Every tool below monitors: you give it keywords or subreddits and it surfaces matching posts, which assumes you already know which rooms to watch. Kasspian answers the earlier question, which rooms and what to say, and does no monitoring at all. Each page names the case for using them instead, with prices read from their own site.
Kasspian vs
Syften
An AI-filtered keyword monitor. You give it phrases to watch and it alerts you by email, Slack, RSS, webhook or API whenever a matching conversation appears.
Kasspian vs
F5Bot
A keyword alerter. It watches Reddit, Hacker News and Lobsters for your words and emails you within minutes, and it has been free for years.
Kasspian vs
Subreddit Signals
A prioritised Reddit feed. You choose subreddits, it ranks the posts by fit and buyer intent, and it builds a comment draft you edit and post from your own account.
Kasspian vs
OneUp
An agent platform. It scans Reddit for buyers, drafts DMs, replies and articles in your voice, and publishes them, with your approval on every send.