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Callfilter.app
What it is
Callfilter.app is a free, open-source Android app that rejects incoming calls according to rules users choose. It can block 8-digit numbers, numbers on a personal list, custom-pattern matches, or all incoming calls. Custom rules can use regular expressions to match phone numbers, and users can opt to receive a notification when a call is rejected. CallFilter checks calls locally through Android’s CallScreeningService API and uses a SQLite-based rule engine without remote database lookups. The maker describes the app as offline, with no accounts or tracking. Its privacy policy says it does not collect, store, or transmit personal data to external servers and does not use third-party SDKs, advertising networks, or tracking libraries. CallFilter filters calls according to the user’s settings; it does not replace the phone app. The maker invites users to audit and contribute to the project on GitHub. One compatibility caveat in the Play Store listing is that some features may not work correctly on Samsung devices running Android 12 or later. Support is available at [email protected].
For and against
For
- Blocks 8-digit numbers, personal-list numbers, and custom-pattern matches.
- Can block all incoming calls.
- Call checks run locally on the device.
- Optional notifications report rejected calls.
- Open source, with invitations to audit and contribute.
Against
- Android app only.
- Some features may not work correctly on Samsung devices running Android 12 or later.
- Filters incoming calls but does not replace the phone app.
The verdict
CallFilter offers locally processed call blocking with several user-controlled rule types. Samsung device owners running Android 12 or later should note the listed compatibility warning.
Who it suits
CallFilter suits Android users who want to filter incoming calls with number lists or custom patterns. It may appeal to users looking for local call checks without accounts or tracking.
Plans and prices
CallFilter
No price stated on the maker’s site or Google Play listing
Read 11 Oct 2026 · play.google.com
On the record
- App limitation
- The app does not replace the phone app; it filters incoming calls according to the user's settings.play.google.com · read 11 Oct 2026
- Block all calls
- The app has an option to block all incoming calls.play.google.com · read 11 Oct 2026
- 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.play.google.com · read 5 Oct 2026
- Custom rules
- The maker says CallFilter supports custom regex rules for matching phone numbers.callfilter.pedrorau.dev · read 5 Oct 2026
- Developer location
- The Play Store listing identifies the developer as Pedro Pablo Rau De la Cruz in Peru.play.google.com · read 11 Oct 2026
- Local processing
- The maker says call checks run on-device using Android's CallScreeningService API and a local SQLite-based rule engine.callfilter.pedrorau.dev · read 11 Oct 2026
- Notable limitation
- The Play Store listing warns some features may not work correctly on Samsung devices running Android 12 or later.play.google.com · read 5 Oct 2026
- Notifications
- The Play Store listing says users can optionally receive a notification when a call is rejected.play.google.com · read 5 Oct 2026
- Number rules
- The app can block calls from 8-digit numbers, numbers on a personal list, and numbers matching custom patterns.play.google.com · read 11 Oct 2026
- Offline use
- The maker describes the app as working offline without accounts or servers.play.google.com · read 11 Oct 2026
- On-device processing
- CallFilter uses Android’s native CallScreeningService API and performs call checks locally on the device.callfilter.pedrorau.dev · read 5 Oct 2026
- Open source
- The maker describes the project as open source and invites users to audit its code on GitHub.callfilter.pedrorau.dev · read 11 Oct 2026
- 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.play.google.com · read 5 Oct 2026
- Privacy policy
- The privacy policy says the app does not collect, store, or transmit personal data to external servers and has no analytics.callfilter.pedrorau.dev · read 11 Oct 2026
- Purpose
- CallFilter is a call blocker for Android that automatically rejects incoming calls based on rules the user controls.callfilter.pedrorau.dev · read 11 Oct 2026
- Rejection notifications
- The app can optionally notify users when it rejects a call.play.google.com · read 11 Oct 2026
- Rule engine
- The maker describes a SQLite-based local rule engine with no remote database lookups.callfilter.pedrorau.dev · read 5 Oct 2026
- Samsung compatibility
- The Play Store listing says some functions may not work correctly on Samsung devices running Android 12 or later.play.google.com · read 11 Oct 2026
