Built to protect the people scammers target most.
Callro is a spam call blocking app for Android built by Vindication Inc., a software company based in St. Petersburg, Florida. We build privacy-first consumer protection tools — software that fights for the user, not against them.
Why we built Callro
Americans over 70 lose an average of $41,800 per phone scam incident — the highest median loss of any age group. The FTC processed 2.6 million Do Not Call complaints in FY2025 alone. Imposter scams — callers pretending to be the IRS, Social Security Administration, Medicare, or a grandchild in trouble — accounted for the majority of those losses.
Most call blocking apps solve the wrong problem. They build massive shared databases of "known spam numbers" — which means they need your call data, your contact list, and your phone behavior to function. The surveillance is the product. Scammers rotate numbers constantly, so these databases are always playing catch-up.
Callro was built on a different principle: the phone should protect itself, on-device, without uploading anything. Our 26-layer Gauntlet Engine screens every call before your phone rings — using behavioral pattern analysis, STIR/SHAKEN signal verification, SIT tone generation, and neighbor spoofing detection — entirely on your device. Zero data leaves your phone.
Vindication Inc.
Vindication Inc. is a software company incorporated in Florida and headquartered in St. Petersburg. We were founded in 2024 with one mandate: build software that solves real problems for people who are being taken advantage of by systems they don't fully understand.
Our address is
7901 4th St N Ste 300, St. Petersburg, FL 33702. You can reach our support team at support@getcallro.com.Callro is currently available on Android (version 10 and above) via the Google Play Store. We are a bootstrapped company. We do not sell user data. We do not run ads. Our revenue comes entirely from subscriptions from users who choose to pay for privacy-first protection.
What Callro does
- Intercepts incoming calls before your phone rings using Android's native ROLE_CALL_SCREENING API.
- Screens calls through 26 distinct layers of on-device analysis in under 40 milliseconds.
- Generates SIT tones on identified spam calls — signaling automated dialers to remove your number from their database.
- Detects neighbor spoofing (calls using your own area code prefix to appear local) via behavioral pattern analysis.
- Verifies STIR/SHAKEN attestation levels to flag calls with no carrier authentication.
- Declares zero data collection in its Google Play Data Safety section — verifiable by any user.
- Offers a 7-day free trial with no payment method required to start.
Give your family 7 days of silence.
No payment info required. No data collected. Cancel anytime. Just install it and watch the calls stop.
No card required