Product Launch A/B Test
Stat sig320K+ total sends (160K per variation)
| Metric | Control | MailTail | Lift |
|---|---|---|---|
| Open Rate | 24.18% | 59.83% | +147% |
| Click Rate | 0.10% | 0.19% | +90% |
WINNERMAILTAIL
All case studies
G FUEL raced every flow against the original.
The Official Energy Drink of Esports increased cart abandonment revenue by 435% with MailTail.
- 125Countries
- 1B+Social Followers
- 100M+Emails Tested
Gaming & energy drinks
Revenue (Cart Abandonment)
Open Rate (Product Launch)+147%
Statistical Significance100%
Klaviyo A/B split tests, September 2025 - January 2026
The Promotions tab was killing revenue
G FUEL's emails landed in Gmail's Promotions tab—buried with hundreds of other marketing emails. For limited-edition flavor drops that sell out in hours, invisibility meant lost sales.
- 24.2%Open rate on product launches
- ~31%Open rate on cart abandonment
- LowRevenue per abandonment flow
Unique code that Gmail can't pattern-match
MailTail generates completely unique code for each merchant. Not identical snippets copied across clients—actual unique variations Gmail can't detect and auto-flag as promotional.
- Every merchant gets unique code variations
- No detectable patterns across domains
- Works alongside existing email fundamentals
- Set up with you within 12 hours
The time slips.
Every flow tested. Every flow improved. Real Klaviyo data.
Product Launch Campaign
Highest volume test
Welcome Flow
First impression
Welcome Email A/B Test
1.4K total sends
| Metric | Control | MailTail | Lift |
|---|---|---|---|
| Open Rate | 34.26% | 44.30% | +29% |
| Click Rate | 2.78% | 3.53% | +27% |
| Revenue | - | - | +91% |
WINNERMAILTAIL
Cart Abandonment Flows
High-intent buyers
Cart Abandonment Test #1
7.2K total sends
| Metric | Control | MailTail | Lift |
|---|---|---|---|
| Open Rate | 30.63% | 43.85% | +43% |
| Click Rate | 1.08% | 1.71% | +58% |
| Revenue | - | - | +1,531% |
WINNERMAILTAIL
Cart Abandonment Test #2
4.9K total sends
| Metric | Control | MailTail | Lift |
|---|---|---|---|
| Open Rate | 30.39% | 43.62% | +44% |
| Click Rate | 1.13% | 1.81% | +60% |
| Revenue | - | - | +1,140% |
WINNERMAILTAIL
Cart Abandonment Test #3
4.5K total sends
| Metric | Control | MailTail | Lift |
|---|---|---|---|
| Open Rate | 32.66% | 49.87% | +53% |
| Click Rate | 1.87% | 3.13% | +67% |
| Revenue | - | - | +435% |
WINNERMAILTAIL
Cart Abandonment Test #4
259 total sends
| Metric | Control | MailTail | Lift |
|---|---|---|---|
| Open Rate | 26.19% | 54.86% | +110% |
| Click Rate | 0.00% | 4.00% | - |
| Revenue | $0 | >$0 | - |
WINNERMAILTAIL
Checkout Abandonment Flows
Highest intent
Checkout Abandonment Test #1
1.1K total sends
| Metric | Control | MailTail | Lift |
|---|---|---|---|
| Open Rate | 31.85% | 48.57% | +53% |
| Click Rate | 1.03% | 1.98% | +92% |
| Revenue | - | - | +1,053% |
WINNERMAILTAIL
Checkout Abandonment Test #2
147 total sends
| Metric | Control | MailTail | Lift |
|---|---|---|---|
| Open Rate | 27.45% | 45.83% | +67% |
| Click Rate | 0.00% | 4.17% | - |
| Revenue | - | - | +596% |
WINNERMAILTAIL
Browse Abandonment Flows
Show 2 tests
Browse Abandonment Flows
Browse Abandonment Test #1
4.7K total sends
| Metric | Control | MailTail | Lift |
|---|---|---|---|
| Open Rate | 47.10% | 48.01% | +2% |
| Click Rate | 0.60% | 1.41% | +135% |
| Revenue | - | - | +95% |
WINNERMAILTAIL
Browse Abandonment Test #2
237 total sends
| Metric | Control | MailTail | Lift |
|---|---|---|---|
| Open Rate | 34.25% | 45.12% | +32% |
| Click Rate | 1.37% | 4.27% | +212% |
WINNERMAILTAIL
Campaign-Level Impact
Comparing similar promotional campaigns with and without MailTail
BOGO Campaign Comparison
Similar promotional campaigns, one with MailTail, one without
| Metric | Without | With MailTail | Lift |
|---|---|---|---|
| Open Rate | 31.69% | 54.14% | +71% |
| Click Rate | 0.69% | 1.21% | +75% |
| Order Rate | 0.12% | 0.23% | +92% |
| Revenue/Recipient | $0.09 | $0.16 | +78% |
+48%total revenue lift from a single campaign
How it was measured.
All data from Klaviyo A/B split tests conducted September 2025 - January 2026. Control groups received standard emails without MailTail. Test groups received MailTail-optimized emails. Results may vary based on industry, list quality, and email practices.
The bottom line.
Consistent improvements across every email type tested
- Avg. Open Rate Lift+58%
- Avg. Click Rate Lift+93%
- Campaign Revenue Lift+48%
- Emails Tested100M+
Highest gains came from cart and checkout abandonment—the customers closest to buying saw the biggest lift.
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