Single-Day Conversion Discrepancies in Mida VS Other Analytics Tool?

When comparing A/B test results in Mida with metrics from Google Analytics (GA4) or other analytics tools, you may notice discrepancies—especially in single-day reports.

Here’s why that happens.

How Mida Tracks Conversions

Mida is purpose-built for A/B testing, not general analytics. It tracks conversions based on:

• The day a user first enters a test (i.e., when they are assigned to a variant)

• One conversion per user, regardless of how many times they convert later

So, in Mida, all conversions are tied back to the day a user first entered the test—even if they purchase days later.

Example: Why April 8 Might Look Off

Let’s say a user’s journey looks like this:

• In GA4: The purchase will show under April 8.

• In Mida: That user’s conversion will be attributed to April 7, because that’s when they were first bucketed into the test.

So when you look at Mida’s April 8 data, it’s only showing:

• Users who first entered the test on April 8

• Their eventual conversions (even if they buy days later)

How to Compare More Accurately

To make a fair comparison:

• Use Mida’s Event Log to view raw conversion events with timestamps.

• Match GA4 events with Mida's first exposure date rather than the event date.

• For day-by-day breakdowns, aggregate both tools by cohort start date if possible.

Summary

If you're seeing fewer conversions in Mida for a specific day, it doesn’t mean they’re missing—it’s likely those users entered the test earlier.