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Call Blocker

Free#40 of 40 in Spam Call Blocking Apps

Call Blocker: A private, manual call blocker for Android, without caller-ID or robocall intelligence. Ranked #40 of 40 in Spam Call Blocking Apps by our editors (4.8/10); pricing: Free plan; best for private offline Android number blocking.

4.8/10Editor score

Visit Call Blocker

Call Blocker4.8 Visit Call Blocker

At a glance

Editor score
4.8 / 10
Pricing
Free plan
Best for
Private offline Android number blocking
Free plan
Yes
Paid from
Free
Facts checked
21 Sep 2026

Where it wins
- Blocks specific numbers and number prefixes
- Works offline without external data transmission
- Supports dual SIM and encrypted backups
Where it doesn't
- Available only on Android
- No verified caller ID or robocall detection
- Community support may not suit users seeking direct assistance

Our verdict on Call Blocker

Call Blocker is an open-source Android application for blocking unwanted calls, spam, and telemarketing. It suits individuals and small teams that want direct control over which numbers or number prefixes are blocked, rather than a service that identifies callers or relies on shared spam reports. The app maintains a history of blocked calls, supports dual-SIM configurations, and uses Android’s native CallScreeningService integration.

Privacy and offline operation are its clearest strengths. Call Blocker requires no internet connection and sends no data to external servers, making it suitable for users who prefer local call management. Backup and restore add practical continuity, while optional AES-256-GCM encryption protects backup files. The app is distributed under the GPLv3 license, which also makes its open-source model a meaningful part of its appeal for privacy-focused Android users.

Its focused approach also defines its limits. Call Blocker handles manually specified numbers and prefixes, but it does not provide verified caller ID, community-report features, or robocall detection. That makes it a good fit for blocking known nuisance numbers and maintaining a private block list, but a weaker choice for users who want automatic identification of unfamiliar callers or broader spam intelligence. The published product details show a free application rather than a set of paid tiers, and support is community-based. Choose Call Blocker for offline, manual blocking on Android; look elsewhere if caller intelligence, automated detection, or broader platform coverage is essential.

Your product? Our editors can test Call Blocker in depth and publish a review, labelled as paid · from $149/mo →

Call Blocker pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on gitlab.com

Call Blocker fact sheet

Free plan	Yes
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	Community
Built for	Solo, Small business (editorial estimate)
Pricing	Free plan
Website	gitlab.com
Facts checked	21 Sep 2026

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Featured on iTechGuides

Call Blocker is listed in our Spam Call Blocking Apps directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update