Find Reddit posts to reply to while the thread is young
Reply Radar is a Reddit tool for finding fresh posts worth answering in communities you already care about. Pick up to 30 subreddits or a saved audience, and it lists posts from the last 6 hours, each matched to the closest past topic on Reddit and paired with the replies people upvoted on similar past posts. It never writes the reply.
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- 6 hoursAge limit for a post in the feed, counted from when it went up on Reddit
- 30Subreddits read in one run, named one by one or taken from a saved audience
- 5.6% vs 0.8%Plain top-level replies that reached 5+ upvotes: posted within 30 minutes vs 6 to 24 hours later
What happens to a reply, by timing and by links
Measured on 1,146,226 visible replies by people other than the post author in 12 founder and marketing subreddits. These numbers back both the 6-hour limit and the advice to leave links out.
- Top-level reply within 30 minutes of the post
- 5.6% reached 5+ upvotes
- Top-level reply 3 to 6 hours later
- 2.8%
- Top-level reply 6 to 24 hours later
- 0.8%
- Reply with an outside link
- 0.48% vs 1.84% for comparable replies without one
- Own product named, no link
- 1.91% vs 2.03% for comparable replies
- Question posts with no answer (moderator and bot replies aside)
- 28.6% of 68,152
What Reply Radar does
Watchlist
Point it at saved audiences or at subreddits you name, one or the other, so the source of every post stays clear. An audience larger than 30 subreddits is read up to its first 30.
Fresh posts
Each post from the last 6 hours is compared with the closest past topic on Reddit and marked strong, good or weak. A post is listed only when that topic has replies people upvoted. Filter by age and match, sort best first or newest.
Similar posts & top replies
Every listed post opens on its own page with past posts from the matched topic and up to 10 replies people upvoted most there: material for deciding what to say, not a script to paste.
Copy all for AI and Reply on Reddit
Copy all for AI copies the post and its context for your own assistant. Reply on Reddit takes you to the thread itself, where the words are yours.
Saved and Recent sessions
Star a watchlist to keep it with its filters and order. Recent sessions lists your project's latest runs, and Continue picks one up again without starting a new run.
Reads only while you look
The feed refreshes every 2 minutes while the page is open, pauses when the tab is hidden and stops after 15 minutes without activity until you resume.
How Reply Radar works
Choose the communities
Pick a saved audience, or type the subreddits where your buyers ask their questions.
Scan what just went up
Narrow the feed by age and match strength, and open the posts worth your next ten minutes.
Answer in your own words
Read the replies that community upvoted on similar posts, then reply on Reddit yourself, early and without a link.
Who uses Reply Radar
Founders doing their own Reddit marketing
Marketers who reply under their own name
Community managers and DevRel
What Reply Radar doesn't do
Here is what it won't do, so you know before you start.
- No keyword or brand search: it reads the subreddits or audience you choose, not all of Reddit for a word.
- No email, Slack or push alerts, and nothing is read after you close the page.
- It doesn't write, suggest or post replies, and it sends no messages.
- Subreddit rules, karma and account-age requirements and removal risk aren't on the post card; check them in Subreddits.
- No promise of leads: a post shows up because it is fresh and close to a topic with upvoted replies, not because its author wants to buy.
Reply Radar: common questions
How do I find Reddit posts to reply to?
Pick the subreddits where your buyers ask questions and check them while posts are young. Reply Radar lists posts from the last 6 hours in up to 30 subreddits you choose, each with the replies people upvoted on similar posts in the past.
How soon should I reply to a Reddit post?
As early as you can. Across 12 founder and marketing subreddits from January to September 2026, plain top-level replies posted within 30 minutes reached 5+ upvotes 5.6% of the time; after 6 to 24 hours, 0.8%.
Should I put a link in my Reddit reply?
Our numbers say no. Replies with an outside link reached 5+ upvotes 0.48% of the time, against 1.84% for comparable replies without one, while naming your product without a link barely changed the odds (1.91% vs 2.03%).
Does Reply Radar monitor Reddit for my keywords?
No. It has no keyword search: it reads the subreddits or audience you pick, and only while the Reply Radar page is open in your browser.
Does Reply Radar write replies for me?
No. It shows the post and the replies that community upvoted on similar posts, as material for your own judgement; whether you reply, and what you say, is up to you.
Is Reply Radar a Reddit lead generation tool?
Not in the usual sense: it doesn't hunt for buying intent, send messages or promise leads. It shows fresh posts in communities you chose and the evidence of which replies worked there.
Is Reply Radar included in my plan?
Yes. Reply Radar is in every KissMyPost plan with no separate price; what changes between plans is the number of kisses, our credits. Try any plan for a day before choosing.
Try Reply Radar on any plan.
Fresh posts from subreddits you pick, each paired with the replies that community upvoted on similar posts.