Subreddit Activity
Checker.
Enter a Reddit username and a subreddit to check whether that user has ever commented there. Powered by 30B+ archived Reddit data points.
Frequently asked questions
How do I check if a Reddit user is active in a subreddit?
Enter the username and the subreddit name above. The tool scans the user's archived comment history from the THINKPOL 30 billion post archive and returns matching comments with dates and samples, covering up to 1,000 of the most recent archived comments.
Does the activity check include deleted comments?
Yes. The archive preserves comments as they were captured, so activity is detected even if the user later deleted their comments or the subreddit removed them. To retrieve the content of specific removed items, use the deleted Reddit posts tool.
Will the user know their activity was checked?
No. Checks run entirely against THINKPOL's EU-hosted, GDPR-compliant archive and never touch Reddit's servers, so no notification is generated. No Reddit account or signup is required.
What is a Reddit activity check used for?
Common uses include identity verification, moderation vetting, fraud investigations, and OSINT research. The same check is available programmatically through the THINKPOL API with sub-300ms response times; the free tool is rate-limited.
THINKPOL is an independent intelligence platform and is not affiliated with, endorsed by, or sponsored by Reddit Inc. "Reddit" is a registered trademark of Reddit Inc. Use is subject to our Terms of Service and Privacy Policy.