Cypherseal

Every day, small and medium businesses lose money to fraudulent emails they didn't catch in time. A spoofed invoice. A fake payment update from a "trusted vendor." A single wire transfer to the wrong account.

CypherSeal is a Gmail extension that detects these attacks before you act on them — and it does it entirely inside your browser. No servers. No cloud. No data ever leaves your device.

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WHO IT'S FOR

Small and medium businesses are the primary targets of invoice fraud — without the enterprise security budgets to fight it. CypherSeal brings enterprise-grade detection to every business at a fraction of the cost, with zero IT setup.

Company secretaries managing dozens of client companies. Accountants processing invoices daily. CFOs approving wire transfers. If your inbox handles money, CypherSeal watches your back.

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HOW IT WORKS

Open any email in Gmail and click Scan. CypherSeal's 18-layer detection engine analyzes the content in real time and returns a risk score from 0 to 150 with detailed findings.

When high-risk financial content is detected, Safe View shields the email body until you review the findings — preventing impulsive action on fraudulent payment requests.

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WHAT IT DETECTS

▸ Payment change instructions — "our bank details have been updated"
▸ Sender impersonation — domain lookalikes, reply-to mismatches, spoofed departments
▸ Phishing links — display text doesn't match actual URL, typosquat domains, IP-based URLs
▸ Urgency and authority manipulation — fake deadlines, fabricated executive approval
▸ Invoice anomalies — conflicting reference numbers, bank detail changes between invoices
▸ BEC linguistic patterns — common fraud phrasing across languages and regions

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ADAPTIVE INTELLIGENCE

CypherSeal builds a private map of your communication network over time. It learns which senders you interact with, how they typically communicate, and whether they send financial emails.

New senders are treated with appropriate caution. Trusted senders who suddenly request payment changes still get flagged. The system adapts to you — not the other way around.

All intelligence stays on your device. We cannot access it.

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PRIVACY BY ARCHITECTURE

This is not a marketing claim — it is an architectural fact:

- Zero external network calls
- No analytics, telemetry, or crash reporting
- No account required for the free tier
- We do not request gmail.readonly — we only read what is displayed on screen
- Uninstalling removes all data completely

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FREE
- 5 scans per day
- Full 18-layer detection engine
- Safe View protection for critical-risk emails
- Adaptive trust scoring
- No credit card required

PRO — $19/month or $190/year
- Unlimited scans
- Auto-scan on email open
- Full forensics panel with layer-by-layer breakdown
- Invoice intelligence with PDF comparison
- Contact graph visualization
- Exportable fraud reports
- Priority support

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CypherSeal is a fraud detection aid — not a guarantee. Always verify payment changes through an independent channel such as a phone call to a known number.

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