Created by the #1 outbound sales agency

Get message-market-fit in days not months

StackSplit is trained on 4M+ winning cold emails. Tell it your offer and audience, and it generates angles likely to get replies, tests them inside your sending tool and reveals your winners.

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Finally... you don’t have to waste leads to figure out what gets replies

The Hard Way (Manual message testing)

Writing every variation from scratch

Spending weeks researching what your market will respond to

Burning leads before you know what works

Rewriting the same angle over and over, hoping it clicks

Taking months to find messaging that converts

Easy Way: StackSplit finds the winners

Get angles already tested across 4M+ emails

Research already done - StackSplit shows what your buyers want

Every lead gets a proven-to-work message

Get fresh variations across signals, tones, angles and personas

Winning messages found in days

Test based on what’s already working

Use data from 4M+ winning emails

Skip the guesswork. StackSplit generates messages tailored to your offer using patterns that got thousands of replies.

Get 100s of angles without writing one

StackSplit combines product, persona, signal and tone to create tons of ready-to-test angles in just a few clicks.

Deploy and scale the winners

Push your messages straight into your sending tool, launch sequences, and start testing. StackSplit tracks performance and shows you exactly what wins.