Callfilter.app
Callfilter.app: A private, configurable Android blocker for users who prefer local call screening. Ranked #33 of 40 in Spam Call Blocking Apps by our editors (5.5/10); pricing: Open source; best for privacy-focused custom-rule Android blocking.
At a glance
- Editor score5.5 / 10
- PricingOpen source
- Best forPrivacy-focused custom-rule Android blocking
- Paid fromFree
- Facts checked21 Sep 2026
Where it wins
- Processes incoming calls on-device through Android’s CallScreeningService API
- Supports custom regular-expression rules and SQLite-based local logic
- No accounts, tracking, cloud synchronization, or remote database lookups
Where it doesn't
- Available only on Android
- Requires users to define and maintain custom blocking rules
- Automated spam intelligence is not verified
Our verdict on Callfilter.app
Callfilter.app is an open-source Android application for blocking incoming calls locally. It is designed for privacy-conscious users and developers who want control over how calls are screened without accounts, tracking, third-party services, or cloud synchronization. The app uses Android’s native CallScreeningService API to inspect incoming calls, applies local rules, and provides filtered-call logs through a minimalist interface. Its narrow focus is privacy-first call screening rather than a broader multi-platform calling or spam-detection service.
Its standout feature is configurable local filtering. Users can create custom blocking rules, including regular expressions, while a SQLite-based local rule engine handles the logic on the device. This gives technically minded users a way to express precise conditions and review blocked activity in filtered-call logs. Because processing stays on-device and the app does not perform remote database lookups, Callfilter.app fits users who want their screening decisions handled locally rather than through a cloud-connected service.
The trade-off is that Callfilter.app depends on user-defined rules and is limited to Android. The published product details do not establish automated spam intelligence, so it is better suited to people who are comfortable configuring their own filters than to users seeking an automated, database-driven experience. Choose it for open-source code, offline operation, regex support, and local control. Consider an alternative if you need iOS support, cloud synchronization, remote number lookups, or a verified automated spam-detection system.
Your product? Our editors can test Callfilter.app in depth and publish a review, labelled as paid · from $149/mo →
Callfilter.app pricing
Callfilter.app fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | Free |
| Robocall blocking | Not verified |
| Caller ID | Not verified |
| Call screening | Yes |
| Community reports | Not verified |
| Supported platforms | Android |
| Blocked-number limit | Not verified |
| Deployment | Mobile |
| Platforms | Android |
| Support | Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Open source |
| Website | callfilter.pedrorau.dev |
| Facts checked | 21 Sep 2026 |
Alternatives to Callfilter.app
- TruecallerA broad caller ID and spam protection app for iOS and Android.9.3
- T-Mobile Scam ShieldA free core service for T-Mobile customers, with paid call-management upgrades.9.1
- Verizon Call FilterA practical Verizon-integrated blocker with useful free protection and paid caller ID.9.0
See all Callfilter.app alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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