alt.chat vs Zyphr

AltChat is a next-generation messenger that works over email. No new account, no phone number — just connect any existing email and start chatting. PRIVACY BY DEFAULT All messages are protected with end-to-end encryption (Autocrypt). Conversations are stored only on your device. WORKS WITH ANY EMAIL Gmail, Outlook, Yahoo, or corporate mail — AltChat works with any IMAP/SMTP provider. VOICE & VIDEO CALLS Make voice and video calls directly from the chat. Supports picture-in-picture and Bluetooth headsets. VIDEO NOTES Record and send short video messages — just like in the most popular messengers. MEDIA & FILES Send photos, videos, documents, and voice messages. Share your location. GROUP CHATS Create group conversations with anyone who has an email address. NO ADS, NO TRACKING No ads, no behavioral analytics, no third-party trackers.

Zyphr is a private messenger built around one idea: your conversations are yours. Messages and calls are end-to-end encrypted, video calls are secure video calls, and the server is never able to read them. PRIVATE BY DESIGN - End-to-end encrypted 1:1 chats (Signal Protocol) and group chats (MLS, the IETF standard for group encryption). - Encrypted voice and video calls (WebRTC / DTLS-SRTP) that connect directly between devices whenever they can. - Sign up with just an email, no phone number. Your email is stored only as an irreversible hash, never in plain text. Or sign in with Apple or Google. - The server relays only sealed ciphertext and helps your devices find each other. It holds no message content and no decryption keys. MESSAGING THAT RESPECTS YOU - Photos, videos, files and voice messages, each encrypted with its own key. - Disappearing messages, delayed send, and view-once secure media. - Read receipts and typing indicators you can turn off, in both directions. - On-device voice-message transcription (audio never leaves your phone). CALLS - One-tap voice and video, with a native call experience. - Call history with in-chat call records. YOURS TO CONTROL - Two-step verification and passkey sign-in. - Block and report, with username and impersonation filtering. - Screenshot protection across the app including video calls (secure video calls). - Delete your account and wipe your data anytime. Zyphr is ad-free and tracker-free.