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AI-powered social listening that finds high-intent buyers on Reddit, HN, X & Bluesky
Which is more popular?
Based on our record, Submit.co seems to be more popular. It has been mentioned 3 times since March 2021.
Website, pricing, platforms and company facts side by side.
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Submit.co
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|---|---|---|
| Website | submit.co | replygain.com |
| Pricing | — | |
| Company | — | 2025 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of Submit.co yet.
ReplyGain is an AI-powered social listening tool built for SaaS founders and indie hackers. It scans Reddit, Hacker News, X (Twitter), and Bluesky to find posts where someone is actively asking for a product like yours. Instead of spending 3 hours/day scrolling Reddit, ReplyGain delivers ~50...
What each product offers, as listed by its team.

Possible disadvantages
How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing Submit.co and ReplyGain.
ReplyGain's answer:
ReplyGain is the only social listening tool purpose-built for indie hackers and SaaS founders. Instead of tracking brand mentions like legacy tools, it finds posts where someone is actively asking for a product like yours, across Reddit, Hacker News, X, and Bluesky. Every lead gets an AI intent score (0-100), and you can generate natural-sounding replies with one click. Paste your URL and AI auto-generates keywords and subreddits to monitor, zero manual setup
ReplyGain's answer:
Traditional social listening tools like Brand24 and Mention are built for enterprise brand monitoring, tracking who talks about you. ReplyGain flips that: it finds people already asking for what you built, even if they've never heard of you. It's built for founders, not marketing teams. The AI generates replies (not corporate-sounding AI slop), and pricing starts at $29/mo vs $100+/mo for competitors. Plus it covers Hacker News and Bluesky, which most competitors ignore entirely.
ReplyGain's answer:
Indie hackers with SaaS products, startup founders (pre-Series A), solo founders managing multiple products, small agencies with 3-10 clients, and freelancers like SEO experts or designers. Anyone who needs to find potential customers on social platforms but doesn't have time to scroll Reddit for 3 hours a day.
ReplyGain's answer:
ReplyGain was born from a founder's frustration with manually searching Reddit every day for potential customers. Scrolling through thousands of posts, most irrelevant, hoping to find the one person asking for exactly what you built, a 3-hour daily time sink. So we built an AI that does it in minutes: scans multiple platforms, scores posts for buying intent, and generates replies that actually sound human. What used to take 90 hours/month now takes 5.
ReplyGain's answer:
ReplyGain primarily serves indie hackers and small SaaS founders. Our users include:
Solo founders building their first product Bootstrapped SaaS teams doing organic marketing Freelance marketers managing client lead generation Small agencies monitoring Reddit and HN for multiple clients
Share your experience with using Submit.co and ReplyGain. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Fun story: I built BetaList 16 years ago which was one of the first "product discovery" platforms. Years before Product Hunt, etc. I manually reviewed every submission and unfortunately often I had to tell founders that their startup... - Source: Hacker News / 4 months ago
First, I crawled and audited all the available data from similar lists. Startup directories, such as those found on GitHub and Submit.co websites are the few standing out in terms of quality. - Source: dev.to / almost 4 years ago
Very cool. Just submitted to submit.co. Source: over 5 years ago
Tracking ReplyGain since Jul 2026.
When comparing Submit.co and ReplyGain, you can also consider the following products.


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Social Cue finds the Reddit, HN, and X conversations worth joining for your brands - scored, with replies drafted in your voice, on the Claude subscription you already have.
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