reddit.com
In short: Reddit (reddit.com) accepts community post/comment. It is free to submit, takes a moderate amount of preparation, and scores 66/100 on our impact ranking (useful).
Post to relevant subs with context: SideProject, SaaS, webdev.
Respect subreddit rules; 90/10 self-promo; no spam/comments.
Priority is medium, which sets the band. It is free and moderate to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.