Synapse

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made by purachina

New Chat

Search models and profiles

Chat Export and share App

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No queued follow-ups

Current chat

Conversation panel

Goal Optional

Conversation goal

Included in each request for this chat.

Files None

No files in this chat or its project.

Request context Preview

Open this section with the Context button to build a preview.

Tools Defaults

Web search URL fetching Ask before external tools

Summary Empty

Conversation summary

Sources None

No sources for this chat yet.

Forks None

No related conversations.

Welcome to Synapse

Enter your API settings to get started. Your key is stored locally and sent to the configured endpoint. When needed, it may pass through the custom CORS proxy selected in Tools.

Provider

API Key

API key storage Remember on this device This tab only

Browser storage is not an encrypted vault.

Model

Advanced connection settings

Base URL API format

Settings

Provider

API Key

API key storage Remember on this device This tab only

Browser storage is not an encrypted vault.

Model

Advanced connection and request settings

Base URL Context window

Optional per-profile override. Token counts are estimates.

Connection Profiles

Profile

No profile selected.

Profile name API Format

Request Parameters

Streaming Enter sends message Ctrl/Cmd+Enter if off Temperature

Not sent to Claude Opus 5 / Sonnet 5 / Opus 4.7+ — those models reject it.

Max response tokens

Anthropic Options

Prompt caching Cuts repeat cost ~90%

Caches the system prompt between turns. Needs roughly 1,000+ tokens of system prompt before it engages — shorter prompts silently won't cache.

Extended thinking Thinking effort

Extra Parameters (JSON) Exclude Parameters (comma-separated) Assistant Prefill

Not supported by Claude Opus 5 / Sonnet 5 / Opus 4.6+ — leave empty on those models.

Preset

Persona Describes who you (the user) are. Sent as context to the assistant. Enable SillyTavern macro conversion Roleplay User Name Prompt Entries

Starter prompts

One prompt per line

Starter prompts fill the composer. They do not make an API request.

Hide starter prompts on new chats

Theme

Background

Sidebar

Border

Text

Text Secondary

Accent

Accent Hover

User Bubble

Assistant Bubble

Radius

Msg Width

Font Size

Code BG

Font

A custom font name makes a request to Google Fonts.

Message Font Size Message Width

Emotion Sprites

Enable emotion sprites Sprite set

Web Search Anthropic native · OpenAI via search API Force tool use Requests a tool call when supported; answers still need checking. URL fetching Allow the assistant to read linked pages Ask before external tools Applies by default to new chats Search API URL SearXNG, Brave, or custom with {query}/{key}

Search API Key optional for SearXNG · required for Brave · supports Header: value

CORS Proxy URL prefix for cross-origin requests Memory Remember info across chats Hold to Screenshot Long-press messages to screenshot

Cost Tracking

Input Cost per 1M tokens Output Cost per 1M tokens

GitHub Gist

Manual sync stores encrypted conversations, memories, presets, prompts, and appearance settings in a private Gist. API keys, provider URLs, search keys, and proxy settings stay on this device. Push now creates the Gist; Pull now remains manual.

GitHub token

Gist ID Sync passphrase

Not configured

Add a GitHub token and passphrase, then push to create or update your private sync Gist.

Automatically push local changes Encrypted, debounced push; needs an existing Gist

Pairing

Include GitHub token in pairing QR Off is safer

The pairing code can fill the Gist ID and passphrase on another device. Only include the token if you trust the room and the receiving device.

Paste pairing code

Backup

Backups exclude API keys, search credentials, sync tokens, and passphrases.

Local data

Approximate sizes only. Clearing local data does not revoke public share links.

Loading storage estimate...

Clear local data

Debug logging Logs summarized API payloads to the console and this panel Include prompt and file text Off keeps message text shortened and file contents redacted

Local Updates

Not checked

Update checks only appear while Synapse is running locally.

Recent Logs

No debug events yet.

Keyboard Shortcuts

EnterSend message (configurable) Shift+EnterNew line in input Ctrl/Cmd+EnterAlways sends message Ctrl/Cmd+NNew conversation Ctrl/Cmd+/Focus input Ctrl/Cmd+KSearch conversations Ctrl/Cmd+FSearch in current chat Ctrl/Cmd+Shift+EExport backup Ctrl/Cmd+Shift+RRegenerate last response EscapeClose modal / Stop streaming Ctrl/Cmd+Shift+?Show this help @modelOverride model for one message

Projects

A project groups chats and gives them all the same instructions and files.

No projects yet. Create one, then move chats into it with the folder button in the sidebar.

Name Project instructions Project files

Saved

Project files are sent with every message in this project, so they count toward the token cost of each request.

Update Instructions

Import preview

Import strategy Merge newer records by ID Import as copies Replace imported categories