A/B testing for cold email, done honestly

Your winning subject line probably won by luck.

4 replies vs 6 replies isn't a test result — it's a coin flip. Variantt connects to your sequencer, tells you which A/B tests were statistically real, and uses AI to read your copy and suggest what to test next.

Verdict · Real winner

B: "quick question about {{company}}'s outbound"

vs A: "Improve your reply rates with AI"

2,847 sends each · A: 1.9% replies · B: 3.4% replies

96% probability B is genuinely better. Roll it out.

AI · next test Personalized, lowercase subjects are working for you. Test B against a one-word subject ("outbound?") to see how far the casual angle goes.
Verdict · Statistical noise

B: "Re: partnership"

vs A: "Partnership with {{company}}"

142 sends each · A: 2.8% replies · B: 4.2% replies

This test can't tell you anything yet. You'd need ~1,900 more sends per variant to call it.

AI · heads up "Re:" subjects fake a prior thread — they lift opens short-term but tank trust and hurt domain reputation. Test honest urgency instead.

From "I think B won" to knowing.

No new sending tool. No workflow change. Variantt reads the campaigns you already run.

01

Connect your sequencer

Smartlead, Instantly, Lemlist, Apollo — one click, read-only. Your sending stays where it is.

02

We pull every test

Campaigns, variants, copy, sends, replies — your full testing history, past and present.

03

Get the honest verdict

Real winner, noise, or "keep sending" — with the probability and sample size to back it.

04

AI plans your next test

It reads what won and what flopped in your actual copy, then tells you what to test next and why.

Free to start. Fair when you scale.

Variantt launches with a free plan — and waitlist members lock in a founding-member discount on Pro.

Free

$0 · forever

  • 1 sequencer connection
  • Honest verdicts on your active tests
  • Sample size & "keep sending" guidance
Early access discount

Pro

Founding-member pricing for the waitlist

  • Unlimited connections & workspaces
  • AI next-test suggestions on every campaign
  • Full testing history, analyzed retroactively
  • Client-ready reports for agencies

Stop shipping coin flips.

Join the waitlist — be first in, lock in the discount, and let the ants find your real winners.