Zhi

Zhi - A Zero-Trust End-to-End Encrypted Instant Messaging App

- Zhi is based on pre-shared keys, instead of generating keys through server intermediaries like other applications.
- Zhi uses simple network protocols and encoding to more easily audit the content being transferred.
- Zhi replaces metadata with random UUIDs.
- Zhi makes every chat isolated.
- Zhi only supports chatting with friends you've invited or those who have invited you.

Zhi Plus

- Zhi Plus is a subscription service.
- The period of subscription is a about $4.99/month or $49.99/year.
- Payment will be charged to iTunes Account at confirmation of purchase
- Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period
- Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal
- You can manage subscription in App Store Setting.
- Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable

What's included in Zhi Plus

- You can enable markdown, the text messages you sent will be rendered in Markdown format.
- You can use Meeting that is over TURN and end-to-end encrypted.
- You can send a single text message of 30KB(after encrypted), while free users are limited to 3KB.
- You can enable original image, the images sent will not be compressed and will be sent as original images.
- You can send a single image of 10M, while free users are limited to 2M.
- You can send a single image of 99M, while free users are limited to 10M.
- You can send a single file of 99M, while free users are limited to 10M.
- Unlimited number of Chats, while free users are limited to 100.
- The server indefinitely stores the encrypted messages from Chats of Zhi Plus users. When forwarding the encrypted messages of a Chat, for free users the server will by default save them for 7 days to facilitate the users retrieving messages from the server when they come online from being offline or at other times. Note: The server's cleanup mechanism runs a scheduled cleanup task. If it is detected during the run that there are no Zhi Plus users in the Chat, the encrypted messages from more than 7 days prior within the Chat will be cleared.

About Zhi Plus

Even with the free version of Zhi, normal use is possible, and it does not compromise the feature of end-to-end encryption. Zhi Plus is a paid option that allows paying users access to more generous features, which compensates for some of our server costs, allowing us to continue to keep it free for everyone. By subscribing to Zhi Plus you agree to the policy and terms below.

Standard Apple Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Terms of Service: https://www.txthinking.com/terms.html
Privacy Policy: https://www.txthinking.com/privacy.html