Powerful Features
Everything you need to create successful campaigns and grow your business.
Multi-Variant Testing
Test up to 5 different versions simultaneously to find the best performer.
Test Everything
Subject lines, preview text, content, images, CTAs, send times, and more.
Statistical Significance
Get results you can trust with proper statistical analysis and confidence levels.
AI Recommendations
Get AI-native suggestions for what to test based on your past performance.
Automatic Winner
Automatically send the winning version to the rest of your list.
Test Duration Control
Set custom test durations or let the system determine when results are significant.
Sample Size Calculator
Determine the optimal test sample size for statistically valid results.
Detailed Reports
Comprehensive reports showing performance metrics for each variant.
Test History
Track all your tests over time and build on winning insights.
Why Choose sendifai?
How It Works
Get started in minutes with our simple setup process.
Create Variants
Create 2-5 versions of your email with different elements to test.
Define Test
Choose your sample size, duration, and winning criteria.
Review & Win
Analyze results and automatically send the winner to remaining subscribers.
Frequently Asked Questions
How many variants can I test?+
You can test up to 5 variants simultaneously. This allows you to test multiple ideas in a single campaign.
What can I A/B test?+
You can test subject lines, preview text, from name, email content, images, CTAs, send times, and any other element of your campaign.
How do you determine the winner?+
You choose the winning metric (opens, clicks, or conversions). We use statistical analysis to determine when a winner can be declared with confidence.
What is the minimum sample size?+
We recommend at least 1,000 subscribers per variant for reliable results, but our calculator will help you determine the optimal size for your list.