SUBTRACT ARCHITECT STUDIOS · Concord, NH
Security tooling · Command-line tool

VaultCheck

A complete command-line tool that checks email addresses against the Have I Been Pwned breach corpus and produces Excel reports.

V
SHOWCASE —
A complete CLI tool: breach-corpus checks in, Excel reports out.

The goal

Practical security tooling a buyer understands in one line: check email addresses for breach exposure and get a report you can act on.

What it does — the task

  • Checks email addresses against the Have I Been Pwned breach corpus
  • Produces Excel reports
  • Pairs with the founder's Google Cybersecurity Certificate (2025) as a claim-and-artifact pair

Time back

Time back — breach-exposure checks and Excel reports handled by a single command-line tool instead of manual lookups. Time back varies by volume.

Status: Live — complete command-line tool; this page is its showcase.