Freedom251 › Spam Call Blocking Apps
Callfilter.app
What Callfilter.app is
Callfilter.app is a free, open-source Android app for rejecting incoming calls according to rules you choose. It can block 8-digit numbers, numbers on a personal list, matches to custom patterns, or all incoming calls. Custom patterns can use regular expressions, and you can optionally receive a notification when a call is rejected. The app checks calls locally through Android’s CallScreeningService API, using a SQLite-based rule engine without remote database lookups. The maker describes it as fully offline, with no accounts or tracking. Its privacy policy says it does not collect, store, or send personal data to external servers, and that it uses no third-party SDKs, advertising networks, or tracking libraries. CallFilter filters incoming calls based on your settings; it does not replace your phone app. The project is fully open source, and users are invited to audit and contribute on GitHub. One listed caveat is that some functions may not work correctly on Samsung devices running Android 12 or later.
Who it suits
CallFilter suits Android users who want local, rule-based control over incoming calls, including custom-pattern or broad call blocking.
What it does well
- Free and open source
- Custom regular-expression rules
- Call checks run locally on the device
- Can optionally notify you about rejected calls
What to know first
- Some functions may not work correctly on Samsung devices running Android 12 or later
- Does not replace the phone app
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| CallFilter | No price stated on the maker’s site or Google Play listing | Free |
As callfilter.pedrorau.dev lists them, read 11 Oct 2026. The maker's own page has the final word.
Getting started
- Visit the CallFilter website.
- Install CallFilter on an Android device.
- Set rules for 8-digit numbers, a personal list, custom patterns, or all incoming calls.
- Choose whether to receive notifications when calls are rejected.
Verdict
Callfilter.app offers flexible call rules with local processing and no account requirement. Check the Samsung compatibility caveat if you use Android 12 or later on a Samsung device.
Questions
How much does CallFilter cost?
The listed CallFilter plan is free.
Which devices does CallFilter support?
CallFilter is listed for Android. Some functions may not work correctly on Samsung devices running Android 12 or later.
Does CallFilter replace the phone app?
No. It filters incoming calls according to your settings and does not replace the phone app.
Does CallFilter work offline?
The maker describes it as fully offline. Call checks run on-device through Android’s CallScreeningService API and a local SQLite-based rule engine.
Is CallFilter open source?
Yes. The maker describes it as fully open source and invites users to audit and contribute to the project on GitHub.
How can I contact support?
The support email is [email protected].
Facts from Callfilter.app's own pages
- App limitation
- The app does not replace the phone app; it filters incoming calls according to the user's settings. · play.google.com, 11 Oct 2026
- Block all calls
- The app has an option to block all incoming calls. · play.google.com, 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, 5 Oct 2026
- Custom rules
- The maker says CallFilter supports custom regex rules for matching phone numbers. · callfilter.pedrorau.dev, 5 Oct 2026
- Developer location
- The Play Store listing identifies the developer as Pedro Pablo Rau De la Cruz in Peru. · play.google.com, 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, 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, 5 Oct 2026
- Notifications
- The Play Store listing says users can optionally receive a notification when a call is rejected. · play.google.com, 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, 11 Oct 2026
- Offline use
- The maker describes the app as working offline without accounts or servers. · play.google.com, 11 Oct 2026
- On-device processing
- CallFilter uses Android’s native CallScreeningService API and performs call checks locally on the device. · callfilter.pedrorau.dev, 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, 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, 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, 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, 11 Oct 2026
- Rejection notifications
- The app can optionally notify users when it rejects a call. · play.google.com, 11 Oct 2026
- Rule engine
- The maker describes a SQLite-based local rule engine with no remote database lookups. · callfilter.pedrorau.dev, 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, 11 Oct 2026
- Support
- The Play Store listing gives [email protected] as the support email. · play.google.com, 11 Oct 2026
- 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. · callfilter.pedrorau.dev, 11 Oct 2026
Where Callfilter.app stands on Freedom251
- Spam Call Blocking Apps#7 of 41
- Call blocker apps#16 of 41