✓ PhantomCheck has no servers, no database, and no accounts. We cannot collect your data because we have nowhere to put it. Everything stays in your browser.
PhantomCheck is a fully client-side, browser-based tool. It does not operate any backend servers, does not use cookies, and does not collect or transmit any personal data to FutureStack Intelligence. This privacy policy explains exactly what data is stored, where, and why.
FutureStack Intelligence does not collect, store, or have access to:
PhantomCheck stores the following data in your browser's localStorage only. This data never leaves your device.
| Key | What it stores | Why |
|---|---|---|
pc_terms |
Terms acceptance flag | So you are not shown the terms checkbox on every visit |
__pcs |
Daily scan count and date | To enforce the 5 scans per day rate limit |
pc_mode |
Your last selected output mode | To remember Explorer, Analyst, or Operator preference |
pc_chat_history |
In-memory only — not stored | Chat history exists only while the page is open and is cleared on every new scan |
pc_key_claude |
Your Claude API key | So you do not have to re-enter it every session |
pc_key_virustotal |
Your VirusTotal API key | Same as above |
pc_key_shodan |
Your Shodan API key | Same as above |
pc_key_hibp |
Your HaveIBeenPwned key | Same as above |
pc_key_securitytrails |
Your SecurityTrails key | Same as above |
pc_key_github |
Your GitHub token | Same as above |
pc_cache[type]_[target] |
Cached scan results | To avoid re-scanning the same target repeatedly |
To delete all locally stored data: open your browser settings, find "Clear browsing data" or "Storage", and clear localStorage for phantomstack.pages.dev. All keys and cached results will be permanently removed.
When you run a scan, PhantomCheck sends your target (domain, email, or IP) directly from your browser to the following third-party APIs. Each request goes from your browser to their servers — not through FutureStack Intelligence.
By using PhantomCheck, you acknowledge that your scan targets will be transmitted to whichever of the above APIs you have enabled. Review each provider's privacy policy for their data handling practices.
If you joined the PhantomCheck waitlist, your email address was stored only in your browser's localStorage on the waitlist page. It was not transmitted to any server. We do not currently operate an email marketing platform or mailing list backend.
PhantomCheck is hosted on Cloudflare Pages. Cloudflare may collect standard web server logs including your IP address and browser information as part of serving the application. This is outside FutureStack Intelligence's control. See Cloudflare's privacy policy for details.
PhantomCheck is not directed at children under 13. We do not knowingly collect any information from children.
This policy may be updated as the product evolves. The "Last updated" date at the top of this page will always reflect the current version. For major changes, we will note them clearly.
Privacy questions or data concerns: futurestack001@gmail.com