This tool runs nine checks on a Reddit reply before you post it: length, formatting, greeting, where the product mention sits, founder disclosure, links, price talk, product numbers, and whether the writing sounds like a person wrote it. It reads the subreddit's own audited rules, so a mention that would get removed in a banned community gets flagged before you paste it there. It cannot tell you if your answer is good, and it cannot check your claims against your product's real facts, that part only happens inside Radar itself.
How to use it
- Subreddit. Type the name without r/. The checker grades your product mention and your links against that subreddit's audited promo verdict: allowed, restricted, banned, or unknown. Around a thousand communities already have a verdict on file, so most subreddits answer instantly. If you're not sure what a subreddit allows, run it through the subreddit rules checker first. An unaudited community comes back as unknown, and the page will tell you to audit it before you rely on the result.
- Product name. This is what the tool looks for inside your draft, to find the mention and check where it sits. Use the same spelling and capitalization you wrote in the reply, or it won't match.
- Product URL. Used for the link check, to see whether any URL in your draft points to your own site, and whether it shows up more than once.
- Draft reply. Paste the plain text you're about to post, no markdown, no formatting. Click Check. You'll get a headline, passes, passes with a number of warnings, or a count of things that would get it rewritten, and the nine checks underneath, each marked pass, warn, or fail with a one-line reason.
The nine checks, and what each one catches
Each check below runs independently and shows pass, warn, or fail with one line explaining why. A fail means the draft would likely get the comment removed or the account flagged, a warn means it reads as slightly off even where the rules technically allow it.
Length
A wall of text gets skipped, and a one-liner reads like it was dropped without reading the post. The band here is 40 to 150 words, wide enough for a short answer or a fuller one. Go outside that band by up to a quarter and the check warns; go further and it fails, because a reply that short or that long stops reading like a normal comment. Fix: cut filler sentences, or add one more concrete detail rather than padding with adjectives.
Plain text
Reddit renders markdown, but people typing a normal reply don't write in bullets and headings. Lists, bold text, headers, and em dashes are the tells of something pasted straight out of a chat window, and they read as promotional even when the content underneath is useful. This check fails on any of them: bullet points, headings, bold markup, em dashes. Fix: rewrite as plain sentences, and swap any em dash for a period or a comma.
No greeting
"Hey u/throwaway123" or "Hi there!" at the top of a reply is something real commenters almost never do, people just answer the question. It's a small tell, but a moderator who reads a lot of self-promotional comments learns to spot it fast. This check fails if the draft opens by addressing the poster by name or with a generic greeting. Fix: delete the greeting and start with the answer itself.
Product mention
Most subreddits don't ban helping people, they ban leading with a pitch. If the subreddit's audited verdict is banned, naming the product at all is a fail, the reply has to help without naming anything. Everywhere else, the mention has to land in the final third of the reply, after the actual answer, not before it. A mention in the first half fails even in a community that otherwise allows promotion, because it reads as an ad with a helpful answer bolted on, not the other way round. Across the subreddits with a verdict on file, banned outnumbers restricted and allowed combined, so this check fails more drafts than it passes, and that's by design. Fix: move the answer first, the mention last, once, in one sentence.
Founder disclosure
A reply that names a product without saying who's behind it reads as an unaffiliated recommendation, and that's the exact pattern moderators are trained to remove, sometimes with an automatic ban. It's also the pattern that gets accounts banned outright rather than just having a comment removed, because it looks deliberate rather than careless. This check fails if the draft names the product without disclosing you made it, or if it poses as a happy customer rather than the person who built it. Fix: add one plain disclosure sentence. "Full disclosure, I built this" is enough, it doesn't need to be longer than that.
Links
Whether a link is allowed follows the subreddit's own verdict. In a banned community it's a fail outright. In a restricted one it's a warn, because the rule usually comes with a condition a bare link on its own doesn't satisfy, a designated thread or day, a participation ratio, a required flair, mod approval asked for in advance. It also warns if the link points to a different domain than the product URL you entered, or if the draft has more than one link. Fix: drop the link where it's banned, and where it's allowed keep it to one bare URL, inside the disclosure sentence.
No price talk
A number attached to a price is the fastest way to turn a helpful answer into an ad, and it's the kind of detail that's easy to get wrong or out of date the moment it's typed into a Reddit thread, a plan that gets renamed or repriced next quarter leaves the comment stuck with the old figure forever. This check fails on any price, plan name, or trial length mentioned anywhere in the draft. Fix: cut the number. Let people find pricing on your site if they click through.
Numbers about the product
Any other figure, a percentage, a count, a speed claim, attached to a sentence that names the product gets a warning. Numbers are exactly where drafts go wrong: a stat that sounds right but isn't backed by anything you can point to reads as invented the moment someone checks it. Fix: only use a number here if that exact figure is written on your own site somewhere.
Reads like a person
A reply that describes itself, "this reply was drafted with AI," "as an AI assistant," fails outright. That kind of self-reference doesn't belong in a Reddit comment from a person, and it reads as an admission the moment anyone notices it. Stock generated phrasing, "I hope this helps," "let me know if you have questions," gets a warning instead. Nothing in the rules bans that phrasing, but readers and moderators both recognize it on sight, the same way a form letter reads different from a note from a friend. Fix: cut the self-reference, and reread the closing line for anything that sounds like a template.
Before and after
Someone posts asking how to get freelance clients to pay on time. Here's a draft that would get flagged, and the version that wouldn't.
Hey! I've been using an invoicing app for exactly this, it's $15 a month and it's the easiest way to deal with late-paying clients. Been using it for two years now and it's never let me down. As for your actual question, just send a reminder a week after the due date and add a small late fee, that usually gets people moving.
This fails on greeting, mention up top before any answer, a price, and posing as a happy user instead of disclosing who built it.
Late payments are usually friction, not refusal. Send the reminder the day it's due, not a week later, most people have just forgotten. Put a specific late fee in the invoice terms from the start so it isn't a surprise when you enforce it, and make paying as easy as you can, a direct payment link beats a mailed invoice every time. If a client goes quiet past thirty days, a short call works better than another email chasing them. Full disclosure, I built an invoicing app that automates the reminders and the fee, this is the exact workflow it runs.
Same question, help first, the mention held until the final third, and a plain disclosure sentence instead of a fake recommendation.
The one check this page cannot run
Every check above runs on the text you paste, nothing else. What it can't do is check whether what you claim about your product is true. Inside Radar, every sentence that names the product has to share vocabulary with the product facts read off your own site, and any number in those sentences has to appear word for word in those facts. That's what catches a draft that says "used by thousands of freelancers" when your site never said that, or a figure quietly rounded up from what you published.
This matters because a mismatched claim is worse than no claim at all. A moderator or a skeptical commenter who checks your site and finds a different number reads the whole reply as dishonest, not just the one line. Inside Radar, a draft that fails this check doesn't just get flagged, the reason gets fed back to the model and the reply is rewritten before the founder ever sees it. This page reads your draft in isolation, so that fact check against your real site only happens when you draft a reply inside Radar itself, not when you paste a draft here that you wrote by hand.
Founder disclosure wording that reads naturally
- Full disclosure, I built this.
- I'm the person behind [product], so keep that in mind reading this.
- Disclosure: I made the thing I'm about to mention.
- I built [product] after running into this exact problem myself.
- Should say upfront, I'm the founder of [product].
What this tool does not do
- No model runs here. Every check uses plain rules against the text you paste, nothing gets sent to an AI to judge, which is also why the results come back instantly.
- Nothing you type gets saved anywhere. Your subreddit, product name, URL, and draft vanish once you close the page, no login, no history to look back at later.
- Passing all nine checks means the reply follows the shape of something that wouldn't get removed for self-promotion, not that it's a useful answer to the question that was asked.
- You paste the reply, not the post it's answering, so the check has no way to know whether your answer addresses what was asked, only whether the reply itself is shaped right.
- Checking a draft here changes nothing on Reddit. You still copy, paste, and post it yourself, under your own account, in your own browser.
Why these checks exist
I got a 28-day ban from r/SaaS, then a permanent one from r/startups on 4 September 2026, both for replies I thought were helpful and that still broke a rule I hadn't read closely enough. These nine checks exist because of what got me removed, not because they're general writing advice. They're the specific things that trigger moderation: where the mention sits, whether you disclosed, whether there's a price or a link where one isn't allowed.
It's also why nothing here posts on your behalf. Radar drafts a reply, runs it through a validator that rejects and rewrites anything that breaks these same rules, and then hands it to me to read, edit, copy, and paste under my own username. Nothing is ever auto-posted. Inside the product, that rule goes further than a single reply: one product mention per subreddit per run, then a cooldown of a week after a mention goes out, and by that math roughly half of what Radar drafts never pitches the product at all, it's just a helpful answer with nothing attached. This free page is the same set of checks that sit behind that discipline, open to anyone, on whatever you paste in. If you want the fuller picture of how a thread gets judged worth replying to in the first place, that's in how Radar decides a thread is worth a reply, and the rules behind most of these checks are laid out in Reddit's actual self-promotion rules.
If you haven't found the subreddits where your product fits yet, run your site through find my subreddits, or Scan my site free for the fuller version, communities, live threads, and a reply ready to copy.
FAQ
Does this tool post my reply to Reddit?
No. It only checks the text you paste. You still copy your reply, open Reddit yourself, and post it under your own account. Nothing on this page ever touches your Reddit login, and it never asks for one.
Does it check whether my product claims are actually true?
No, that's the one check it can't run from a standalone page. Matching your claims against your product's real facts, word for word, happens inside Radar when you draft a reply there, not here. This page only checks the shape of the text, not whether the sentences are accurate.
What happens if I check a subreddit that hasn't been audited yet?
It comes back as unknown, and the product mention and link checks can't grade against a real verdict, so you won't get a reliable answer on whether a mention is allowed. Run it through the subreddit rules checker first so you know whether the community allows a mention at all before you rely on this one.
Is my draft or my product information stored anywhere?
No. Nothing you type into this page is saved anywhere. Each check runs on the text you pasted and nothing else, and it's gone the moment you close the tab.
What counts as sounding like it wasn't written by a person?
Any line that describes itself, phrases like "this was drafted by AI" or "as an AI assistant," fails outright. Stock closing lines like "I hope this helps" get a warning instead, because they read as generated even when a real person typed them, they're just phrases people reach for without thinking.
Can I use this to check a reply for a subreddit where I've been banned before?
Yes, the checks run the same regardless of your posting history. What it can't tell you is whether a subreddit's mods remember you specifically, only what the current rules and your draft say. If you want to check your account's own history first, the account checker shows your karma and activity the way a moderator would see it before they click through.