Will Matomo track users when the web app or mobile app is offline (no internet)?

in iOS and Android apps

If you use the iOS SDK or the Android SDK, user interactions and events tracked while the user is offline are queued, and will be tracked in Matomo as soon as the user comes back online.

in the JavaScript web client

If you use the JavaScript Tracker in your web application, starting in Matomo 4.0.0, it is possible to enable offline tracking of actions (by default it is disabled). Learn more in How do I set up Matomo offline tracking?

across other platforms: offline ticket sales, retail store purchases…

You can also measure all of the ecommerce & offline sales (retail stores, ticket sales, etc.) and ensure 100% of accuracy. Learn more in tracking 100% of sales including online and retail.