How can you tell if someone saw your message?

You can often tell if someone saw your message by checking for specific indicators in the messaging app you're using. Many platforms, like WhatsApp or Facebook Messenger, display a "seen" notification or a double checkmark once the recipient has read your message. Additionally, some apps may show the time when the message was viewed. However, this feature may not be available in all messaging services, and users may have privacy settings that prevent read receipts from being displayed.