Slidge uses WhatsApp’s Linked Devices feature, which may require perioding re-linking against the official client. However, you can still not use or even uninstall the official client between re-linking.
Contact JIDs are of the form
<phone-number> is the contact’s phone number in international format (e.g.
Contacts will be added to the roster as they engage with your account, and may not all appear at
once as they exist in the official client.
Your contacts’ presence will appear as either “online” when the contact is currently using the WhatsApp client, or “away” otherwise; their last interaction time will also be noted if you’ve chosen to share this in the privacy settings of the official client.