Can you trust the numbers in Amplitude?
Amplitude is a platform that adds AI to analytics, feedback and code so teams can build products that improve themselves. Its own help pages give 3 reasons its numbers can look different from what you expect. The first to rule out: Amplitude's totals can disagree with another tool's, as its docs say.
What does Amplitude keep track of?
Amplitude keeps its user counts by matching several kinds of ID.
In Amplitude's own words:
Amplitude uses a system of user IDs, device IDs, and Amplitude IDs to track unique users.
Missing or unexpected data, read 2026-11-12.Within a time bucket, one person is meant to be counted once.
In Amplitude's own words:
When measuring Uniques, Amplitude deduplicates users within each unique bucket.
Missing or unexpected data, read 2026-11-12.
What can make Amplitude's numbers look wrong?
Amplitude's totals can disagree with another tool's, as its docs say.
In Amplitude's own words:
Amplitude's numbers may differ from what other vendors report.
Missing or unexpected data, read 2026-11-12.A past count can go up after the fact, as Amplitude's docs explain, because late events get added.
In Amplitude's own words:
The user count can increase when Amplitude later ingests events that occurred in the past.
Missing or unexpected data, read 2026-11-12.A count can drop when two records for one person are merged, as Amplitude's docs explain.
In Amplitude's own words:
The user count can decrease when Amplitude merges user records.
Missing or unexpected data, read 2026-11-12.
How do I check Amplitude's numbers myself?
When a number looks off, Amplitude's own checklist gives you questions to work through.
In Amplitude's own words:
Use the following questions as a troubleshooting checklist for data discrepancies.
Missing or unexpected data, read 2026-11-12.Ask whoever set up tracking whether those thresholds were changed, as Amplitude's docs suggest, since that can shift the counts.
In Amplitude's own words:
These thresholds are customizable, so confirm with your developer whether anyone changed them.
Missing or unexpected data, read 2026-11-12.
How does Amplitude work with Feder?
Connect Amplitude to Feder and it joins your Visits apps. Feder only reads. It never changes anything in Amplitude.
When you connect Amplitude, Feder checks the connection straight away and shows Connected only when that check passes. If a reading cannot be taken later, Feder shows it as not read, never as zero.
Other apps that feed Visits
- Google Adsad clicks
- Google Analyticspage views and sessions
- Everflowunique clicks
- Pendopage views
Questions owners ask about Amplitude
- Why did my session count drop in Amplitude?Events marked as outside any session are left out of every session number, so they can arrive without adding sessions.
- Why did my user count drop in Amplitude?An event can be left out of a chart by a filter or because someone hid it from view, as Amplitude's docs explain, so a chart can drop while the events still arrive.
- Why did my user count jump in Amplitude?A person who clears cookies or browses privately can get a new device ID, as Amplitude's docs explain, so the same person can show up as a new user.
Where do these answers come from?
Everything this page says about Amplitude comes from Amplitude's own pages, quoted above with the date we read them. Last reviewed 2026-11-12. We read them again by 2027-11-12. If one changes, this page changes or comes down.
Know the day a number breaks, not the month after.
Some numbers are too quiet to judge daily, such as a form filled in a few times a week. Until there is enough of your own history to judge a change, Feder says it is still learning and scores nothing, rather than guessing.