Which subreddits allow self-promotion

Every room, sorted most open first

Each answer rests on the room's own rules where they say anything about promotion, as a public mirror captured them; then on removals we counted; then on our inference. Open a room for its quoted rules, the capture date, and what to do instead.

Not listed? The free subreddit promotion checkerreads any room. Rules change, so check a room's live rules page before you post.

Questions

Which subreddits allow self-promotion?

Of the 58 subreddits we read, 3 allow posting your own work by their own rules (r/AlphaAndBetaUsers, r/IMadeThis, r/SideProject), 33 allow it only under conditions, 22 ban it. Commenting is open in 45 of the 58.

Which subreddits can I promote my SaaS in?

Post your product only where the rules invite it or name a thread for it. 14 rooms here name one, including r/AmazonSeller (Community Promotional Post), r/content_marketing (stickied Check Out My Blog Post thread), r/cscareerquestions (monthly stickied threads), r/Entrepreneur (Thank You Thursday threads), r/Etsy (stickied Critique and Share Your Stuff threads), r/EtsySellers (stickied promotion post). Everywhere else, answer the questions people ask in the room and mention your product only when it answers one.

How can I check if a subreddit allows self-promotion before posting?

Read its rules list and sidebar, not just the rule titles: most rooms that ban promotion still name a weekly thread or allow a relevant mention in a reply. This table quotes each room's own sentence with the date it was captured, and the free subreddit promotion checker reads any room not listed here.