---
url: https://lettuceai.app/docs/sync
title: "Sync — LettuceAI"
description: "Transfer chats, characters, and settings between devices using end-to-end encrypted peer-to-peer sync."
---

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# Sync

Sync lets you transfer your data securely between your own devices. Instead of uploading anything to a cloud service, your devices connect directly to each other over an encrypted peer-to-peer connection.

Sync is manual. Your devices only connect while you are actively syncing. Nothing runs in the background and no data is stored online.

## How Sync works

When you start a sync, one device creates a secure, temporary connection. Another device connects to it and the data is transferred directly between them. Once the sync finishes, the connection closes.

There are no accounts, no always-online servers, and no permanent cloud storage involved.

Make sure devices are in same Network

Sync Feature requires both devices to be on the same local network (e.g., connected to the same Wi-Fi). Ensure that any firewall settings allow the devices to communicate with each other. Sync will not work over the internet or different networks.

## What can be synced?

Sync can transfer the data you create inside the app, including:

-   Chats
-   Characters
-   Memories
-   Settings & preferences

...Basically, everything.

This allows you to move your setup to another device or keep two devices up-to-date.

## What Sync is NOT

-   There is no account system
-   There is no cloud backup
-   Nothing stays online after the sync ends
-   No third-party server stores your data

Sync is simply a secure transfer between devices you control.

## Security & Encryption

All sync traffic is end-to-end encrypted. Only the two devices involved in the sync can read the data being transferred.

Your data never passes through LettuceAI servers or becomes readable to anyone else.

## How to Sync

Sync is started manually. You will need both devices open at the same time, with Sync settings visible on each one.

One device becomes the **Host** (the device sending data), and the other becomes the **Join** device (the device receiving data). Once connected, the transfer begins automatically.

### Step 1: Start Hosting (Device A)

On the device that already has your data, go to **Settings → Local Sync** and choose **"Host"**, then tap **"Start Hosting"**.

A sync code and connection details will be displayed. Keep this screen open. This device will share its data with the other one.

![Host UI](https://lhdgeo5fms.ufs.sh/f/m0TBUtMLsaiE9JJA54nOqX2jKv1NyFE6ATZbzRdLmxlchJVB)

### Step 2: Join the Session (Device B)

On the device that should receive the data, go to **Settings → Local Sync** and choose **"Join"**.

Enter the IP address and code shown on Device A, then tap **"Connect"**.

If connection and authentication are successful, Device A will request user confirmation for connection and data transfer. Do not close the app until the transfer is complete.

![Join UI](https://lhdgeo5fms.ufs.sh/f/m0TBUtMLsaiEorEg7ixgeUAy1BckbI0oS8FO2ihTxv7GqEl9)

## When do I need Sync?

You may want to use Sync when:

-   moving to a new device
-   keeping a desktop and laptop in sync
-   creating a private encrypted backup on another machine

If you only use one device, you never need to enable Sync.

## Do devices stay connected?

No. The connection only exists during the sync session. Once finished, the devices disconnect automatically and remain fully offline.

## What happens if a device is offline?

Sync will simply wait until you connect the devices again. There is no background queue or cloud storage holding your data.

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