# UserAuthGuard > Zero-trust K-12 Chromebook security software by Asan Digital LLC. Patent-pending OU-Lock technology binds devices to Google Workspace organizational units for infrastructure-level security. ## Product Overview - [Features](https://userauthguard.com/features/): 1:1 device assignment, OU-Lock, real-time tracking, lost mode, check-in/check-out, bulk assignment, inventory management, compliance reports - [Pricing](https://userauthguard.com/pricing/): Free (100 devices), Pro ($4.99/student/year), Enterprise ($5.99/student/year) - [How It Works](https://userauthguard.com/): 3-step zero-trust architecture -- device identity binding, infrastructure-level policy enforcement, automatic compliance ## Key Differentiators - Patent-pending OU-Lock enforces security at Google Workspace level (not agent-based) - Complementary to content filters like GoGuardian and Securly (not a replacement) - 75% reduction in device loss across customer districts - Setup in 2 hours, no per-device agent installation - FERPA and COPPA compliant - SendGuard: per-student approved email contacts for phone ban compliance ## SendGuard — Email Contact Management - [SendGuard](https://userauthguard.com/sendguard/): Controlled student-parent email communication via Google Groups - Solves the #1 concern with school phone bans: students can still reach parents - Each student gets a school-domain email address (parent-jsmith@school.edu) that reaches approved contacts - No new apps needed — works with existing school Gmail - Google Workspace-level enforcement — no extension or agent required - Prevents unauthorized external email while allowing approved parent communication ## Case Studies - [Union City Public Schools](https://userauthguard.com/case-studies/union-city/): 17,000 students, managing devices across multiple schools - [Southeast Delco School District](https://userauthguard.com/case-studies/southeast-delco/): 4,000+ students, streamlined device management ## Comparisons - [UserAuthGuard vs GoGuardian](https://userauthguard.com/vs/goguardian/): Device security vs content filtering - [UserAuthGuard vs Securly](https://userauthguard.com/vs/securly/): Complementary tools comparison - [UserAuthGuard vs Gopher for Chrome](https://userauthguard.com/vs/gopher/): Full-spectrum platform vs fleet-ops spreadsheet add-on - [UserAuthGuard vs Blocksi](https://userauthguard.com/vs/blocksi/): Workspace-native fleet management with patent-pending OU-Lock vs a filter with quote-only pricing ## Resources - [Blog](https://userauthguard.com/blog/): K-12 device management guides, compliance, and best practices - [Whitepaper](https://userauthguard.com/whitepaper/): The Hidden Cost of Lost Chromebooks - [Chrome Extension](https://userauthguard.com/extension/): Classroom monitor and content blocking ## Company - Founded: 2017 - Headquarters: Montgomery County, Pennsylvania - Founder: Stef Verleysen - Contact: support@userauthguard.com | (267) 639-8522 - 24,000+ devices managed across school districts