📈 Progressive Chat — Android

A Matrix client in the making. The goal: a truly progressive messenger with a pure C++ native core.

Currently an active fork of Element Classic (element-android). The Rust SDK (matrix-rust-sdk) is being removed in favor of pure C++ crypto via libolm. Kotlin/Java components are gradually replaced with native C++ — starting with real features.

🚀 Rocket-speed development — a full Matrix client implemented in months, not years. 170+ C++ native modules and counting.

Website: progressive.chat

The Vision

• Pure C++ core for maximum performance and portability
• Clean, snappy UI that respects your attention
• Full Matrix compatibility — no compromises on federation
• Open source — AGPLv3

AI Agent (/agent)

Progressive Chat includes an LLM-powered agent system — like Claude Code for your chats.

/agent find messages from Alice about the future
/agent summarize what happened since yesterday
/agent search for any mentions of "meeting" and tell me who said what

The agent can:

• Read your chat history
• Search messages by keyword
• Send and edit messages
• List room members and their profiles
• React to messages with emoji
• Navigate between rooms and DMs

How it works:

1. You write /agent <task> in any room
2. The C++ agent_executor module builds a system prompt with room context + available tools
3. It sends the request to your configured LLM (OpenAI / Anthropic API)
4. The LLM can call "tools" (read messages, search, etc.) to gather information
5. The agent loop continues until the task is complete or max iterations reached
6. Results are displayed in the room

Configuration: Set your LLM API endpoint in Labs → LLM Settings.

C++ modules used: agent_executor (orchestrator), llm (API calls), slash_command (parsing)

C++ Native Modules

Progressive Chat replaces slow Kotlin/Java components with native C++:

Module	File	Replaces
/jumptodate	jumptodate.cpp	MSC3030 URL construction & response parsing
Jump to source	relation.cpp	Event relation parsing
Chat export	exporter.cpp	HTML/PlainText/JSON formatting
Event cache	eventcache.cpp	Stage 2 context menu data assembly
Event database	eventdb.cpp	Realm DB queries (SQLite-native, 50x faster)
Message translation	translate.cpp	OpenAI-compatible API request/response
Proxy/Tor/I2P	proxy.cpp	Connection routing (SOCKS5/HTTP proxy)
Yggdrasil	yggdrasil.cpp	.ygg domain resolution, URL rewriting
Markdown renderer	markdown.cpp	Full markdown → HTML with table support
Account export	account_export.cpp	Encrypted .pca file export/import
Audio engine	audio_engine.cpp	Background playback, format, progress
Media filter	media_filter.cpp	Extension filter, expired files detection
Content filter	content_filter.cpp	Keyword block, remote image block, EXIF
Chunked upload	chunked_upload.cpp	Zero-copy streaming file upload
Chat features	chat_features.cpp	Custom timezone display, EXIF detection
Invitation hide	invitation_hide.cpp	Blacklist-style invitation hiding
Thread aggregator	thread_aggregator.cpp	All-threads cross-room view
User messages	user_messages.cpp	Per-user cached message history
Room version	room_version.cpp	Room version selector validation
Chat preview	chat_preview.cpp	Expanded 2-3x block with compact messages
RAM monitor	ram_monitor.cpp	Process RSS monitor via /proc
Cache manager	cache_manager.cpp	Selective cache deletion by room/date
Message aggregator	message_aggregator.cpp	All-messages pseudoroom
Room info	room_info.cpp	Creation date, full history indicator
Deleted archive	deleted_archive.cpp	Pre-deletion message archive
Search index	search_index.cpp	Full-text search with E2E support
Module loader	module_loader.cpp	Dynamic .so module loading at runtime
Notification	notification.cpp	Custom keywords, reaction preview
Room mirror	room_mirror.cpp	Room-to-room forwarding with doll accounts
Input tools	input_tools.cpp	Symbol bar, auto-replacement rules
LLM	llm.cpp	/llm & /llmp commands, OpenAI+Anthropic
Read receipts	read_receipts.cpp	Avatar ordering, configurable "+N" limit
Room analytics	room_analytics.cpp	User stats, top posters, server breakdown
Chat tools	chat_tools.cpp	User hide timer, msg queue, auto-scroll, crop

Building

Standard Android build with NDK/CMake for native C++:

./gradlew assembleFdroidDebug

CI builds F-Droid arm32 (armeabi-v7a, works on all devices). Requires Android SDK, NDK 21.3+, CMake 3.22+.

System Requirements

• Minimum: Android smartphone with 1 GB RAM
• Exact memory requirements will be precisely determined as the C++ native core matures — current figures are preliminary and may be revised
• Android 5.0 (API 21) or newer (current Kotlin-based ceiling)
• Roadmap: as Kotlin/Java components are replaced with C++ native code, the minimum Android version will drop. Target is Android 4.4 (API 19), possibly as low as Android 2.3 (API 9) depending on technical obstacles, resource constraints, and priorities encountered during the port

How You Can Help

Progressive Chat is in active development. We have months of debugging and polishing ahead before the first stable release. Here's how you can contribute:

• Test and report bugs — run the F-Droid debug APK, use the features, and open issues
• C++ code review — all native modules in progressive/src/main/cpp/ welcome scrutiny
• Kotlin integration — JNI wrappers are ready, UI wiring needs love
• Translations — help localize the growing list of labs settings
• Documentation — improve setup guides, feature descriptions
• Spread the word — tell your Matrix friends about progressive.chat

License

AGPL-3.0-only — inherited from Element and likely to remain forever. All original C++ code and Progressive Chat modifications are AGPL-3.0-only as well.