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SPECIFICTION
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Callfilter.app

callfilter.pedrorau.dev

Free plan Android
Visit callfilter.pedrorau.dev
Spec score 8.2 #7 of 41 in Spam Call Blocking Apps

What it is

Callfilter.app is an Android app that blocks incoming calls according to rules set by the user. It can reject 8-digit numbers, numbers on a personal list, custom-pattern matches, or all incoming calls. Custom matching supports regular expressions, and users can choose to receive a notification when a call is rejected. CallFilter checks calls on the device through Android’s CallScreeningService API, using a local SQLite-based rule engine without remote database lookups. The maker describes it as offline, with no accounts or tracking. Its privacy policy says the app does not send personal data to external servers and does not use third-party SDKs, advertising networks, or tracking libraries. The app is free and open source, and the maker invites users to audit or contribute to the project on GitHub. It filters calls according to the user’s settings; it does not replace the phone app. The Play Store listing warns that some features may not work correctly on Samsung devices running Android 12 or later.

Spec sheet

Purpose
CallFilter is a call blocker for Android that automatically rejects incoming calls based on rules the user controls.Read 11 Oct 2026 · callfilter.pedrorau.dev
Support
The Play Store listing gives [email protected] as the support email.Read 11 Oct 2026 · play.google.com
App limitation
The app does not replace the phone app; it filters incoming calls according to the user's settings.Read 11 Oct 2026 · play.google.com
Block all calls
The app has an option to block all incoming calls.Read 11 Oct 2026 · play.google.com
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.Read 5 Oct 2026 · play.google.com
Custom rules
The maker says CallFilter supports custom regex rules for matching phone numbers.Read 5 Oct 2026 · callfilter.pedrorau.dev
Developer location
The Play Store listing identifies the developer as Pedro Pablo Rau De la Cruz in Peru.Read 11 Oct 2026 · play.google.com
Local processing
The maker says call checks run on-device using Android's CallScreeningService API and a local SQLite-based rule engine.Read 11 Oct 2026 · callfilter.pedrorau.dev
Notable limitation
The Play Store listing warns some features may not work correctly on Samsung devices running Android 12 or later.Read 5 Oct 2026 · play.google.com
Notifications
The Play Store listing says users can optionally receive a notification when a call is rejected.Read 5 Oct 2026 · play.google.com
Number rules
The app can block calls from 8-digit numbers, numbers on a personal list, and numbers matching custom patterns.Read 11 Oct 2026 · play.google.com
Offline use
The maker describes the app as working offline without accounts or servers.Read 11 Oct 2026 · play.google.com
On-device processing
CallFilter uses Android’s native CallScreeningService API and performs call checks locally on the device.Read 5 Oct 2026 · callfilter.pedrorau.dev
Open source
The maker describes the project as open source and invites users to audit its code on GitHub.Read 11 Oct 2026 · callfilter.pedrorau.dev
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.Read 5 Oct 2026 · play.google.com
Privacy policy
The privacy policy says the app does not collect, store, or transmit personal data to external servers and has no analytics.Read 11 Oct 2026 · callfilter.pedrorau.dev
Rejection notifications
The app can optionally notify users when it rejects a call.Read 11 Oct 2026 · play.google.com
Rule engine
The maker describes a SQLite-based local rule engine with no remote database lookups.Read 5 Oct 2026 · callfilter.pedrorau.dev
Samsung compatibility
The Play Store listing says some functions may not work correctly on Samsung devices running Android 12 or later.Read 11 Oct 2026 · play.google.com
Third-party services
The privacy policy says the app does not integrate third-party SDKs, advertising networks, or tracking libraries, and core filtering uses no external APIs.Read 11 Oct 2026 · callfilter.pedrorau.dev

Plans and prices

CallFilter Free No price stated on the maker’s site or Google Play listing Read 11 Oct 2026 · play.google.com

Every Callfilter.app plan and price →

Strong points and limits

Strong points

  • Blocks 8-digit numbers, personal-list numbers, and custom matches.
  • Custom phone-number rules support regular expressions.
  • Call checks use Android’s CallScreeningService API locally.
  • Optional notifications report rejected calls.
  • Free and open source.

Limits

  • Some features may not work correctly on Samsung Android 12 or later.
  • It filters calls but does not replace the phone app.

Who it suits

CallFilter suits Android users who want to screen incoming calls with number lists or custom patterns processed locally. It may also suit people who want to inspect or contribute to an open-source project.

Verdict

CallFilter offers configurable incoming-call rules with local processing and no external API requirement for core filtering. Samsung users on Android 12 or later should account for the stated compatibility caveat.

Where Specifiction places it

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