Cold Email A/B Testing, Test Subject Lines & Body Copy
Find the message that converts with cold email A/B testing.
Bulk Email Boxer A/B testing splits your audience across variants and shows you which version performs better.
The problem
Most cold emailers guess at what subject lines and body copy work instead of systematically testing.
The solution
Bulk Email Boxer A/B testing splits your audience across variants and shows you which version performs better.
Everything you need, included
- Test subject lines and body copy per step
- Balanced exposure across active variants
- Per-variant sent and reply rates; opens/clicks when tracking is enabled
- Winner detection after at least 50 sends per variant at 95% confidence
- Up to three variants per sequence step in the editor
- The winning variant becomes active for that step
Simple, flat pricing
Starter: $40/mo · Growth: $90/mo · Scale: $350/mo
All plans include optional warmup controls, sequences, and reply handling. A/B testing is available on Growth and Scale. Seats are capped at 1, 3, or 10 by tier.
How it works
Connect your email account, import contacts, build a sequence, and launch. Warmup controls remain off until you opt in. Replies from connected inboxes appear in your unified inbox.