KeepKnown vs Protect IID
Both are Cybersecurity tools. Below, the differences that matter: verified pricing, editorial scores and who each one is really for.
KeepKnown: KeepKnown is an allow-list email filter for Gmail & Outlook that silently screens out unknown senders, turning your inbox into a VIP channel. Pricing: from from $19/mo (billed annually). (data verified July 2026)
Protect IID: Protect IID is a privacy tool that helps you generate single-use email addresses for anonymous sign-ups. Pricing: from Free (your own domain required). (data verified July 2026)
Transparency: if you buy through our links we may earn a commission, at no extra cost to you. Rankings cannot be bought. How we rate tools
At a glance
 KeepKnown |
 Protect IID | |
|---|---|---|
| Rating | — | — |
| Pricing | from $19/mo (billed annually) | Free (your own domain required) |
| Pricing model | — | Free |
| Category | Cybersecurity | |
| Visit website → | Visit website → | |
Editorial scorecard
Editorial score from our review methodology — not user ratings.
| Ease of use | 8.5 | 6.0 |
| Features depth | 6.0 | 7.5 |
| Value for money | 7.5 | 9.0 |
| Support quality | 7.0 | 5.0 |
| Integrations | 7.0 | 6.5 |
| Scalability | 6.5 | 7.0 |
| Documentation | 6.0 | 6.5 |
| Onboarding speed | 8.0 | 5.5 |
| Overall | 7.1 | 6.6 |
Frequently asked questions
What is KeepKnown?
KeepKnown is an allow-list email filter for Gmail & Outlook that silently screens out unknown senders, turning your inbox into a VIP channel.
What is Protect IID?
Protect IID is a privacy tool that helps you generate single-use email addresses for anonymous sign-ups.
How much do KeepKnown and Protect IID cost?
KeepKnown: from $19/mo (billed annually). Protect IID: Free (your own domain required).
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