PaperPhonePlus

大贤者一秀

About this app

Overview
PaperPhone Plus is a full-featured, open-source instant messaging platform that delivers the familiar, polished experience of WeChat — private and group messaging, social feeds, voice and video calls — while putting privacy first through real end-to-end encryption. The entire stack is designed to be self-hosted, giving individuals and organizations complete sovereignty over their communication data.

Security & Encryption
At the heart of PaperPhone Plus is a zero-knowledge architecture. Every private message is encrypted on-device using a stateless Elliptic-Curve Diffie–Hellman (ECDH) key exchange combined with XSalsa20-Poly1305 authenticated encryption. A fresh ephemeral keypair is generated for every single message, providing forward secrecy — even if a key is compromised, past remain messages unreadable. The server handles only opaque ciphertext and routing metadata; private keys are stored exclusively on-device across a four-tier persistence layer (memory → localStorage → sessionStorage → IndexedDB) and are never transmitted. Signal-style safety number verification allows users to independently confirm the integrity of their encrypted sessions.
Communication Features
Rich Messaging — Text, images, video, documents (with file-type icons for PDF, DOCX, XLSX, etc.), voice messages, an emoji panel with 200+ emoji across 8 categories, and Telegram sticker pack integration. Messages support delivery receipts, read status, and typing indicators.
Video & Voice Calls — 1:1 calls use peer-to-peer WebRTC with Cloudflare TURN (or Metered.ca) for NAT traversal. Group calls use a WebRTC Mesh topology supporting up to 6 participants.
Group Chat — Groups support up to 2,000 members with plain-text messaging, Do Not Disturb mode, member management, and QR-code-based invitations with configurable expiry.
Friend System — Friend requests require approval with up to 512-character verification messages. Users can set custom nicknames and organize contacts with a multi-tag system using a 12-color palette.
Auto-Delete Messages — Five configurable tiers (never / 1 day / 3 days / 1 week / 1 month). In private chats, either party can set the timer; in groups, only the owner can.
File Upload — Single files up to 500 MB, stored on Cloudflare R2 (S3-compatible) or locally, with real-time progress animation.
Social Features
Moments — A WeChat-style social feed where users can post text with up to 9 photos or a single video (≤ 10 minutes). Supports likes (showing friend avatars), comments, and tag-based visibility control. Bidirectional privacy settings allow users to hide another person's Moments or block them from viewing their own.
Timeline — A Xiaohongshu (Little Red Book)-style public posting area with a dual-column masonry layout. Supports up to 50 media items and 2,000 characters per post, anonymous posting, likes, and comments.

What’s new

私聊和群聊新增批量下载，最多选择 20 条图片、视频、语音或普通文件消息，并显示下载进度及部分失败结果。
用户头像、群头像、朋友圈和时间线媒体标记为永久文件，聊天附件保持临时分类以供服务端按保留期清理。
新增旧 R2 存储迁移后的文件 URL 兼容映射。
修复聊天列表、联系人、个人资料、通话、通知、朋友圈及时间线中的迁移后用户与群组头像显示，所有头像 URL 统一进行规范化。
新增 Android 原生批量文件导出，通过系统目录选择器将所选附件真正写入用户选择的本地目录。