Best QVAC Apps — On-Device AI You Can Use Today

QVAC is the engine; apps are what you actually use. As the QVAC ecosystem is young, the list of shipping apps is still small — but the ones that exist are worth knowing, because they show what private, on-device AI looks like in practice. Here's a roundup, including Tether's own flagships and the apps we build at localhost/AI.

This is a living list — we'll add to it as the QVAC ecosystem grows.

Tether's flagship apps

QVAC Workbench

Tether's general-purpose local AI app for desktop and mobile. Run open-source models locally, chat, use RAG, transcribe voice, attach images for vision tasks, and even delegate heavy work from your phone to your desktop over an encrypted P2P link. It's the best starting point if you want to experiment with local AI without writing code. Collects no data; runs entirely on your device. → Full guide

QVAC Health

Tether's private health and wellness app. All your fitness, nutrition, and biometric data — logged by voice or text, pulled from wearables — analyzed by on-device AI, encrypted and local, nothing sent to the cloud. The best pick if you want AI health insights without handing your biometrics to a commercial server. → Full guide

localhost/AI apps

Local Notes (coming soon)

A private notes and workspace app, deliberately simpler than Notion. Notebooks, notes, a focused set of blocks, tags, and search — plus the headline feature: AI chat over your own notes, at three scopes (everything, one notebook, or a single note), and inline writing actions (improve, summarize, fix, continue). All on-device. Write like no one's watching. → Learn more

Local Money (coming soon)

Private personal finance in the spirit of Copilot Money, but with no bank linking, ever. A net-worth dashboard, transactions, and on-device AI for categorization, receipt OCR, and voice-logged expenses, plus "ask your money" chat. Import a statement or an export from another app, or log entries yourself — never a live bank connection. Simple and Envelope budgeting styles. → Learn more

What these apps have in common

Every app here shares the same DNA, because they share the same engine:

Nothing leaves your device. The AI runs locally; your data stays put.
No account required. No server means nothing to sign up for.
Works offline. Once a model is downloaded, the AI works with no connection.
Private by architecture. Not a privacy setting — the absence of a server to leak to.

How to choose

Want to explore local AI hands-on? → QVAC Workbench
Want private health tracking? → QVAC Health
Want private notes with AI? → Local Notes
Want private finance without bank linking? → Local Money

Building your own?

If you're a developer, you can build the next app on this list. Start with QVAC SDK Explained and How to Build a QVAC App.

The QVAC ecosystem is growing; if you've shipped an app on QVAC, we'd love to feature it here.