Knowho - Private & Spam Guard

Knowho is a caller ID app built around your personal whitelist — not a spam database.

Spam block Apps known spam numbers. But voice phishing numbers change daily. Unknown numbers slip right through.

Knowho flips the approach.
• You register only the numbers you trust. Everything else? Stay alert. • No matter how many times scammers change their number — they can't fool a whitelist.

Features
• Import numbers from Notes, SMS, messenger apps — anywhere with a share button
• Completely separate from iOS Contacts
• Registered names shown automatically on incoming calls
• Fully offline · No data collection — Your contacts stay on your device and are never sent to any server