Caius Seemann
Apex Overlay
Cold email campaigns split sends equally — your best email gets the same volume as your worst.
Apex Overlay fixes that. It connects to Instantly.ai and continuously increases send probability toward whichever email is getting real replies, starting from day one.
No waiting for A/B test results, no manual switching. The system updates in real time with every reply, click, and open — filtering out bot activity so decisions are based on real human engagement.
First beta campaign saw 96% of sends on the winning email by day 12, 14% more replies on day one. Free for 3 months, no card needed.
- Apex Overlay
Automated Email A/B Testing
How Slow A/B Testing Costs You 18–32% of Potential Replies
I've been running cold email campaigns since I was 16. One thing always bugged me: you set up 3 email versions, one of them is clearly better, and your sending tool just... keeps splitting equally across all three. By the time you check and manually kill the loser, hundreds of leads have already seen your worst copy.
So I decided to quantify how expensive that actually is.