Everything on-device
A full assistant. Zero cloud.
Every capability below is processed by AI models running locally on your device.
Private chat
Conversations run against an AI model on your own machine. Nothing you type is sent to hYYa servers or any third-party cloud AI.
Memory
hYYa Vault remembers your preferences and context across conversations — stored only on your device, editable anytime.
Personas
Give the assistant a distinct personality or expert role for sharper answers — all running locally.
Voice
Speak instead of typing. Voice is transcribed and understood on-device — audio never leaves your machine.
Document understanding
Drop in PDFs, photos, and files. hYYa Vault reads and reasons over them with a local model — your documents stay yours.
Local by default
All inference, history, and files live on your device. Delete the app and everything is gone — there is no server copy.
The privacy boundary
Exactly three things ever touch the network.
In Vault mode, nothing you type or store ever reaches hYYa servers or any third-party cloud AI. The app performs exactly three network operations — each one optional or one-time, and each one visible to you.
One-time AI-model downloads
hYYa Vault downloads the AI models it runs — once. After that, the AI works entirely offline.
The optional Web Search button
When you press it, only the query you typed is sent — never your documents, conversations, memory, or connected-account content.
Optional Connections you authorize
Link your own Google or Microsoft account and data flows directly between your device and that account — read by an on-device model, never passing through hYYa.
That's the whole list. Connected-account data is read directly from your own Google or Microsoft account to your device, processed on-device, and is never transmitted to or stored on hYYa servers — see the Privacy Policy for the full commitment.
Vault Pro
A one-time unlock that adds Local Connections — link your own Google or Microsoft account (read-only) so hYYa Vault can reason over your mail, calendar, and selected files with an on-device model. Pay once, own it; no subscription required.
hYYa Oracle — the cloud companion
When you want the world's most powerful cloud AI models, hYYa Oracle remains available with a paid plan — same app, clearly separated from Vault. What happens in Vault stays in Vault.
hYYa Vault is in development — coming to macOS first, with iOS and Android to follow.