iPhone Screenshots


Duet Alarm is an intelligent geofence alarm that is built to smartly alert you of various location based events. Some typical examples are:

* Wakes you up to get off train no matter it's earlier or delayed.
* Shows you the current traffic around alarm area when you leaving home so that you can choose the less traffic route to take.
* Warns you when entering an area where extra caution is required, such as high-crime, dangerous-corner, speeding cameras, ticketing-traps etc.
* Delivers oncoming bus predictions automatically whenever approaching the stop.
* Reminds you to visit preset POIs when touring a new city.
* Reminds you to take a picture of where you parked before leaving the huge parking lot where you often got lost.
* and many other things or events that are location related...

It's designed to be extremely prudent on energy consumption - typical users would find via the settings app that Duet's battery consumption is just about 1% for 24 hours.

** Do NOTE that Duet Alarm doesn't work well on iPod or iPad models without GPS capability. **

Features & Tips
* It's the only geofence app that has built-in predecessor for you to mark a start-of-trip event. e.g. You may set the boarding stop with a preceded flag so that the alarm for disembarking would only be triggered if you were coming from the boarding stop. This shall prevent unwanted alarms if you were just passing by.
* The app can be set to repeat with a 2nd-alarm 30s after the initial one. And each accompanied by up to 6 intense vibrations to ensure you are well alerted. There are various built-in sounds to choose as well.
* The zone radius can be adjusted easily by tap-and-holding on the black-dot-handle.

DISCLAIMER: Duet is designed for helping daily commuters with priority tweaked towards energy conservation over accuracy. IT IS NOT SUITABLE for use with any mission-critical tasks. By downloading and installing Duet app, you agree THAT USE OF THE LICENSED APPLICATION IS AT YOUR SOLE RISK AND THAT THE ENTIRE RISK AS TO SATISFACTORY QUALITY, PERFORMANCE, ACCURACY AND EFFORT IS WITH YOU.

If you have interest or requirement to creating one geared for mission-critical use, please feel free to contact the developer for further discussions. Continued use of GPS running in the background can dramatically decrease battery life.

What’s New

Version 1.11.5

- bug fixes

Ratings and Reviews

1.0 out of 5
1 Rating

1 Rating

Arkayar ,

Intrusive ads

I'm all for ad supported apps, but this is ridiculous. Unusable.

Create nickname312 ,

Functions well and quick support

This app works for helicopter patrol use for proximity alerts. The support team is also very prompt and helpful. The interface was easy in order to tailor it to my need


Idemfactor Solutions Inc.
53.2 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
This app may use your location even when it isn't open, which can decrease battery life.
In-App Purchases
  1. "Remove Ads" $1.99
  2. "Duet Pro" $6.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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