CallShield

Open-source spam call and text blocker for Android with a GitHub-hosted spam database, no subscriptions.

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CallShield is a free, open-source spam call and text blocker for Android that uses a GitHub-hosted spam database, requiring no API keys, accounts or subscriptions — an alternative to paid spam-blocking apps.

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Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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