Sentinel Circle app icon

Sentinel Circle

Know they are safe.

Alerts caregivers by SMS, phone call, email and WhatsApp when a person with dementia or Alzheimer's leaves home — using WiFi and Bluetooth already on your phone. No GPS, no wearable, no monthly fees.

Free 30-day trial · one-time purchase, no subscription · Android 6.0+

Five sensors

WiFi, Bluetooth, email, notifications, or an unrecognized-device watch — pick what fits the home.

Seven alert channels

SMS, phone call, email, WhatsApp, on-device alarm, sound and vibration — all at once, retried automatically if one fails.

Privacy first

Everything stays on the device. No accounts, no ads, no analytics. Nothing is sent anywhere except the alerts you configure.

Built for dementia care

App lock so the monitored person can't stop it, adjustable debounce timing, and a screen saver for kiosk-style phones.

Example: two phones, one alert chain

One possible setup: a phone left at home watches a Bluetooth tag the person carries and emails you when they leave — it needs no mobile plan (no SIM or eSIM), just the home WiFi. A second phone, in your pocket, watches for that email and sounds an alarm.

Available in 30 languages

Follows your phone’s language, or pick one in the app
  • English English
  • العربية Arabic
  • বাংলা Bengali
  • 简体中文 Chinese (Simplified)
  • 繁體中文 Chinese (Traditional)
  • Čeština Czech
  • Dansk Danish
  • Nederlands Dutch
  • Suomi Finnish
  • Français French
  • Deutsch German
  • Ελληνικά Greek
  • हिन्दी Hindi
  • Magyar Hungarian
  • Bahasa Indonesia Indonesian
  • Italiano Italian
  • 日本語 Japanese
  • 한국어 Korean
  • Norsk bokmål Norwegian
  • Polski Polish
  • Português Portuguese
  • Română Romanian
  • Русский Russian
  • Español Spanish
  • Svenska Swedish
  • ไทย Thai
  • Türkçe Turkish
  • Українська Ukrainian
  • اردو Urdu
  • Tiếng Việt Vietnamese

See it in action

Live status, configurable sensors, and a full-screen alert that's hard to miss.

Sentinel Circle status screen showing live monitoring state Sentinel Circle sensors list showing WiFi, Bluetooth, email and notification sensors Sentinel Circle full-screen alert shown when a monitor triggers