Knowho — Know Who's Calling
Caller ID by your trusted list
Only for iPhone
Free · In‑App Purchases
iPhone
Spam blockers only catch known numbers. Knowho flips the approach — only numbers YOU trust get identified.
Unknown number? Stay alert. Your whitelist, your rules.
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
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
The developer, Jae Hee SHIM, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jae Hee SHIM
- Size
- 1.3 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
- Languages
English and 2 more
- English, Japanese, Korean
- Age Rating
4+
- 4+
- Copyright
- ©2026 Quite.0.lab
