The open-source, local-first alternative to Gamma.app

Design beautiful AI presentations — 100% offline, no subscriptions, no watermarks, your data and your keys.

  

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What is Open Gamma?

Open Gamma is a premium desktop application and a free, open-source alternative to Gamma.app. It gives you the full power of AI-assisted slide creation — without a cloud subscription, without vendor lock-in, and without your data leaving your machine.

Built on Electron, React, TypeScript, and Reveal.js, Open Gamma stores all drafts, presentation history, assets, and settings in a local SQLite database. Bring your own API key (BYOK) and connect directly to any supported LLM provider.

No cloud lock-in. No recurring fees. No watermarks. Complete data ownership.

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Features

	Feature	Description
🔮	AI Slide Scaffolding	Paste a prompt or structured outline and compile full slide decks in real time
🎨	15+ Design Themes	Switch between Startup Gradient, Noir Gold, Terminal Green, Void Lime, and more with instant HSL rendering
💾	Local-First Architecture	100% offline SQLite storage — no cloud dependencies, ever
🎙️	Kokoro TTS Voiceover	Generate on-device voice narration via local Kokoro TTS model inference
📄	Export Studio	Export to PDF, PowerPoint (.pptx), PNG images, or standalone HTML
🔑	BYOK Model Support	Connect any LLM provider with your own API key — full key security, no middleman
⌨️	Global Keyboard Shortcuts	Designed for speed with intuitive hotkeys throughout the entire app
🛡️	Zero Telemetry	No crash dumps, no analytics, no usage data collected — ever

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Download

Current release: v1.0.1 — Available on Windows, macOS, and Linux

Platform	Architecture	File	Size	Download
🪟 Windows	x64 (Intel / AMD)	Open Gamma 1.0.1.exe	216.7 MB	Download
🍎 macOS	x64 (Intel)	Open Gamma-1.0.1-x64.dmg	253.2 MB	Download
🍎 macOS	ARM64 (Apple Silicon)	Open Gamma-1.0.1-arm64.dmg	246.6 MB	Download
🐧 Linux	ARM64 (AppImage)	Open Gamma-1.0.1-arm64.AppImage	236.8 MB	Download

Installation Instructions

🪟 Windows

1. Download Open Gamma 1.0.1.exe
2. Double-click the installer and follow the setup wizard
3. Launch from your Start menu

🍎 macOS

1. Download Open Gamma-1.0.1-arm64.dmg (for Apple Silicon) or Open Gamma-1.0.1-x64.dmg (for Intel)
2. Mount the DMG and drag Open Gamma into your Applications folder
3. Launch from Applications or Spotlight

🐧 Linux

1. Download Open Gamma-1.0.1-arm64.AppImage
2. Make it executable:

   chmod +x "Open Gamma-1.0.1-arm64.AppImage"

3. Run it:

   ./"Open Gamma-1.0.1-arm64.AppImage"

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Architecture

Open Gamma converts prompts and outlines into offline presentation artifacts through a clean local pipeline:

flowchart TD
    A[User Prompt / Outline] -->|Local CLI or Cloud Model| B[Generative Engine]
    B -->|Draft & Settings| C[(Local SQLite DB)]
    B -->|JSON Slide AST| D[Presentation Compiler]
    D -->|CSS Tokens & HSL Variables| E[Reveal.js Canvas]
    D -->|Export Pipeline| F[Export Studio]
    F -->|Print Layout| G[PDF Booklet]
    F -->|DOM Parsing| H[Native PPTX]
    F -->|Asset Bundling| I[Standalone HTML]

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Keyboard Shortcuts

Shortcut	Action	Scope
Cmd / Ctrl + Enter	Submit prompt / compile outline	Form Editor
Cmd / Ctrl + E	Open Export Studio	Global
Cmd / Ctrl + S	Save active slide	Slide Editor
Cmd / Ctrl + ,	Open Settings	Global
Escape	Dismiss modals / cancel compile	Global
← / →	Step backward / forward in history	Presentation Canvas
Cmd / Ctrl + Z	Undo last slide modification	Presentation Canvas

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Local Development

Prerequisites

• Node.js v18+ (v20+ recommended)
• npm (bundled with Node)

Setup

# Clone the repository
git clone https://github.com/senapati484/opengamma.git
cd opengamma

# Install dependencies
npm install

# Start the development server (hot-reload enabled)
npm run dev

Build for Production

npm run build        # General production build
npm run build:mac    # macOS (Intel + Apple Silicon)
npm run build:win    # Windows
npm run build:linux  # Linux

Output is written to the out/ directory.

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Repository Structure

opengamma/
├── docs/                       # Research, features, and design specs
├── resources/                  # App icons and OS configurations
└── src/
    ├── main/                   # Electron main process
    │   ├── cliRunner.ts        # Executes local generation CLIs
    │   ├── cliScanner.ts       # Scans system path for generative CLIs
    │   ├── db.ts               # SQLite schema migrations & connection
    │   ├── exporter.ts         # PDF / HTML compilation scripts
    │   ├── generator.ts        # AI outline orchestrator
    │   ├── htmlToPptx.ts       # HTML → native PPTX conversion
    │   ├── ipc.ts              # Main process IPC bridge
    │   └── slideParser.ts      # Raw slide markdown parser
    ├── preload/                # Electron context bridge
    └── renderer/               # React frontend
        └── src/
            ├── components/     # UI controls, modals, and canvas layers
            ├── context/        # App-wide state management
            ├── lib/            # Slide compiler utilities and theme tokens
            └── styles/         # Global styles and Tailwind config

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Privacy & Security

Open Gamma is built on a privacy-first philosophy:

• No Telemetry — zero analytical data, crash dumps, or usage patterns collected
• Offline Storage — all data stays on your disk inside a local SQLite database
• BYOK — connect directly to your LLM provider of choice with complete API key security
• Open Source — every line of code is publicly auditable

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Contributing

Contributions are welcome! Whether it's a bug fix, a new theme, a feature improvement, or documentation — we'd love your help.

Please read our Contributing Guidelines before opening a pull request.

Ways to contribute:

• 🐛 Report a bug
• 💡 Request a feature
• 🔧 Submit a pull request
• ⭐ Star the repo to show your support

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License

Open Gamma is released under the Apache License 2.0.

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Built with ❤️ by the open-source community