Install and reinstall explained: why your numbers differ
Short answer: An install is a first-time installation on a device; a reinstall is a repeat installation on the same device. Platforms and measurement tools use different rules, so their counts differ.
Key terms
- Install: The first installation on a device.
- Reinstall: The app is installed again on a device that already had it.
- Re-engagement: An existing user returns through an ad click.
Why the numbers differ
- Ad platforms apply their own view-through windows; measurement tools count clicks.
- Time zones and delayed notifications shift daily totals.
- Duplicate install events should count once.
Decide in advance which number drives your decisions. Attrely shows installs and attributed installs separately so the source of any gap is visible.