Reddit Post Profiler

Paste a link to a Reddit post. For everyone who commented, see how active they were in that subreddit before the post, and where else they post and comment.

Options
The post's own subreddit is always included. The archive box adds every subreddit the archive covers when the scan starts; Arctic Shift answers for what it doesn't.
Counted back from the post.
0 = don't save (scans too).

AutoModerator and deleted accounts are always skipped. A commenter usually takes 1 request to the free Arctic Shift API, 2–3 if they'd been active in the post's subreddit before the post and it has no archive files, and none when saved results can be reused. Threads with more than 300 commenters ask before profiling them all. If Arctic Shift rate-limits, every request pauses; if it asks us to slow down, fewer requests run at once.

Badges (activity in the post's subreddit before the post)
occasional at least posts + comments, on or more different days, the first or more days before the post
regular at least posts + comments, on or more different days, the first or more days before the post
Everyone else is new here. 0 turns a check off. Changes apply straight away, to saved scans too.
Scheduler

Scans run one after another, each with the options set when it was added. You can switch to other tabs or windows while it runs, but keep this tab open; if it's closed, the queue is kept and picks up again when you press Start queue. Finished scans are listed under Saved scans. To go easy on the free API, the queue holds up to 25 scans, profiles 2 users at a time, and profiles only the 300 most active commenters of a bigger thread unless “Only the N most active commenters” was set.

    Saved scans

    Scans you've run in this browser. Open one to see its users again straight away, with no requests; Scan again checks the thread for new commenters and reuses saved results for the rest.

    About and responsible use

    Everything shown is public Reddit activity, archived by Arctic Shift, a free archive run by a volunteer. This page only counts that activity. Your scans go straight from your browser to Arctic Shift and to the project's file host on Cloudflare, which lists the subreddits with archive files and serves those files; results are kept only in your browser.

    • Use it to understand a discussion, such as whether a thread's commenters are regulars in the subreddit. Don't use it to single out, harass or brigade people, and remember a count isn't the whole story about anyone.
    • Counts can be incomplete: the archive can miss posts and comments, and anything removed before it was archived isn't there. Deleted accounts and AutoModerator are skipped.
    • Go easy on the API. It's shared by everyone who uses it, so profile the most active commenters where that's enough and avoid scanning the same thread over and over. Saved results are reused for 7 days by default.
    • Want your data removed? Arctic Shift takes removal requests. Once your data is removed there, this tool can't see it either.