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.
Your choice of model
Pick a model from the signature-verified catalogue, or add one by name. It downloads once and runs locally on your device. On iPhone, iPad and Mac that support Apple Intelligence, you can choose Apple's on-device model instead, with nothing to download.
Memory
hYYa Vault remembers your preferences and context across conversations — stored only on your device, editable anytime.
Your own tools (MCP), on‑device
Connect MCP tool servers and hYYa Vault can use them — each call shown to you and approved individually. This runs entirely on your device, with no internet and no hYYa account: most local-AI apps give you a chat box and stop there.
Construction take-off
Measure real quantities off a vector PDF or an AutoCAD DXF — per-layer lengths, block counts, drag-a-box areas — straight to Excel. Curved line-work is measured, not shortcut across, and anything it can’t measure is stated on the take-off. (A binary .dwg isn’t read on-device: save it as DXF first, or use hYYa Cloud.) AI quantity take-off →
Studio exports, on-device
Turn your documents into a finished Word report, a multi-sheet Excel workbook with live formulas, a PowerPoint with native editable charts, or a self-contained interactive dashboard — every figure checked against the source, all built locally.
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.
Apple Intelligence in hYYa Vault
Does hYYa ai work with Apple Intelligence?
Yes. In hYYa Vault, the offline engine, choose it in Settings → Local Models on an iPhone, iPad or Mac that supports it.
Can I chat with AI offline on iPhone without downloading a model?
Yes, if your iPhone supports Apple Intelligence and it is turned on. There's nothing to download and no account.
Which devices support it?
iPhone 15 Pro and 15 Pro Max, iPhone 16 and later, and iPhone Air; iPad mini (A17 Pro) and iPads with M1 or later; and Macs with M1 or later. They need iOS, iPadOS or macOS 26 or later, with Apple Intelligence turned on. On Android, hYYa Vault uses the downloadable models.
Does anything leave my device?
No. It runs on the device, offline, and what you share with it stays there.
Which languages?
English, Danish, Dutch, French, German, Italian, Norwegian, Portuguese, Spanish, Swedish, Turkish, Vietnamese, Chinese (Simplified and Traditional), Japanese and Korean. For any other language, including Arabic, the app says so and points you to a downloaded model.
Apple Intelligence or a downloaded model?
Apple Intelligence for quick everyday questions and writing. For long documents, the larger downloadable models are stronger.
The privacy boundary
Nothing you type ever touches the network.
In hYYa Vault mode, your conversations, documents, memory and files never reach hYYa servers or any third-party cloud AI — the model runs on your own machine. hYYa Vault publishes the complete, audited list of every connection it can make — eleven in total, grouped below. Everything optional is off until you switch it on, behind its own named consent card. Install a model, turn Wi-Fi off, and the assistant keeps working.
a.Getting models onto your device
Downloading the AI models you choose, refreshing the signature-verified model catalogue, and validating a model you add by name. Downloads only — nothing of yours is uploaded, and once a model is on your Mac it runs with the Wi-Fi off.
b.The optional online features — off until you turn them on
These are hYYa Vault's own capabilities, each off until you switch it on — not hYYa Cloud features borrowed back. Web Search: only the question you typed leaves, and the on-device model reasons over the results. Connections make read-only requests for the app data a turn needs. Library-scale DataLens works across far more documents than the device alone could hold. Your own API keys (BYOK, Cloud Ultra) send the key you saved plus prompts for turns run on that model. Each shows a named consent card first, and the app enforces a hard allowlist of where they may talk.
c.Signing in, and switching to hYYa Cloud
Signing in to hYYa Cloud (optional) sends your email and account id, then periodic plan checks. Switching to Cloud mode is exactly that — you're using the cloud app, and its own terms apply. Stay signed out and neither happens.
d.Reporting an AI answer or picture
Only when you choose to send one: the report — the answer or picture, your note and the reason — goes to 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.
hYYa Vault — free, no account
- Mac
- iPhone
- iPad
- Android
Everything on this page runs on your own device and costs nothing — there is no Vault subscription, no one-time unlock, and no account needed to chat, read your documents, build exports or measure a drawing. Signing in to a hYYa Cloud account is optional — creating one costs nothing — and only adds the features that genuinely need the internet: Web Search and Connections work without a paid plan; using your own API keys needs Ultra.
hYYa Cloud — the cloud companion
- Web
- Mac
- iPhone
- iPad
- Android
When you want frontier AI models from several labs — not locked to one provider — hYYa Cloud is there on a paid plan, in the same app. Each engine keeps its own memory: what you tell hYYa Vault is stored only on your device and is never shared with hYYa Cloud.
hYYa Vault is available today in the hYYa ai app for Mac, iPhone, iPad and Android — Free — no account needed.
Apple silicon · macOS 26+ · iPhone & iPad · iOS 26+ · Android 8.0+ · 64-bit