Callfilter.app

6.1easy start · #14 of 41
in Spam Call Blocking Apps

Free to practise onnot on record
Free trialnot on record
Well documentedyes
Runs where you worknot on record

Runs on Android.

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Callfilter.app is ranked #14 of 41 in spam call blocking apps on The Geeks Club. It runs on Android.

Compared on spam call blocking apps

Call screening: Yes
Supported platforms: android

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The record

Purpose: CallFilter is a call blocker for Android that rejects unwanted incoming calls using rules the user controls.
Custom rules: The maker says CallFilter supports custom regex rules for matching phone numbers.
On-device processing: CallFilter uses Android’s native CallScreeningService API and performs call checks locally on the device.
Rule engine: The maker describes a SQLite-based local rule engine with no remote database lookups.
Call controls: The Play Store listing says users can block 8-digit numbers, numbers on a personal list, custom-pattern matches, or all incoming calls.
Notifications: The Play Store listing says users can optionally receive a notification when a call is rejected.
Offline use: The maker describes the app as 100% offline, with no accounts or tracking.
Privacy policy: The privacy policy says the app does not collect, store, or transmit personal data to external servers and does not use third-party SDKs, advertising networks, or tracking libraries.
Open source: The maker describes CallFilter as fully open source and invites users to audit and contribute to the project on GitHub.
Notable limitation: The Play Store listing warns some features may not work correctly on Samsung devices running Android 12 or later.
Phone app relationship: The Play Store listing says CallFilter does not replace the phone app and only filters incoming calls according to the user's settings.
Support: The Play Store listing gives [email protected] as the support email and links to the maker’s website and privacy policy.

Where it ranks on The Geeks Club

Best Spam Call Blocking Apps in 2026#14 of 41

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Sources

callfilter.pedrorau.dev· checked 5 Oct 2026
play.google.com/store/apps/details· checked 5 Oct 2026
callfilter.pedrorau.dev/privacy· checked 5 Oct 2026