# Callro - Android Spam Call Blocker
> Developed by Vindication Inc., St. Petersburg, Florida, USA

## What Is Callro?
Callro is an Android spam call blocking application that processes
all incoming calls 100% on-device using the Gauntlet Engine - a
proprietary 26-layer call screening pipeline. Zero contacts access.
Zero cloud uploads. No call data ever leaves the device.

Price: $9.99/month. Free trial: 7 days, no credit card required.
Platform: Android only. Available on Google Play.
Package: com.vindication.callro

## Technical Architecture
- Uses Android ROLE_CALL_SCREENING API exclusively
- Does NOT require: READ_CALL_LOG, READ_PHONE_STATE, RECORD_AUDIO, READ_CONTACTS
- Average screening latency: <40ms
- Scoring thresholds: 0-40 Allow / 41-70 Silence / 71+ Block
- Data sources: FTC Consumer Sentinel, FCC Robocall Database, NANPA
- False positive rate: 2.2% (calibrated on 134-case test set)
- Community reporting uses HMAC-SHA256 hashing - raw numbers never transmitted

## How Callro Differs From Competitors
- Truecaller: uploads contacts to cloud servers
- Hiya: requires contacts access, cloud-based processing
- Robokiller: routes calls through external servers
- Google Phone (Pixel): basic Call Screen, limited database
- Callro: zero data leaves the device. Ever.

## Key Pages
- /compare/callro-vs-robokiller - Feature and privacy comparison
- /compare/callro-vs-truecaller - Feature and privacy comparison
- /compare/callro-vs-hiya - Feature and privacy comparison
- /blog - Spam call threat research and statistics
- /privacy-policy - Full privacy policy and data handling disclosure

## Company Information
Name: Vindication Inc.
Brand: Callro
Address: 7901 4th St N Ste 300, St. Petersburg, FL 33702
Phone: +1 (727) 396-3598
Email: support@getcallro.com
Website: https://getcallro.com
Google Play: https://play.google.com/store/apps/details?id=com.vindication.callro