Messages are saved for 30-days by default on free accounts, but a key feature of the service is ephemeral messaging, where the sender can set an expiration timer or select 'burn-on-read'. Up to 30 free users or 50 premium users can join a video or voice call. In response to the COVID-19 crisis, Wikr Pro is currently free for up to 30 users (as opposed to the usual 10), with pricing starting at $5 per user after that.
This is used in all apps and protects all communications within the apps. The Wikr apps themselves are not open source, although the core end-to-end crypto protocol, wickr-crypto-c, is. Unlike Wikr Me, Wikr Pro users register with an email address. Wikr also offers an enterprise app with advanced compliance and integration features, and a Wikr Me app designed for personal use (which doesn’t feature video conferencing, but does feature anonymous usernames). Wikr Pro is an end-to-end encrypted group ephemeral messaging app aimed at businesses, which includes video conferencing functionality.