Now with AI-powered app builder & hosting

BuildReleaseHostDeploy multiplayermultiplatformmultiplayermultiplatform
appsgameswebsapps in minutesusing AIin minutesusing AI

Real-time SDK, hosting, code editor, AI builder, app store, and payments — everything to go from idea to shipped, in one platform.

DevelopersIntegrate Neblla into your current code

// Add the script tag, then:
window.onNeblla = neblla => {
  neblla.joinRoom('game-lobby');

  neblla.on('message', e => {
    console.log(e.user.publicInfo.name, e.data);
  });

  neblla.sendMessage({ move: 'ready' });
};

EveryoneCreate anything with AI

Make me a multiplayer trivia game with 4 categories and a scoreboard

Claude

Done! Your trivia game is live with real-time scoring and room support. Players can join from any device.

🔗 neblla.com/apps/2K

Platform

One platform.
Everything you need.

No infrastructure to manage. No boilerplate. Just your idea and a script tag — or just your idea and AI.

⚡

Realtime

Real-Time SDK

Rooms, messaging, master/peer pattern, and public info — all from a single neblla object. Multiplayer in 6 lines of code.

P2P & File Transfer

Messages and binary files travel directly between peers via WebRTC — no server hop, no quota consumed, no upload limits. Automatic socket fallback for messages.

Rooms & Master

Named or auto-generated rooms with master election, member tracking, and a 3-minute reconnection grace so users keep their seat across drops and tab reloads.

🌐

Host

Instant Hosting

Every app gets a live URL at neblla.com/id. Hot-served while active, auto-migrated to the edge when idle. Zero config.

Cross-Device Storage

.save() persists per device — and follows users across devices once they log in. State survives reloads, reconnections, and switches.

Custom Domains

Set your own domain for production apps. Sandbox mode available for localhost development. Full control over access.

🤖

AI for Builders

AI App Builder

Describe what you want and get a working app. Iterative "Edit with AI" to refine your creation. No coding experience needed.

Claude MCP Connector

Manage apps, files, and deployments directly from Claude. Full MCP integration — build and ship without leaving the conversation.

Bring Your Own Key

Plug your Anthropic API key in for unlimited AI edits using your own account. Free edits included for everyone to get started.

💳

Payments

Stripe Checkout

Sell digital products in a single call: neblla.buy(productId). Stripe handles checkout and payouts — you just set the price.

Consumables & Entitlements

Track purchases, spend with consume(), and validate other players' purchases. Built for in-app currencies, unlocks, and event tickets.

Anti-Cheat Verification

Continuous server-side checks plus P2P cross-verification between peers. Mismatches are reported automatically and corrected client-side.

☁️

Neblla

App Store

Publish to the Neblla marketplace. Discover, fork, and remix apps built by the community. Coming to store.neblla.com.

User Login

Drop-in Google sign-in for your players via neblla.login(). Profiles and saves carry across devices — no auth code to write.

Free to Start

50K daily data units, hosting, editor, AI builder, P2P — all included. No credit card required. Upgrade only when you're ready.

Get Started

From zero to live in 4 steps

Whether you code by hand or let AI do the work.

Sign up

Create an app

Click "+", name it, then pick: generate with AI, start from a blank canvas, or fork a template.

Build

Use the Neblla editor, iterate with AI, or manage everything from Claude via MCP.

Ship

Hit publish. Your app is live with a URL, hosted and scaled automatically.

Pricing

Free to start. Scale when ready.

Pay only for real-time data. Hosting and tools included.

Free

Everything to prototype and launch. Quota resets daily.

50K data units/day
Hosting included
Code editor & AI builder
WebRTC P2P (unlimited)
Claude MCP access

Pro

$10/mo

For production apps. 20× the quota, same simplicity.

1M data units/day
Everything in Free
Priority support
Custom domains (soon)

On-Demand

$10

10M extra data units for spikes, events, or safety net. Lasts a year.

10M data units (one-time)
Used after daily quota
Valid for 12 months
Stack with Free or Pro

A data unit = one character sent or received between your device and Neblla.
P2P messages are always free. Prices are per app.

Ready to build?

Join developers shipping multiplayer experiences with less code and more fun.

Documentation

API Reference

window.onNeblla is a global callback invoked once the Neblla instance is ready. Click any item for full details.

Methods

on(event, callback)

Registers a listener. Use '*' for all events.

off(event, callback)

Removes a listener. Empty string clears all.

sendMessage(data)

Broadcasts to everyone in the room, including yourself. P2P when available.

tellMaster(data)

Private message to the room master for authoritative logic.

sendFile(file, options?)

P2P-only binary file transfer. Send to one peer or every peer in the room.

setPublicInfo(info)

Updates your profile and broadcasts the change. Persists across rooms.

joinRoom(room)

Joins a named room. Fires 'joinRoom' on success.

leaveRoom()

Leaves the current room.

createRoom()

Server creates a new room and joins you automatically.

bookRoom()

Reserves a unique room name without joining. Returns a Promise.

save(json)

Persists data locally — and across devices once logged in.

login()

Opens the Google sign-in popup for the current user.

logout()

Signs the user out and clears the persisted login token.

buy(productId, amount?)

Opens a Stripe Checkout popup for the given product.

consume(productId, amount?)

Spends a consumable purchase. Returns the new state.

validatePurchase(userId, productId)

Verifies a peer's purchase against the server.

getProducts()

Returns the public list of products configured for this app.

Properties

neblla.users

Everyone in the current room.

neblla.room

Current room object.

neblla.me

Your own user object.

neblla.master

The current master user.

neblla.purchases

Your purchases keyed by productId.

Events

'message'

Any user sends a message. toMaster flag for tellMaster().

'joinRoom'

You successfully joined a room.

'leaveRoom'

You left a room.

'memberJoinedRoom'

A user joined (also for existing users on your join).

'memberLeftRoom'

A user left.

'publicInfo'

A user's public info changed.

'newMaster'

The master role changed.

'reconnected'

Socket reconnected and the room has been re-synced.

'sessionExpired'

Server refused to re-issue a session — reload required.

'login'

Sign-in completed (also auto-login on reconnect).

'logout'

Sign-out completed.

'purchase'

A room user bought, or anti-cheat corrected your state.

'fileStart'

A peer is about to send you a file.

'fileProgress'

Bytes received or sent during a file transfer.

'file'

A file transfer completed — file is a Blob.

Examples

See it in action

Download any example and start building on top of it.

💬

Chat

Real-time chat with user names and history.

📡

Events

Live events board with real-time updates.

🐺

Werewolf

Social deduction game with roles and voting.

♟️

Chess

Two-player chess with validation and sync.

🎨

Drawing Board

Collaborative whiteboard — everyone draws together.

Legal

Privacy Policy

Information We Collect

Developer info: email address and name to identify you as a user.

Subscription info: your Stripe customer ID and subscription ID.

What We Don't Collect

We do not store passwords, bank details, or payment info. Stripe handles that.

Third-Party Services

We use Stripe for payments and Google for authentication. These services may store cookies for their own purposes.

Data Sharing

We do not sell, share, or disclose your information. Contact [email protected].

My Apps

Pick one to edit, or create a new one.

⏳

Loading your apps…

✨

Describe changes, ask questions, or paste errors.
Selected files on the left are the context.

Private

This app isn't listed in the public gallery. Toggle on and save to publish.

Cover image

No image

Choose image

Best on

Section Tags

Content per language (click the lang code to set as default fallback)

🛍

Select a product on the left
or create a new one.

⏳

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General

Features

Danger

Sandbox

Allow localhost

Needed during local development.

Domains

Restrict where this app's SDK can be used. Add one domain per line.

Quota

Free: —

Extra: —

AI (Claude)

Enable AI

Allow users to call Claude via neblla.ia(). Requires your Claude API key in account settings.

Rooms

Multiplayer rooms exposed via the SDK (neblla.joinRoom(), neblla.room.setData()).

Allow create rooms

When off, users can only join rooms predefined in the backoffice.

Permanent rooms

When on, every room (including ad-hoc) persists its data across restarts.

Max data size (bytes)

Cap on JSON.stringify(room.data). LOBBY uses 10× this value.

Inbox

Bidirectional messaging between users and you via neblla.inbox().

Max inbox per user

Leave empty for account default.

Max outbound per user

Leave empty for account default.

Danger zone

Delete this app

Permanently remove the app, all its files and its gallery listing. This cannot be undone.

No messages.

Select a message to read.

Settings

Account

Public Info

Your public name and picture. The name will appear as the owner of all your apps.

✎

Preferred language

Messages from other users will be automatically translated into this language.

Email Addresses

Manage email addresses linked to your account. The primary email is used for notifications.

Loading…

Password

Choose a strong password — at least 8 characters.

API Token

Your token expires after 15 days of inactivity. Rotating invalidates the current one immediately.

🤖

Anthropic Claude

Add your API key for unlimited AI-powered file edits using your own account.

Not connected

Your key is stored encrypted and only used for AI edits you request. It never leaves Neblla's backend and is not shared with the client.

Get your API key at console.anthropic.com.

💳

Stripe Connect

Accept payments directly in your apps. You keep the money — Neblla takes a small platform fee.

Loading…

🌐

GoDaddy

Point a custom domain you own to any Neblla app.

Coming soon

Connect your GoDaddy account and auto-configure DNS for any domain you own. Your apps get a real address — no copy-pasting CNAME records.

Delete Account

This will permanently delete your account, all your apps, and all associated data. This cannot be undone.

BuildReleaseHostDeploy multiplayermultiplatformmultiplayermultiplatform appsgameswebsapps in minutesusing AIin minutesusing AI

One platform.Everything you need.

Realtime

Real-Time SDK

P2P & File Transfer

Rooms & Master

Host

Instant Hosting

Cross-Device Storage

Custom Domains

AI for Builders

AI App Builder

Claude MCP Connector

Bring Your Own Key

Payments

Stripe Checkout

Consumables & Entitlements

Anti-Cheat Verification

Neblla

App Store

User Login

Free to Start

From zero to live in 4 steps

Sign up

Create an app

Build

Ship

Free to start. Scale when ready.

Ready to build?

API Reference

on(event, callback)

off(event, callback)

sendMessage(data)

tellMaster(data)

sendFile(file, options?)

setPublicInfo(info)

joinRoom(room)

leaveRoom()

createRoom()

bookRoom()

save(json)

login()

logout()

buy(productId, amount?)

consume(productId, amount?)

validatePurchase(userId, productId)

getProducts()

'message'

'joinRoom'

'leaveRoom'

'memberJoinedRoom'

'memberLeftRoom'

'publicInfo'

'newMaster'

'reconnected'

'sessionExpired'

'login'

'logout'

'purchase'

'fileStart'

'fileProgress'

'file'

—

See it in action

Chat

Events

Werewolf

Chess

Drawing Board

Privacy Policy

Information We Collect

What We Don't Collect

Third-Party Services

Data Sharing

Example

Connect Claude to Neblla

Open Claude settings

Add a custom connector

Sign in with your Neblla account

Start building

BuildReleaseHostDeploy multiplayermultiplatformmultiplayermultiplatform
appsgameswebsapps in minutesusing AIin minutesusing AI

One platform.
Everything you need.