Knowho - Private & Spam Guard
Manage caller ID, no app sync
Only for iPhone
Free · In‑App Purchases
iPhone
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.
A small update is here.
• Phone number extraction from photos (Premium): find numbers in a photo and add them right away
• Undo contact deletion: restore a deleted contact with the "Undo" button or by shaking your device
• Other bug fixes
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
- 1.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
- iPhone
- Languages
English and 2 more
- English, Japanese, Korean
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Knowho Pro $1.99
- Copyright
- ©2026 Quite.0.lab
