Explainroo UI

Visual No-Code Web Studio for Animated Technical Explainer Videos

Direct Download • Quickstart • How It Works • Themes • Components • Exports • Sponsor • Roadmap

_{Web • React 19 • TypeScript 5.8 • Rough.js • Node.js 18+}

Built as an open-source visual web studio for the Explainroo programmatic video engine.

_{Sponsored with ❤️ by FondPeace.com}

Turn system architectures, developer workflows, distributed systems, and code algorithms into narrated, animated explainer videos — with hand-drawn Rough.js vector physics, real-time audio ducking, word-synchronized triggers, and 1-click video recording.

📥 Direct Download & 1-Click Run

You don't need Git or complex command lines to download and run Explainroo UI:

⚡ 3-Step Instant Launch for Anyone:

1. Download: Click 📥 Download Latest ZIP.
2. Extract: Right-click the downloaded .zip and choose Extract All.
3. Run:
   • On Windows: Double-click start.bat.
   • On macOS / Linux: Open Terminal and run ./start.sh.
   • Explainroo UI auto-installs dependencies and opens your browser at http://localhost:3000 automatically!

⚡ How It Works

Explainroo UI coordinates narration text, speech audio, and vector animations into a synchronized 16:9 canvas:

[ Narration Script ] ──> Word Timing Alignment Engine ──> Spoken Timestamp Triggers
                                                                 │
[ Visual Toolbox ]   ──> Hand-Drawn Architecture Nodes ──────────┼──> 16:9 Video Canvas
                                                                 │           │
[ Audio Engine ]     ──> Web Speech TTS + Generative Ducking ────┘           ▼
                                                                        Export Options:
                                                                        • Direct WebM / MP4
                                                                        • Headless CLI Bundle
                                                                        • PNG Poster Frame

The 3-Step Creation Flow

1. Write or Prompt Narration: Paste your voiceover script into the editor, or click AI Director to let Google Gemini generate a multi-scene breakdown from any software topic or repo.
2. Anchor Visuals to Words: Click any spoken word in your script (e.g. "browser", "database", "cloud") to attach diagram components. The element animates onto the canvas the exact split-second that word is spoken.
3. 1-Click Video Recording: Preview with synchronized voiceover narration and auto-ducking ambient music. Export directly to WebM / MP4 video or download a CLI project bundle (script.md + scenes.js).

🎨 4 Visual Themes

Switch the entire video's artistic personality with a single click. Every theme renders with custom pencil, marker, and hatch-fill strokes:

• 📝 Whiteboard — Warm cream paper (#faf9f5), slate ink strokes, and textured colored fills. Ideal for system design and architecture tutorials.
• ⚡ Dark Tech — Deep midnight canvas (#090d16) with glowing neon cyan cyber schematics. Built for cloud architecture and microservices.
• 📐 Blueprint — Navy engineering blueprint (#0c2340) with crisp white drafting lines and grid measurements. Perfect for low-level protocols and compiler internals.
• 🎓 Chalkboard — Classroom slate (#15251d) with soft textured chalk strokes and pastel highlights. Great for computer science algorithms and math.

📱 Mobile & PWA Experience

Explainroo UI is an installable Progressive Web App (PWA) with responsive touch controls and offline precaching:

🚀 Key Features

• 🎨 Hand-Drawn Vector Aesthetics: Powered by Rough.js with natural pencil wobbles, marker strokes, and cross-hatch fill physics.
• ⚡ Word-Level Synchronization: Tie any visual element (server, database, terminal, arrow) to a specific word. It pops into view at that exact millisecond.
• 🎙️ Web Audio Narration Engine: In-browser speech synthesis with customizable speech rate, pitch, and voice selection.
• 📁 Custom Voiceover Audio Import: Upload external .mp3 or .wav voiceover tracks per scene with live playback preview and instant audio ducking.
• 🎵 Auto-Ducking Background Music: Generative ambient harmonic chords that dynamically lower volume whenever the narrator speaks.
• 💬 Whisper-Style Dynamic Captions: Sleek floating subtitle pill that highlights the active spoken word in glowing yellow without obscuring the canvas.
• 🤖 Built-in AI Director: Generate complete multi-scene explainer video projects from any prompt or repository using Google Gemini.
• 💾 One-Click Video Recording: Record and download .webm or .mp4 video directly in your browser with zero external dependencies.

🧰 Component Library

Place pre-built, responsive diagram blocks onto the canvas with a single click:

• Architecture Nodes: Client Laptop, Server Rack, Database, Cloud / DNS Cluster, API Gateway, Message Queue.
• UI Mockups: macOS Browser Window with live URL bar, Unix Terminal Window with active prompt, Mobile Smartphone viewport.
• Infrastructure Icons: Redis Cache (⚡), Auth Bearer Token (🔑), Edge CDN (🌐), End User Actor (👤).
• Dynamic Connectors: Hand-drawn straight and curved animated arrows with request/response labels.

📦 Export & Download Formats

• 🌐 Standalone Offline HTML Player (.html): 1-click single-file download with all scenes, vector animations, Whisper subtitles, and voice synthesis embedded. Zero-dependency, offline-ready, double-click to play anywhere.
• 🎬 WebM / MP4 Video: Direct client-side video capture ready for YouTube, Twitter/X, LinkedIn, and product demos.
• 📦 Headless CLI Bundle (.zip): Complete package containing standalone-player.html, project.explainroo.json, script.md, and scenes.js compatible with node bin/explainroo.js render.
• 💾 Project Backup (.json): Save and reload full project state into Explainroo UI anytime.
• 📸 PNG Frame Poster: High-resolution 1280x720 canvas snapshot for documentation, thumbnails, and blog posts.

⌨️ Studio Shortcuts

🛠️ Quickstart

Prerequisites

• Node.js 18+ or 20+
• npm or bun

1. Clone & Install

git clone https://github.com/jastfan/explainroo-ui.git
cd explainroo-ui
npm install

2. Configure Environment (Optional for Gemini AI)

cp .env.example .env

Add your Gemini API key in .env:

GEMINI_API_KEY=your_gemini_api_key
PORT=3000

3. Launch Development Studio

npm run dev

Open http://localhost:3000 in your browser.

🗺️ Roadmap

• Multi-Track Drag & Drop Timeline: Draggable element cues with magnetic snapping to spoken word markers.
• Neural TTS Voiceover: Integration with ElevenLabs and Edge Neural voices for ultra-realistic narration.
• Cloud Persistence: User accounts and project sync with Supabase / PostgreSQL.
• Hardware-Accelerated WebAssembly Export: Direct @ffmpeg/ffmpeg WASM rendering for 60 FPS deterministic H.264 MP4 export.
• Developer Logo Library: Native rough-sketch logos for Docker, Kubernetes, AWS, React, Python, and PostgreSQL.

🤝 Contributing

Contributions, bug reports, and suggestions are welcome!

1. Fork the repository on GitHub
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m "feat: add amazing feature")
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

💖 Sponsor

Explainroo UI is proudly supported and sponsored by:

FondPeace.com — Promoting inner peace, mindful wellness, and calm productivity for modern creators and developers.

📄 License

This project is open-source and licensed under the MIT License.