Elemental Functions
for the Real-Time Web

Developer tools, <ai-agent>s, turnkey authentication, and edge infrastructure to build, scale, and secure a better web.

⚡ Start Shipping

⚡

See your ideas come alive instantly

Code at thought speed

Zero builds. Zero waits. Live creation with ⚡RTCode.io.

⚡ Start Shipping

⚡Instant I ⇄ O Sync: Edit live in either direction, run a one-shot Sync when you choose, or use Load for a clean refresh.
<meta io:sync> sync=reload oi:exclude
🫱🏻‍🫲🏻 🫱🏻‍🫲🏻 Agent Share™: Give agents the full live context: code, selections, console, output, pins, and screen.
Codex Claude Code Others
🔴 ▶️ ⏸️ Screen Capture: Capture screenshots and videos instantly. Share visual context with your AI agents for better collaboration and faster solutions.
Image Pins Video
🔄Reload-free Flow: Incremental updates preserve state while you tune; script edits and Load intentionally restart Output.
🎯 🔠 🖱️ Instant I ⇄ O Locate F8: Link input cursors to output elements.
Reveal and edit pointed elements.
↔️ ↕️ ⛶ Responsive Output: Control orientation, size, zoom, color scheme, and fullscreen presentation.
📜 🌐 🐞 Console & Network: Inspect logs and requests without leaving the Playground, with live counters for each console level.
📱 📲 📺 💻 🖥️ Remote Output: Mirror the live output to phones, tablets, and TVs with a link or QR code.
https://rt.ht/####
🌑 🌘 🌗 🌖 🌕 🌔 🌓 🌒 🌑 🕛 🕐 🕑 🕒 🕓 🕔 🕕 🕖 🕗 🕘 🕙 🕚 🕛 Code Versions: Name, compare, and restore every deployment.
Track Compare Restore
↩️ ⏮️ ↪️ Smart Undo: Keep undoing beyond local edits and move safely through deployed history.
Undo Skip Same Redo
🔨 🛠️ ⚙️ 🛎️ 🌐 Workers: Editor → Edge: Use request.rt.code and request.rt.edge to adapt one Worker across local and deployed execution.
<script type=worker edge>
📦 🎁 Workers: ESM + WASM Imports: Import JavaScript and WebAssembly modules from static URLs. Test them in the playground and deploy them to the edge.
Try JS/WA imports
🌐 ↪️ 🛡️ Worker Host Routing: Use io:host to impersonate foreign origins to mock third-party APIs in code.
📥 📤 📄 Input/Output Files: Turn remote content and page elements into live, independently served files without leaving one HTML document.
i: o: o:type
📦 🗂️ Worker Assets: Ship Worker-bound assets with precise headers and keep local or private content out of copied and deployed code.
worker:fs h:* edge:redact
🔒 🔐 🔓 Sign in 1 Way™: You sign in with GitHub, Google, Microsoft, or Apple to our playground. Your users sign in the same way to your deployments.
SSO MFA
🌍 🌎 🌏 RTEdge.net Hosting: Deploy full-stack apps to 337 cities instantly. Auth, storage, and edge compute included. Nothing to manage or configure.
Edge Auth Storage
📍 📍 📍 Pins & Comments: Humans and AI can pin elements or regions, capture images, add comments, and keep feedback tied to the live UI instead of vague screenshots.
Images Comments Shadow DOM IFrames
👌🏻 👌🏻 👌🏻 Select 10rem & ↑ | ↓: Make your designs dance! Perfect your numbers interactively! Enjoy a dynamic design process with instant feedback.

✨

Build faster with the agents you already use

Bring your AI to the playground

Use your existing OpenAI, Anthropic, or Google subscriptions

Agent Share™ is not available in this browser.

Use Chrome or Edge on your computer.

🤖Use your agent of choice: Use Codex, Claude Code, or any agent you prefer. Switch freely. RTCode.io works with all of them.
🫱🏻‍🫲🏻 🫱🏻‍🫲🏻 Perfect Synergy: Your AI sees the whole live playground: code, console, selections, output, pins, comments, and screen.
🔬 🕹️ ✅ Live Agent Control: Agents can inspect the exact live context, operate the Playground and Output, and verify every result as it happens.
Stop paying twice for AI: Subscribed to ChatGPT or Claude? Use them without extra markups or middleman fees.

Explore the Agent Folder

See exactly what your agent sees: instructions, skills, pins, images, console output, and eval results in one shared folder.

Keep the Agent Folder connected with Auto-Share, or start Share + Output and Pins + Output in one action.

AI agents interact directly with the playground.
The playground shows everything as it happens.

🆔

Global user authentication in 4 characters

All your auth in one suffix

Zero code. Zero config. Zero cost. Infinite scale.

~~Pay~~ Free to Scale: 10 or 10 million users — free auth for every deployment. No tiers, no limits, no catch.
$0/mo ∞ MAUs Custom Domains
Easy as ~~Pie~~ Pathname: Use one URL suffix for the auth action; Elefunc handles the flow.
app.rt.ht/::si → sign in ::sa → sign in as ::su → signed-in user ::so → sign out

Stripped after use, preserving URL
/pathname?search#hash.
🏦 🛡️ 💎 Bank-grade Security: Crystal-clear cryptography. Credentials stay between users and identity providers. We sign & verify sessions with Web Crypto.
Multi-factor Passkeys Hardware Tokens
⚛️Post-quantum cryptography: We use post-quantum cryptography today and let users verify it directly.
Verify
👤 👨🏻‍💼 👩🏻‍💼 ~~Viewer~~ → User: Let people sign in with accounts they already have. No passwords to create, no forms to fill. One click, they're in.
GitHub Google Microsoft Apple

As we add new ways, you get them for free!
👤 🏢 🌐 Collaborative Access: Control edge and Playground access with owner/editor defaults plus person, domain, public, and guest rules.
edge:user io:user io:guest

Deploy your code, get auth free!

We sign users in, verify identities and secure sessions.
You write zero lines of auth code, ship 100% faster.



<!-- frontend: restrict edge access -->
<meta edge:user=someone@elefunc.com>
<meta edge:user=elefunc.com>

<!-- playground: restrict code access -->
<meta   io:user=someone@elefunc.com>
<meta   io:user=elefunc.com>

<!-- backend: get user for your logic -->
<script type=worker edge>
  export default {
    fetch: request => { … request.rt.user … }
  }
</script>

🌐

Your code in 337 cities with one click

Deploy to Region: Earth

Reach 95% of Internet users in under 50ms on a 500 Tbps network, powered by RTEdge.net. 🌍 🌎 🌏

🌍 🌎 🌏 Explore

~~View~~ Edit Source: Append ? to pathnames and go straight from page → code in 1 keystroke! You will find your editor exactly as you left it. View, edit, ship!
elefunc.com/?
*️⃣Index the World-Wild Web: Append * to pathnames and see all the deployments you can edit. The private index for route owners and editors.
elefunc.com/* elefunc.com/pricing*
🌍 🌎 🌏 The Worldwide Edge: 337 cities. 500 Tbps capacity. <50ms latency for 95% of Internet users. Your app loads fast everywhere, not just in 1 city.
🌐 ⚙️ Serverless that actually scales: Write backend code. Click deploy. It runs in 337 cities instantly. Compare latency against Vercel Edge, Deno Deploy, and others.
Test our speed
📦 🎁 Import the world into your backends: Extend backend code with JS(/+WASM) modules using static URL imports. Bundled fresh each time you deploy.
Try JS imports
🧩 ⚙️ Go beyond JavaScript: Run streamed, embedded, and compiled WebAssembly with the same worker code in the playground and at the edge.
Try WASM imports
📄 📂 🗂️ 🗄️ Multi-scoped Key–Value Storage: const { user, domain, route } = request.rt; const kvO = env.KV.open({ }); const kvOD = env.KV.open({ domain }); const kvOR = env.KV.open({ route }); const kvU = env.KV.open({ user }); const kvUD = env.KV.open({ user, domain }); const kvUR = env.KV.open({ user, route });
🏠 🏢 Ship now, brand later: Launch on .rt.ht — the world's shortest eTLD. Get your app live now. Switch to custom domains when ready.

Scale Without Limits

Your apps powered by Earth's largest network

500
Capacity: 337
Cities: 125
Countries: 5
Clouds

🚀

Powered by leading infrastructure providers

❓

Frequently asked questions

Have another question? Ask us anything.

What is RTCode.io?: RTCode.io is Elefunc’s live, bidirectional playground for HTML, CSS, JavaScript, and Workers. Build with your agent, inspect and compose Output, then deploy the same source when it is ready.
What is RTEdge.net?: RTEdge.net is Elefunc's deployment network. It runs apps in 337 cities on 500 Tbps of capacity, keeping most users within 50ms while handling routing, auth, and scale.
What are Workers?: Workers are backend functions that run in the playground and at the edge. Static URL imports for JavaScript and WebAssembly let you test modules live and ship the same code.
Which browsers does RTCode.io support?

🏢

We believe in
a web that builds itself.

Cetin & Sunny, Founders of Elefunc, Inc.

About Elefunc, Inc.

Elemental Functions
for the real-time web

Web development is broken. Waiting for builds. Wrestling with frameworks. Configuring tools that configure other tools. We're done with that.

We build for speed, standards, and sanity:
⚡ Ship at thought speed
📐 Use the web platform
🌐 Deploy to a real edge

The native web platform gives you everything you need. Real-time updates. Global deployment. Enterprise security. All without installing your way into dependency hell.

Frameworks make false promises.
Native web platform APIs deliver:
⚡ Instant feedback loops
🎯 Complete freedom
🗿 Code that lasts

We're not building another abstraction layer. We're removing them, so you can stop fighting the platform and start shipping with it.

🟰

Meet the Builders

Cetin and Sunny build Elefunc around speed, clarity, and shipping.

Cetin Sert

CEO/Founder

Builds Elefunc's real-time playground, edge runtime, and developer workflow. Started on a Commodore 64 and still ships close to the metal.
Sunny Nam

Marketing Lead

Turns fast tools into clear stories for real users and markets. Keeps Elefunc focused on people who want to ship without waiting.

Stop waiting.

⚡ Start Shipping

Elemental Functionsfor the Real-Time Web

See your ideas come alive instantly

Build faster with the agents you already use

AgentShare™ provides AI with live

Explore the Agent Folder

Global user authentication in 4 characters

Deploy your code, get auth free!

Your code in 337 cities with one click

Scale Without Limits

Powered by leading infrastructure providers

Frequently asked questions

Elemental Functionsfor the real-time web

Meet the Builders

Cetin Sert

Sunny Nam

Stop waiting.

Elemental Functions
for the Real-Time Web

Elemental Functions
for the real-time web