Frequently asked questions

Signum is an AI-powered website trust intelligence platform. Paste any domain and get a risk score (0–100), a verdict (Safe / Caution / Danger), and a plain-English analysis of what we found — in seconds.

We run 15+ checks in parallel: VirusTotal, Google Safe Browsing, IPQS, AbuseIPDB, SSL certificate analysis, WHOIS and domain age, DNS records, Wayback Machine history, Trustpilot, Shodan, OTX AlienVault, business registries, brand similarity detection, and live homepage content analysis. The results are synthesised by AI into a single verdict.

Very accurate for known threats and freshly-registered suspicious domains. No automated tool is 100% definitive — always apply your own judgement alongside the verdict. If something feels wrong, trust that instinct regardless of the score.

Most scans complete in 5–10 seconds. Results are cached for 6 hours, so repeat scans of the same domain are near-instant.

Yes. The Free plan gives you a risk score and verdict on any domain — no account required for the first 3 scans. After that, a free account unlocks continued access. Pro unlocks the full AI analysis, scan history, targets, and alerts at €3.99/month.

Free shows you the score and verdict. Pro shows you everything — the full AI analysis, every intelligence source, SSL deep dive, business registry checks, scan history, and the ability to track domains with alerts. See the full comparison on the pricing page.

Yes. Cancel from your account settings and you won't be charged again. You keep Pro access until the end of your billing period.

If you have an issue, contact us at hello@signumaiapp.com and we'll sort it out.

The Signum Chrome extension checks every site you visit in real time. If you land on a high-risk domain, it shows a warning banner before you interact with the page.

Yes, the extension is free to install and use.

No. The extension only checks the domain of the current page — it does not log your browsing history or send personal data anywhere. See our privacy policy for full details.

Yes. The API plan at €29.99/month gives you REST API access with 1,000 scans/month, JSON responses, webhook notifications, and an API key. See the API docs for details.

Yes — via the API plan. You can also embed a Signum trust badge on your site using our embed widget. See the API section on the homepage for the embed code.

Paste the raw headers from any suspicious email and Signum checks SPF, DKIM, DMARC, routing hops, sending IPs, and subject keywords — then gives you a plain-English verdict on whether the email is legitimate or a phishing attempt.

In Gmail: open the email, click the three dots menu, select "Show original". In Outlook: open the email, go to File → Properties, copy the "Internet headers" section.

Contact us at hello@signumaiapp.com or use the contact form. We reply within 24 hours.