Understanding which segments of your audience engage most with your email campaigns is critical for improving your email marketing strategy. In this comprehensive guide, we’ll show you exactly how to compare campaign performance across different audience segments in Mailchimp using their latest reporting tools.

Important Change: Comparative Reports Are Being Replaced

If you’re familiar with Mailchimp’s Comparative Reports feature, note that as of March 12, 2026, this tool has been discontinued and replaced with Custom Reports. All saved Comparative Reports have been automatically migrated to the new Custom Reports system, which offers more flexibility and better insights.

The good news? The new Custom Reports tool is actually more powerful and easier to use. Let’s dive into how to use it effectively.

Method 1: Using Custom Reports for Segment Comparison

Custom Reports are Mailchimp’s most powerful reporting tool, available on Standard plans and above. Here’s how to use them to compare campaign performance by segment:

Step 1: Access Custom Reports

• Log into your Mailchimp account
• Click Analytics in the left sidebar
• Select Custom Reports from the dropdown menu
• Click Create Report

Step 2: Configure Your Report Parameters

When setting up your custom report, you’ll need to specify:

1. Report Name: Choose something descriptive like “Q1 2026 Segment Performance” or “Newsletter Engagement by Customer Type”
2. Date Range: Select the time period you want to analyze (last 30 days, last quarter, custom range, etc.)
3. Metrics: Select regular campaigns, automated emails, or both
   • Open Rate: Which segments are most likely to open your emails?
   • Click Rate: Which segments engage by clicking links
   • Click-to-Open Rate (CTOR): Of those who opened, who clicked? This is often more valuable than raw click rate
   • Unsubscribe Rate: Which segments are disengaging
   • Bounce Rate: Data quality by segment
   • Revenue (if e-commerce is connected): Which segments drive the most sales?
4. Audience: Choose which audience to analyze

Step 3: Generate and Analyze Your Report

Once you’ve configured everything:

• Click “Generate Report” or “Run Report”
• Wait for Mailchimp to compile the data (this may take a few moments for large audiences)
• Export the report as a CSV or PDF for deeper analysis or sharing with your team

Method 2: Using Campaign Reports with Segment Filtering

If you don’t have access to Custom Reports (available on Standard and higher plans), you can still compare segment performance on a campaign-by-campaign basis:

• Go to Campaigns in your Mailchimp account
• Click on a specific campaign to view its report
• In the campaign report, look for the “Activity” section
• Use the filtering options to view results for specific segments
• Take note of the performance metrics for each segment
• Manually compare results across segments using a spreadsheet

Note: This method requires more manual work and doesn’t provide automatic side-by-side comparisons, but it’s available on all Mailchimp plans.

Method 3: Audience Dashboard Segment Analysis

For ongoing segment health monitoring, use the Audience Dashboard:

• Navigate to Reports → Audience Dashboard
• Select the audience you want to analyze
• View engagement statistics for each campaign type and/or Source Performance
• Track subscriber growth and decline by segment over time

Best Practices for Segment Comparison

1. Create Meaningful Segments

The quality of your insights depends on how well you segment your audience. Consider segmenting by:

• Purchase behavior (customers vs. non-customers, frequency, recency, monetary value)
• Engagement level (highly engaged, moderately engaged, inactive)
• Demographics (age, location, industry)
• Subscription source (website signup, event, social media, partner)
• Interests or preferences (based on tags, groups, or survey responses)
• Lifecycle stage (new subscriber, active customer, at-risk, churned)

2. Track Trends Over Time, Not Just Single Campaigns

One campaign’s results can be an outlier. Look at segment performance across:

• Multiple campaigns (at least 5-10)
• Different time periods (month-over-month, quarter-over-quarter)
• Various campaign types (promotional, educational, newsletter)

3. Focus on Actionable Metrics

While open rates are useful, they’re less reliable in 2026 due to Apple’s Mail Privacy Protection and other privacy features. Instead, prioritize:

• Click-to-Open Rate (CTOR): More reliable than raw open rate
• Click Rate: Shows true engagement
• Conversion Rate: Tied to your business goals
• Revenue per Email: The ultimate metric for e-commerce

4. Use Segment Insights to Personalize Future Campaigns

Once you identify which segments perform best, take action:

• Send more targeted content to high-performing segments
• Re-engage low-performing segments with different content types or send times
• Adjust send frequency based on segment engagement
• Create segment-specific automations
• Sunset or clean up consistently unengaged segments

What Mailchimp Plan Do You Need?

Here’s what segment comparison features are available on each Mailchimp plan:

• Free Plan: Basic campaign reports only; basic segment filtering per campaign
• Essentials Plan (starts ~$13/month): Campaign reports with segment filtering; A/B testing; automations with up to 4 flow steps
• Standard Plan (starts ~$20/month): Custom Reports with full segment comparison; advanced automation; behavioral targeting
• Premium Plan (starts $350/month): Everything in Standard plus advanced segmentation, multivariate testing, and phone support

For most businesses, the Standard plan offers the best value for comprehensive segment comparison reporting.

Alternative Tools for Advanced Segment Analysis

While Mailchimp’s Custom Reports are powerful, some businesses need even more advanced analytics. Consider these alternatives:

Third-Party Reporting Tools

Tools that integrate with Mailchimp to provide enhanced reporting:

• Google Data Studio / Looker Studio: Free visualization tool that can connect to Mailchimp via third-party connectors
• PowerMyAnalytics: Pulls Mailchimp data into Google Sheets, Excel, or Data Studio for custom analysis.
• Littledata: Enhanced e-commerce tracking and attribution for Mailchimp users

Mailchimp API + Custom Dashboards

If you have development resources, you can use the Mailchimp API to pull data and create fully customized reporting dashboards. This allows for:

• Unlimited custom metrics and KPIs
• Integration with other data sources (CRM, analytics, e-commerce)
• Automated reporting on your schedule
• Real-time dashboards for monitoring campaign performance

Common Mistakes to Avoid

• Comparing segments that are too small: Segments with fewer than 100-200 contacts can show misleading results due to small sample sizes
• Overlooking statistical significance: A 25% open rate vs. 27% open rate on small segments might not be meaningful
• Not accounting for segment overlap: Contacts can belong to multiple segments, which affects aggregate metrics
• Ignoring seasonality: Compare segments during the same time periods for fair comparison
• Focusing only on positive segments: Understanding why certain segments underperform is just as valuable as knowing which ones succeed

Frequently Asked Questions

Can I compare campaigns sent to different audiences?

Custom Reports can only compare campaigns sent to the same audience. If you need to compare performance across different audiences, you’ll need to create separate reports or export the data for manual analysis.

How far back can I pull data for segment comparison?

Mailchimp stores campaign data indefinitely, but for optimal performance in Custom Reports, it’s recommended to analyze campaigns from the last 18-24 months. Older campaigns can still be accessed via individual campaign reports.

What’s the difference between a segment and a group in Mailchimp?

Groups are categories that subscribers can choose from (such as email preferences or interests). Segments are filtered views of your audience based on any criteria you define (behavior, demographics, engagement, etc.). Both can be used in Custom Reports for comparison.

Conclusion: Turn Segment Insights Into Action

Comparing campaign performance by audience segment is one of the most powerful ways to improve your email marketing results. With Mailchimp’s Custom Reports (the successor to Comparative Reports), you can:

• Identify your most engaged and valuable segments
• Understand which content resonates with different audience groups
• Optimize send times and frequency for each segment
• Allocate your marketing resources more effectively
• Increase overall campaign ROI by personalizing at scale

The key is to not just collect this data, but to act on it. Start by analyzing your top 3-5 most important segments this week. Identify one actionable insight from each segment, and implement changes in your next campaign. Track the results, refine your approach, and repeat.

Email marketing success isn’t about sending more emails; it’s about sending the right emails to the right people at the right time. Segment comparison reporting gives you the data you need to make that happen.
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Need help setting up segment comparison reports in Mailchimp? Contact our Mailchimp experts for personalized support and strategy.