Shield One is a lightweight spam call blocker built for privacy. Everything runs on your device, no internet connection, no tracking, no ads, and no subscriptions. Choose how strict your protection is with flexible blocking for spoofed local numbers, private numbers, and international calls. You can also whitelist area codes or numbers so important calls get through. Launching free for a limited time. Regular price will be $4.99. Currently available in North America.

Synter MCP for Claude & Cursor — The most performant Ads MCP available to use with Your AI

The most performant Ads MCP available to use with Your AI

Spam calls have gotten ridiculous, and most solutions try to fix it by collecting huge amounts of user data or relying on cloud databases. That never felt great from a privacy standpoint. Shield One was built with a different approach: everything happens locally on your device. No internet connection, no tracking, no ads, and no subscriptions. It simply blocks the types of calls you choose before they ring. You can tune how aggressive the filtering is, block spoofed local numbers, private numbers, or international calls, and even whitelist specific area codes so important calls always get through. There’s also a simple home screen widget to quickly toggle protection. To celebrate the launch, the app is free for a limited time. It will move to a $4.99 one time purchase later. Currently available in North America and would love to hear feedback from the community.

Synter MCP for Claude & Cursor — The most performant Ads MCP available to use with Your AI

The most performant Ads MCP available to use with Your AI

Shield One

Offline spam call blocker for Android. No tracking, no ads.

Offline spam call blocker for Android. No tracking, no ads.