What is Whatsy?
Whatsy acts as your personal messaging stand-in. When a message arrives on WhatsApp, the agent picks it up, weighs your persona and any rules you’ve set, and sends back a reply that sounds like you. The whole loop runs locally:- Autonomous replies — the agent handles incoming WhatsApp messages while you focus on something else.
- Local LLM via Ollama — you choose and run the model yourself (we recommend
llama3.2). No API key, no subscription, no cloud endpoint. - Runs on your Mac — a native Swift/SwiftUI app (no Electron) that stays in your menu bar and keeps the agent alive even when the window is closed.
- Your number, your tone — Whatsy links to WhatsApp via a QR scan on your existing account and replies from your real number, styled to match the way you actually write.
Key features
Persona Builder
Write a persona that captures your voice, vocabulary, and communication style. The agent uses it as its core identity when crafting every reply.
Behavior Rules
Define conditional rules — such as “if the message is from an unknown contact, reply with this” — to control exactly how the agent responds in different situations.
Privacy-First
No telemetry, no cloud AI, no third-party servers. Your message history, persona, and WhatsApp session stay entirely on your Mac.
Activity Dashboard
Review every automated reply, see which rule or persona triggered it, and inspect the full conversation thread — all from inside the app.
Response Delay
Add a configurable delay between receiving a message and sending a reply so responses feel natural rather than instant.
Spam Filtering
Built-in keyword detection silently drops obvious spam before it ever reaches the AI model, keeping your activity log clean.
What stays private
Whatsy is designed so that sensitive data never has a reason to leave your Mac. Here’s what stays local:- Message content — every incoming and outgoing message is stored only in an on-device database at
~/Library/Application Support/Whatsy/. - Your persona — the persona file that shapes the agent’s voice lives on disk, not on any server.
- WhatsApp session — the authentication session created when you scan the QR code is saved locally and is never transmitted.
- Conversation history — the context window the agent uses to craft replies is assembled in memory on your machine and discarded when the agent stops.
Whatsy uses Ollama to run the language model entirely on your hardware. No OpenAI key, no Anthropic account, no external inference endpoint — replies are generated locally and only locally.