Your phone knows when the door opens.
DoorWatcher uses your iPhone's built-in barometric pressure sensor to detect when doors open and close in real time. Turn any iPhone into a security system.
What People Are Saying
“I left DoorWatcher running overnight and it caught my roommate sneaking in at 3am. The pressure detection is insanely accurate.”
How it works
Your phone already has the sensor.
Every iPhone has a barometric pressure sensor. DoorWatcher uses it to detect the tiny air pressure shifts that happen when a door opens or closes. No extra hardware needed.
It learns your space in 30 seconds.
A quick training phase lets the AI learn your environment's baseline. It adapts to your home, distinguishes interior from exterior doors, and filters out noise automatically.
Know the moment it happens.
Get push notifications and haptic feedback the instant a door opens or closes. See event type, pressure change magnitude, and whether it was interior or exterior.
A full alarm system. On your phone.
Activate Guard Mode and your phone becomes a security system. A 5-second warning tone followed by a full alarm. Pair with HomeKit to trigger lights, locks, and more.
If the door moves,
you'll know.
What you get
The free version is a fully functional door detector. DoorWatcher Plus unlocks the full security system.
- Real-time barometric pressure monitoring
- Automatic door open/close detection
- Interior vs. exterior door classification
- Push notifications on detection
- Live pressure charts with event markers
- Event log with timestamps and pressure data
- AI-powered training and auto-recalibration
- Guard Mode with escalating alarm system
- HomeKit integration - trigger lights, locks, and scenes
- Multi-home support for multiple properties
- Custom alert rules and quiet hours
- Session data export and sharing
- Extended event history and analytics
- Priority support
Privacy first
No cloud. No servers. No account. Everything stays on your device.
Zero data collection
All pressure readings, event logs, and detection data live on your iPhone. Nothing is ever uploaded anywhere.
No account required
Open the app and start monitoring. No signup, no email, no phone number. It just works.
No internet needed
DoorWatcher works entirely offline. Detection, alerts, and Guard Mode all function without WiFi or cellular.
Open and transparent
Built by a small, independent team. No investors, no ads, no data mining. Subscriber-supported development.
FAQ
Common questions
Turn your iPhone into something it was never designed to be.