Voidcat

Your papers, read and filed. AI only sees the masks.

Drop in any document. Voidcat reads it on your Mac, files it, and lets any AI help without seeing your names, IDs or addresses.

Download for Mac Open in your browser

Free · Apple silicon · macOS 15.2 or later · Open source

Voidcat asking about a demo residence card: before sending, it shows the question with the name and ID replaced by PERSON_1 and ID_1, and says 6 private details are hidden.

From a pile of papers to answers, in three steps.

Drop it in.

PDFs, scans, phone photos, spreadsheets, Word files. Voidcat reads them on your Mac with Apple Vision and a local model, gives each a title and files it into the right folder.

Two demo documents just filed: a rental contract in Home, Rental contracts and a residence card in Residency, Residence cards, with their facts waiting for review.

Approve the facts.

Expiry dates, ID numbers, amounts and addresses are pulled out and marked on the page they came from. Nothing counts until you approve it.

A demo residence card with each value highlighted on the page, next to a review list with Approve, Edit and Reject.

Ask anything, safely.

When does my card expire? What do I bring to the appointment? Use a local model, a cloud model, or Claude Desktop and Cursor through MCP. You see exactly what will be sent before it goes.

The demo residence card filed in the cloud: valid until 1 February 2027, name, NIE and nationality, filed in Residency, Residence cards.

What the AI actually gets.

Lena Ortiz Brandt PERSON_1’s residence card X1234567L ID_1 expires on 01/02/2027 DATE_2, about three months from now.

Names, ID numbers and addresses become placeholders on your device. The AI gets how far away a date is, never the date. The real values go back in when the answer arrives. Example values, invented.

Private by design, not by promise.

Encrypted on your Mac
The library and every file are locked with a key in your Mac's Keychain. A recovery key is the only other way in.
Locked in the cloud too
Voidcat Cloud is optional and end-to-end encrypted. Google Cloud in Belgium stores only locked bytes; your browser unlocks them.
See it before it's sent
Every question to a cloud AI shows its masked text first. A privacy model on your Mac catches names the rules miss.
Hide it on screen
Press ⌘⇧H before you share your screen and private details turn into placeholders there too.
Never miss a date
Renewals 60 days before an expiry, appointments and monthly payments, as Mac notifications or in your calendar.
Light to run
About 0.06 g CO₂e to read and file one document on your Mac, measured with the SCI method.

Get Voidcat for Mac.

Free and open source. Voidcat Cloud is free while it's in beta.

Download for Mac Open in your browser

Version 0.1.0 · 37 MB · Apple silicon · macOS 15.2 or later

  1. Open the download and drag Voidcat into Applications.
  2. Open it once from Settings. Voidcat isn't signed by Apple yet, so macOS stops it the first time. Go to System Settings › Privacy & Security and choose Open Anyway. You only do this once.
  3. Let it set up reading. Voidcat installs the local model for you, no Terminal needed. Leave about 7 GB free.