Open Frontier

The Khan Academy of interactive simulation. Learn robotics, quantum physics, blockchain, biology, chip design, and space by building things in your browser.

14
Stores
300+
Apps & Sims
$0
Always Free
Scroll to explore

Apps & Games

Ship real software. Free tier for everyone, Pro for power users.

📱FreeAppStore144 apps
Free PWA apps that run offline. Timer, notes, weather, fitness, finance. Open source, community built, zero tracking.
ProductivityUtilitiesHealthFinance
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🚀ProAppStore$9/mo
Server-powered apps with AI, databases, file storage, cron jobs, custom domains. One subscription unlocks everything.
AIDatabaseStorageCron
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🎮FreeGameStore80 games
Free browser games. Chess, tetris, racing, puzzle, RPG. Multiplayer rooms, leaderboards, real-time WebSocket gameplay.
Canvas3DCardsMultiplayer
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🏆ProGameStore$9/mo
Persistent worlds, server-authoritative multiplayer, daily challenges, cron-driven events. MMO-grade infrastructure.
RealtimeTurn-based3DPersistent
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Interactive Simulations

148 browser-based simulations. Learn how hard things work by building them.

🦾Robotics40 sims
Control systems, SLAM, path planning, neural networks, swarm intelligence, sensor fusion. Build and train robots in your browser.
MotionSensingPlanningLearning
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⚛️Quantum Computing25 sims
Real quantum circuits with state-vector simulation. Grover's, VQE, teleportation, error correction, annealing.
CircuitsAlgorithmsProtocolsFundamentals
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🔗Blockchain & Crypto21 sims
Build blockchains from scratch, mine blocks, write smart contracts, simulate DeFi. Consensus algorithms visualized.
BlockchainCryptographyDeFiContracts
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🔧Chip Design22 sims
From logic gates to full CPUs. Pipeline visualization, cache hierarchies, GPU rendering, design your own ISA.
ArchitectureDesignGPUFabrication
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🚀Space & Orbital22 sims
Orbital mechanics, Hohmann transfers, gravity assists, rocket staging, atmospheric reentry, satellite constellations.
OrbitalPropulsionMissionsObservation
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🧬Biology & Biotech18 sims
CRISPR gene editing, protein folding, ecosystem dynamics, enzyme kinetics, biological neural networks.
GeneticsMolecularNeuroEcology
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Websites & AI

AI-powered website builders and intelligent browser agents.

🌐FreeWebStore108 templates
AI-generated one-page websites for small businesses. Describe what you need, get a professional site in seconds.
Static HTMLAI GeneratedSmall Business
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🏗️ProWebStoreCMS
Full CMS engine with knowledge-graph database, AI agent, entity modeling, themes, custom domains. WordPress-class.
CMSAI AgentEntitiesThemes
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🤖FreeAgentStore51 tools
Browser AI tools. Libraries (evolved heuristics), Models (ONNX via Transformers.js), Agents (Chrome AI or API key).
LibrariesModelsAgents
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⚡ProAgentStorePro tier
Server-powered AI agents with Workers AI, D1, Durable Objects, cron. Full backend AI with edge compute.
Workers AID1CronDOs
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How It Works

No accounts. No installs. No cost. Just open and learn.

🖥️
Runs in Your Browser
No install, no signup, no download. Open any simulation and start immediately. Works on phone, tablet, desktop.
🎮
Learn by Doing
Change parameters, see results in real-time. Break things on purpose. Understanding comes from interaction, not reading.
🔓
Fully Open Source
Every simulation is a single HTML file. View source, fork it, modify it. MIT licensed. The code IS the lesson.
🤝
Community Built
Anyone can contribute a simulation. One HTML file + one PR = live on the platform. No gatekeepers, no approval queue.

Start Exploring

Pick a domain that interests you. Every free store is free forever.

Apps Games Robotics Quantum Crypto Chips Space Bio Websites AI Tools