DocPilot

Chat with your documents, natively on Windows.

A streaming, Claude-powered document assistant built as a polished WPF desktop app. Drop in a PDF, DOCX, or TXT — get a rich Markdown reply the way Claude.ai delivers it, without ever leaving Windows.

Claude.ai is great on the web. DocPilot brings the same streaming document-chat UX to the Windows desktop, with production-grade MVVM engineering underneath.

• 📄 Drag-and-drop any PDF / DOCX / TXT (up to 50 MB) and start asking
• ⚡ Streaming replies — tokens stream in via IAsyncEnumerable<string> backed by a tiny SSE parser; Markdown bubble repaints in place
• 🎯 Quick actions: Summarize, Translate, Ask Questions
• 💾 Conversations survive restarts, saved per-document under %AppData%
• 🔐 DPAPI-encrypted API key — never on disk in clear text
• 🌗 Dark + Light themes swappable at runtime, zero reload
• 🌍 English + Simplified Chinese i18n baked in
• 🧪 Demo Mode — no API key? The app streams scripted responses so you can still see the full UX
• 📤 Export transcripts as Markdown or plain text

No API key? No problem. Clone, build, launch — and hit the ✨ Try sample document button on the welcome screen. DocPilot's built-in Demo Mode streams hand-crafted Markdown replies so you can explore every feature before signing up for Claude.

git clone https://github.com/<your-handle>/DocPilot.git
cd DocPilot
dotnet run --project src/DocPilot
# or open DocPilot.sln in Visual Studio and press F5

Every feature maps to a tellable engineering story:

flowchart LR
    subgraph UI["Views (XAML)"]
      MW[MainWindow]
      DP[DocumentPreview]
      CP[ChatPanel]
      SD[SettingsDialog]
    end

    subgraph VM["ViewModels"]
      MVM[MainViewModel]
      CVM[ChatViewModel]
      DVM[DocumentViewModel]
      SVM[SettingsViewModel]
    end

    subgraph SV["Services"]
      ROUTER[AIServiceRouter]
      CLAUDE[ClaudeAIService]
      DEMO[DemoAIService]
      PARSE[DocumentParsers<br/>PDF · DOCX · TXT]
      SETTINGS[SettingsService<br/>+ DPAPI]
      HIST[ConversationHistory]
      EXPORT[ExportService]
      THEME[ThemeService]
      LOC[LocalizationService]
    end

    subgraph EXT["External"]
      API[Claude API<br/>SSE /v1/messages]
      DISK[(AppData<br/>settings · conversations)]
    end

    UI --> VM --> SV
    ROUTER --> CLAUDE
    ROUTER --> DEMO
    CLAUDE --> API
    SETTINGS --> DISK
    HIST --> DISK

DocPilot/
├── src/DocPilot/
│   ├── Models/                 Plain data types
│   ├── ViewModels/             MVVM (CommunityToolkit source generators)
│   ├── Views/                  XAML + code-behind
│   ├── Services/
│   │   ├── AI/                 ClaudeAIService, DemoAIService, router, SSE parser
│   │   ├── Parsing/            IDocumentParser + 3 implementations + factory
│   │   ├── Settings/           DPAPI-protected settings
│   │   ├── History/            Per-document conversation persistence
│   │   ├── Export/             Markdown / plain-text transcript writers
│   │   ├── Theme/              Runtime Dark ↔ Light swap
│   │   ├── Localization/       Runtime EN ↔ zh-CN swap
│   │   └── Dialog/             IDialogService (message-box abstraction)
│   ├── Converters/             XAML IValueConverters
│   ├── Themes/                 DarkTheme / LightTheme / Shared tokens
│   └── Resources/              Strings.resx (en + zh-CN), Styles.xaml, bundled sample doc
└── tests/DocPilot.Tests/       xUnit + FluentAssertions — 36 tests

The app works offline in Demo Mode — no setup required. For live responses:

1. Grab a key at https://console.anthropic.com/
2. In DocPilot, click Settings → paste the key → hit Validate → Save
3. The key is encrypted with DPAPI (current-user scope) and written to %AppData%\DocPilot\settings.json — the plaintext never touches disk

Saved transcripts live alongside it in %AppData%\DocPilot\conversations\.

dotnet test

36 tests across: document parsers, factory resolution, DPAPI round-tripping, conversation history, export formatting, SSE stream parsing, and Claude request-body construction.

• Vector retrieval for long documents (replace the 10,000-character cap)
• Sidebar conversation history browser
• Multi-provider abstraction (IAIService already fits OpenAI/Gemini)
• Claude vision support for scanned PDFs
• MSIX packaging + GitHub Releases auto-update

MIT — see LICENSE.

Built with: ModernWPF · CommunityToolkit.Mvvm · PdfPig · Markdig.Wpf · Anthropic Claude API.