Two analytics tools, two different visitor counts. That’s normal. Here is why, and how to decide what to trust.
Every tool counts differently
If you run Google Analytics 4 alongside another analytics tool, the numbers will never match exactly. That doesn’t mean one is broken. They differ for good reasons:
- Consent. Where visitors can refuse cookies, GA4 may not record them, or may only model them. A cookie-free tool can count visits GA4 can’t.
- Blockers. Some ad blockers and browsers block Google’s tag. Others block lesser-known tags. Each tool loses a different share.
- Definitions. A “session”, an “engaged visit” and a “user” are defined differently by each tool, and time zones and day boundaries differ.
- Bots. Tools filter automated traffic in different ways.
- Sampling and thresholds. GA4 may sample large reports or hide small numbers to protect privacy.
What to do about it
- Pick one source of truth per question. Use your store or CRM for revenue, and analytics for behaviour.
- Watch the trend, not the level. If both tools move together, the gap is stable and harmless.
- Check day by day. A sudden gap usually means a tag stopped firing on some pages, or a consent change.
- Measure the overlap. If your own tag can see which visits GA4 also measured, you can estimate how much GA4 is missing.
In Metric Sensei
Analytics shows its own numbers, GA4’s, or a blended estimate that scales GA4 by the share of visits it actually measured. A daily data check compares the two and emails you when one stops recording, when pages only GA4 sees appear, or when bots inflate a day. See Analytics.