> ## Documentation Index
> Fetch the complete documentation index at: https://developers.particle.network/llms.txt
> Use this file to discover all available pages before exploring further.

# Start Here

> Pick the right Particle Network stack for your app. Most projects combine two or more SDKs.

Particle Network's infra stack spans five SDKs. They're independent, free to use, and designed for composability. **Most apps pick a stack of two or more** (for example, a signer—Particle Auth or Connect—plus Universal Accounts).

This page helps you pick your stack. Use the flow chart below to find it, or jump straight to a specific scenario under **"Recommended stacks"**.

***

## Pick a stack

<img className="block dark:hidden" alt="Pick a stack" src="https://mintcdn.com/particlenetwork-fccf74d2/Yf_jYGjoWA37TPp0/intro/images/decision-flow.png?fit=max&auto=format&n=Yf_jYGjoWA37TPp0&q=85&s=54ca9a48dfbaaf647212e308ab01f1e1" width="3840" height="3840" data-path="intro/images/decision-flow.png" />

<img className="hidden dark:block" alt="Pick a stack" src="https://mintcdn.com/particlenetwork-fccf74d2/Yf_jYGjoWA37TPp0/intro/images/decision-flow.png?fit=max&auto=format&n=Yf_jYGjoWA37TPp0&q=85&s=54ca9a48dfbaaf647212e308ab01f1e1" width="3840" height="3840" data-path="intro/images/decision-flow.png" />

***

## Recommended stacks

Pick a scenario that matches your goals. Each links to the starting point for your use case.

<CardGroup cols={2}>
  <Card title="Launch a multi-chain app" icon="rocket" href="/universal-accounts/overview">
    Cross-chain UX from day zero. **Universal Accounts SDK** + **Particle Connect** (or **Auth** for social-only onboarding, see below).
  </Card>

  <Card title="I have an app; make it chain-agnostic" icon="layer-group" href="/universal-accounts/how-to/provider">
    **Universal Accounts SDK** in **7702 mode.** Keep your users and wallet provider. No migration required! 
  </Card>

  <Card title="Onboard users without seed phrases" icon="user-plus" href="/social-logins/overview">
    Social logins → instant wallet. **Particle Connect** for wallet selection, **Particle Auth** for a branded custom UI.
  </Card>

  <Card title="Accept deposits from any chain" icon="arrow-down-to-bracket" href="/simple-deposit/overview">
    **Simple Deposit,** 10 lines of code. Users deposit from any chain, funds arrive as USDC in your home chain. Fully wallet-agnostic, no UX changes required.
  </Card>
</CardGroup>

<Card title="Smart accounts, full control" icon="gear" href="/aa/introduction">
  Direct bundler & Paymaster access. Use ERC-4337 primitives and pair with any signer with our **AA SDK**.
</Card>

***

## Particle Auth vs Particle Connect

Both turn a social login into a wallet. Here's how they differ.

|                         | **Particle Connect**          | **Particle Auth**            |
| ----------------------- | ----------------------------- | ---------------------------- |
| **Logins**              | Social + external wallets     | Social only                  |
| **UI**                  | Pre-built modal               | Fully customizable           |
| **Account Abstraction** | Built-in                      | Add via AA SDK               |
| **Best for**            | A drop-in covering everything | A branded Web2-style sign-in |

***

## SDK glossary

A one-line summary of everything Particle Network ships.

| **Product**                | **What it does**                                                                                                                                                                                 |
| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **Universal Accounts SDK** | One account and balance across all supported chains. Users never bridge. Uses EIP-7702 to avoid migrating funds or wallet providers for live apps. → [Docs](/universal-accounts/overview)        |
| **Simple Deposit**         | Get deposit addresses for every chain; funds auto-bridge to your destination chain as USDC. Wallet-agnostic. Not compatible with Particle Connectkit/Authkit. → [Docs](/simple-deposit/overview) |
| **Particle Connect**       | Drop-in modal for social logins and external wallets. Built-in account abstraction compatibility. → [Docs](/social-logins/connect/introduction)                                                  |
| **Particle Auth**          | Social login → EOA. Full UI customization. Pair with AA SDK for Smart Account features. → [Docs](/social-logins/auth/introduction)                                                               |
| **AA SDK**                 | ERC-4337 bundler + Paymaster + Smart Account management. Use it directly for primitives. → [Docs](/aa/introduction)                                                                              |

<Tip>
  **Can I use Universal Accounts without Particle Auth or Connect?**

  Yes. The Universal Accounts SDK is provider-agnostic. You can pair it with Particle Connect, Particle Auth, RainbowKit, Web3Modal, wagmi, or any signer that exposes a standard wallet provider.
</Tip>