What Is SignalPlay?
SignalPlay is our custom-built Reddit Autocomment Engine — a fully automated workflow that monitors Reddit conversations in real time, filters for high-intent posts, uses GPT-4o to craft human-like replies, and publishes them instantly.
It started as a weekend experiment using n8n, Supabase and GPT, and quickly became one of our highest-performing inbound growth channels.
Today, over 20 people contact us daily after seeing our helpful replies on Reddit.
All without ads. Without links. Without sounding like salespeople.
How the Automation Works (Step-by-Step)
1. Trigger & Post Discovery
The workflow runs every few minutes and scrapes fresh posts from subreddits like:
- r/LeadGeneration
- r/SaaS
- r/Entrepreneur
- r/startups
It looks for hot posts containing keywords like:
- "lead gen tool"
- "replace Clay"
- "cold outreach problem"
2. Deduplication with Supabase
Each post is checked against Supabase. If it's already been processed, the workflow skips it.
3. Quality Filter
Only posts that meet these conditions are considered:
- More than 2 upvotes
- Text content is present
- Created within the last 6 months
4. GPT Screening – Step 1
GPT-4o analyzes the post and answers:
"Is this a real business pain point related to sales, lead gen, or B2B growth?"
Only posts with a "yes" continue.
5. Key Data Extraction
We extract all relevant metadata: post text, upvotes, subreddit size, creation date, and direct link.
6. GPT Comment Creation – Step 2
A second GPT prompt generates a natural, empathetic reply — never salesy, never spammy.
Example comment:
"Had the same problem recently. Ended up testing a signal-based tool that tracked funding and hiring. Let me know if you want to see what worked for us — happy to share."
7. Comment Is Posted
The reply is posted automatically to the original Reddit thread — no links, no hard CTA.
8. Logging + Human-like Wait
- The post is logged to Supabase
- The system waits 60–300 seconds before processing the next post (to mimic real behavior)
Get the Complete n8n Workflow
Download the full SignalPlay automation workflow and import it directly into your n8n instance. Includes all 8 steps, GPT prompts, and Supabase integration.
Download n8n Workflow (JSON)Free • Ready to import • No signup required
What you'll need to run this workflow:
- ✓n8n instance (self-hosted or cloud)
- ✓OpenAI API key (for GPT-4o)
- ✓Supabase account (free tier works)
- ✓Reddit API credentials (free developer account)
Built-In Safeguards
✓ Double filtering (logic + GPT)
✓ History tracking via Supabase
✓ Randomized delays
✓ Human-style tone + prompt design
Best Use Cases
- •Startup or side project promotion
- •Silent market validation
- •Community-based lead generation
- •Early traction without paid ads
Why Reddit Works for B2B Leads
Reddit is one of the most underrated lead generation platforms.
Here's why:
- 1.8B monthly visits
- 430M active users, many in professional roles
- 78% make purchasing decisions at work (Reddit Internal Data)
- 100,000+ active communities across SaaS, AI, logistics, fintech, HR, and more
The Real Power of Reddit
Reddit is where:
- Buyers ask for help before Googling
- Founders share unfiltered pain points
- Marketers, consultants, and PMs post real problems, looking for advice
These are live buying signals — if you intercept them in the right way, they become warm leads.
Real Example
Post on r/Entrepreneur:
"Struggling to get traction for our B2B SaaS. Anyone found a good lead gen strategy?"
✓You reply with empathy
✓You share your experience (not your pitch)
✓They check your profile → land on Karhuno → book a demo
This is not advertising. It's smart presence.