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Troubleshooting synchronization issues between multiple devices

Why aren’t my devices synchronizing?

For your devices to synchronize properly, they must:


  • Be connected to the same shop
  • Be connected to the internet


Check that the devices are connected to the same shop

To see all devices linked to your shop:


  • Go to Settings > Devices. You will find the list of connected devices.
  • Adding new devices is available with a Premium subscription.


Why aren’t sales or stock levels synchronizing?

In some cases, sales do not synchronize because:

  • A device is not connected to the internet
  • Sales were recorded in offline mode. Without an internet connection, the device cannot send sales to other devices.
  • The device is not logged into your account (logged out devices do not transmit data to the server)
  • The application version is too old and no longer compatible with the current synchronization system
  • Your subscription has expired (devices may stop syncing if the subscription is no longer active)


⚠️ If a device stays offline for a long period or runs an outdated version of the app, data may not be transmitted to the server and can be permanently lost.


How to force synchronization?

To make sure everything is properly synchronized:

  • On the device where sales are not recorded online, connect it to a stable internet connection

To make sure everything is properly synchronized:

  • The selected currency is different from the one used for your sales
  • The date, device, or user filters are restricting the view
  • There is a time zone difference between your device and the shop location




  • Go to the Dashboard tab and pull the page down → A success notification will appear if synchronization is effective
  • Make sure you are viewing the same date filter on both devices (for example: "Today" or "Since forever"). If devices are in different countries or time zones, adjust the date filter to match the shop’s local time.
  • Make sure all devices are using the same version of the application. To download the latest version: https://link.tunder.co/share-tunder


If a device shows "Sync failed" or no data:

  • Open the menu and verify that you are in the correct shop
  • Disable demo mode if activated
  • Check that the correct currency is selected in Settings


Still having issues?

If sales are still not synchronizing after these steps:

  • Contact support via the chat
  • Go to the Dashboard tab and pull the page down → A success notification will appear if synchronization is effective
  • Make sure all devices are using the same version of the application. To download the latest version: https://link.tunder.co/share-tunder


I can’t see my sales data

If your catalog is visible but no sales appear, check the following:


  • Correct shop selected: Go to Settings > My shop and make sure you are on the right shop (especially if you have several shops with similar names).
  • Date filter: Verify the selected period in the Dashboard or Exports (try “All time” or a custom period covering your event).
  • Demo mode: If demo mode is activated, you will only see demo sales. Go to Settings and disable Demo mode to see real sales (and vice versa).
  • Correct account: Make sure you are logged in with the same email used to record the sales (Settings > My account).
  • Device connected to the internet: If sales were made on another device (tablet/phone), reconnect that device to the internet and open the app. The sales will automatically sync once the device is back online.
  • Recently disconnected device: If a device was disconnected (“kicked”) while offline, reconnecting it to the internet will not erase sales. It will push any stored sales as soon as it reconnects.


If the issue appeared after logging out and back in, fully close the app and reopen it once connected to the internet to trigger synchronization. Go to dashboard > pull the page to force synchronization


Still having issues?

If sales are still not synchronizing after these steps:


Updated on: 04/05/2026

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