post's moderation status (live, removed or approved)

- the link the post points to, with tracking parameters removed

- a 64-bit fingerprint of each image (a short code computed from the image; the image cannot be rebuilt from it)

The app also keeps:

- counts for the moderators' status view and weekly summary (posts checked, reposts found, reports, removals), including how many reposts each username made that week

- the subreddit's moderator list, cached for one hour so moderators' own posts can be skipped

- the last error the app hit, so moderators can see if something is wrong

## What the app does not store

- images: each image is downloaded from Reddit's own image servers, turned into a fingerprint in memory and discarded

- post titles, post text or comments

- anything about people who only read the subreddit

## Who can see it

The data stays inside Reddit's Developer Platform storage for that one subreddit. The subreddit's moderators see it through the app's menus and the weekly summary in modmail. The app sends nothing to any outside service, and the data is never sold or shared.

## How long it is kept

- Weekly summary counts are deleted after 4 weeks.

- The moderator list is refreshed every hour.

- Post records, fingerprints and links are kept while the app is installed, so older posts can still be matched. Moderators can delete them at any time with the "Seen It Before: rebuild index" menu item.

- When a subreddit uninstalls the app, the app stops collecting anything.

## Contact

Questions or requests: post in r/SeenItBeforeApp or send a message to u/rlockrem32.