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

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A small update is here. • Added warning icon when Caller ID is disabled.

Version 1.0.3

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.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Jae Hee SHIM
    Size
    • 1.4 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+
    In-App Purchases
    Yes
    Copyright
    • ©2026 Quite.0.lab
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More