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SpatialSentry

Built at Meta Global AI Developer Hackathon · Oct 26, 2026 · Remote

SpatialSentry — Demo video

SpatialSentry is the world’s first 24/7 ephemeral AI smartphone bodyguard and spatial memory sentinel, designed to give users ambient peace of mind without compromising their privacy. The Problems It Solves: Misplaced Everyday Essentials: Humans waste over 15 minutes daily looking for keys, chargers, earbuds, wallets, and mice. Existing Bluetooth trackers require buying and remembering to tag every single object. Silent Pickpocketing & Snatch Theft: In cafes and transit, thieves silently slide phones out of pockets or bags without making a sound. Loud alarms cause panic and let thieves sprint away. The Privacy Dilemma: Users refuse continuous camera surveillance because traditional systems stream and store private bedroom and office footage onto cloud servers. How SpatialSentry Works: Continuous Relational Perception: When Camera Guard is active, on-device neural vision automatically identifies items in view and records their real-time spatial relationships relative to surfaces and landmarks (e.g., "mouse on desk beside laptop", "keys on counter beside mug"). Zero-Surveillance Ephemeral RAM Purge: Raw visual frames are held in a rolling 10-second RAM buffer and systematically destroyed every 10 seconds. Only structured text knowledge graph coordinates are preserved. Visual privacy is 100% guaranteed. TARA Conversational Voice Sentinel: Powered by Meta Muse AI, TARA is a hands-free conversational agent following a strict 6-state goal completion machine (FIND OBJECT -> SHARE LOCATION -> OFFER FURTHER HELP -> PROCESS USER RESPONSE -> CLOSE OR CONTINUE). She answers clearly, asks if you need anything else, and gracefully closes with zero awkward silence. The Dark-to-Light Silent Thief Trap: Instead of annoying sirens, users choose a pleasant sound they love (water drop, velvet chime, marimba, or pop sparkle). Every time the phone is taken from dark (pocket/bag) into light, this pleasant sound plays. The user becomes conditioned to it. If a silent pickpocket extracts the phone, the sound plays naturally. The thief thinks it's harmless, but the owner instantly notices because their hands are empty—catching the thief red-handed in the act! Forensic Audit Vault: If an unauthorized grab occurs, Meta SAM 3.1 segments the intercepted valuable and locks a verifiable forensic timestamped report.

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