OpenNexus

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OpenNexus is a local-first AI notebook and knowledge workspace. It combines Markdown vaults, hybrid retrieval, grounded chat, auditable agents, media-to-notes workflows, extensions, and optional multi-device synchronization in one desktop application.

Current release: 0.5.2-alpha1. Back up important vaults before upgrading an alpha build.

Highlights

• Course recordings to structured notes — transcribe real audio or video, review timestamped text, and generate knowledge-point notes with code blocks, Mermaid diagrams, formulas, and function plots when appropriate.
• Personal planning agents — create goal-oriented agents, generate plans and tasks, control tool permissions, and inspect execution traces.
• Local-first knowledge base — edit Markdown, manage attachments, and combine SQLite FTS5, vector retrieval, reciprocal-rank fusion, and reranking.
• Provider choice — connect OpenAI, Anthropic, Ollama, DeepSeek, and OpenAI-compatible endpoints without storing credentials in the WebView.
• Extensible workspace — install Skills, Plugins, themes, and MCP integrations with explicit permissions and trust review.
• Portable output — export notes to PDF, HTML, and DOCX; workspace images use content-addressed relative paths.
• Optional synchronization — sync notes and attachments between devices with conflict preview, revision history, and device revocation.

Architecture

flowchart LR
    UI[Vue 3 desktop UI] --> HOST[Tauri / Rust host]
    HOST --> VAULT[Local Markdown vault]
    HOST --> CORE[FastAPI AI Core]
    CORE --> INDEX[(SQLite / FTS5 / sqlite-vec)]
    CORE --> MODEL[Local or remote models]
    CORE --> EXT[Skills / Plugins / MCP]
    HOST <--> SYNC[Optional Sync Server]
    SYNC --> DB[(PostgreSQL)]
    SYNC --> OBJ[S3-compatible storage]
    COMMUNITY[Community prototype] --> EXT

The desktop host owns local filesystem access, credentials, process supervision, and privileged extension operations. The AI Core runs as a separately supervised process over an authenticated local channel. The Sync Server and community prototype are optional components. The Gitea release mirror keeps all components in one monorepo; the public GitHub projects are maintained separately.

Repository layout

Path	Purpose
frontend/	Vue 3 UI and Tauri/Rust desktop host
backend/	FastAPI AI Core, retrieval, agents, media processing, and export
server sync/	Sync v1 server and its Vue management console
community-server/	Community catalog and moderation prototype
scripts/	Build, acceptance, and release automation
tools/	Local development and packaging utilities

Public repositories

Component	GitHub repository
Desktop application and AI Core	KiriAky107/OpenNexus
Sync Server	KiriAky107/Sync-for-OpenNexus
Community prototype	KiriAky107/Community-for-OpenNexus

The Gitea distribution repository remains a monorepo so a release can be built and demonstrated from one revision. GitHub keeps the three independently deployable components in separate repositories.

Install the desktop app

1. Download OpenNexus_0.5.2-alpha1_x64-setup.exe from the v0.5.2-alpha1 release.
2. Verify the published SHA-256 checksum.
3. Run the installer and start OpenNexus from the Start menu.
4. Select or create a Markdown vault.
5. Configure a local or remote model under Settings → Model providers.

The installer contains no user vault, downloaded model weights, CUDA runtime, or preinstalled community package. Existing configuration and indexes remain under %APPDATA%\cc.kronecker.notesagent during an in-place upgrade.

Development

Requirements

Tool	Version
Node.js	22+
pnpm	10.28.0
Python	3.12+
uv	0.9.24
Rust	stable

Install dependencies:

cd backend
uv sync --frozen

cd ../frontend
corepack enable
corepack prepare pnpm@10.28.0 --activate
pnpm install --frozen-lockfile

Run the web development stack:

# Terminal 1: AI Core
cd backend
uv run python scripts/dev-server.py

# Terminal 2: frontend
cd frontend
pnpm dev

Build the Windows desktop application:

cd frontend
pnpm desktop:build

Tests

# Backend
cd backend
uv run pytest

# Frontend
cd ../frontend
pnpm test
pnpm type-check
pnpm build

# Rust host
cd src-tauri
cargo fmt --check
cargo test --all-targets --features desktop
cargo clippy --all-targets --features desktop -- -D warnings

# Sync Server
cd "../../../server sync"
uv sync --frozen
uv run pytest

Run the Sync Server

The recommended deployment uses Docker Compose with PostgreSQL and S3-compatible object storage:

cd "server sync"
Copy-Item .env.example .env
docker compose up -d --build

Use independent production secrets, TLS termination, process supervision, and regular backups. Plain HTTP options are intended only for isolated demonstrations and local testing.

Security and privacy

• Vault content stays local unless the user explicitly enables a remote model, synchronization, or another network integration.
• Provider credentials are stored by the desktop credential vault and are not persisted in frontend localStorage.
• Extension permissions, network access, and privileged tool calls are reviewed before authorization.
• Logs and bug reports must not contain vault text, access tokens, provider keys, or personal information.
• Only install Skills, Plugins, themes, and MCP servers from sources you trust.

Please report security issues privately to the repository maintainers instead of opening a public issue with sensitive details.

Contributing

Use locked dependencies, keep frontend/backend contracts synchronized, and run the relevant test suites before submitting a change. Commit messages follow Conventional Commits, for example:

feat(sync): add device revocation
fix(export): restore PDF rendering in packaged builds
test(agent): cover interrupted task recovery

OpenNexus is currently an alpha project. Issues should include the application version, operating system, reproduction steps, and redacted correlation IDs.

License

OpenNexus project code is licensed under the MIT License. Bundled models, libraries, fonts, icons, and other third-party components remain subject to their own licenses and notices; the project MIT License does not replace those terms.