Dossier

What it is

Dossier is a local-first desktop app that takes your data exports from major platforms — Google, Meta, Amazon, Apple, and others — and assembles them into a unified profile showing what the ad networks have inferred about you. Interests, demographics, purchase patterns, tracking economics, breach exposure. All of it, in one place, on your machine.

Why it exists

Every major platform lets you download your data (thanks, GDPR). Almost nobody does, because the exports are incomprehensible ZIP files full of JSON. Dossier makes that data legible. Not to sell you something — to show you what’s already being sold about you.

What makes it different

Your data stays local. Dossier never phones home. Your personal data imports live on your machine and nowhere else. The irony of uploading your privacy data to someone’s cloud is not lost on us.

Unified profile view. See the composite picture that emerges when you combine what Google, Meta, and Amazon each think they know. It’s more complete than any single platform’s view — and more unsettling.

Ad value estimation. Rough estimates of what your attention and data are worth to advertisers. Equal parts informative and existentially uncomfortable.

Breach exposure. Cross-reference your accounts against known data breaches. Find out which password you reused in 2016 is still floating around.

The name

A dossier is a file of collected intelligence about a person. That’s literally what these companies maintain. We just let you read your own.