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Motion Detector

December 21, 2025

More About Motion Detector

Motion Detector is an intelligent, easy to use application that detects motion automatically by using the camera of your device. When you run Motion Detector, you can observe any motion or changes in your camera field of view as camera screen overlays. In addition, you can get motion sounds and can set alarms. Alarms could generate sound, makes phone call where available.
Features;
* Motion Detector automatically detects any motion or change and plot rectangles around them on the device screen.
* Motion Detector draws motion icon on the screen when a motion is detected.
* Motion Detector draws motion history by circles on the device screen. Therefore, you can have information about the complete routes of the targets. Besides, you can see motion towards you or away from you.
* The main problem with motion detection applications is the shaking of the devices during the observation. These yield false alarms. Motion Detector application has specially designed algorithm to minimize this drawback.
* User can set options for motion sound, motion overlay and motion history.
* User can set alarm and alarm period.
* User can optionally save pictures including motion or in case of an alarm. User can also check these pictures afterwards.
* Motion Detector displays motion icon in case amount of motion detected exceeds the threshold set by user. Motion Detector plays motion sound with the volume level proportional to the amount of motion detected.
* Motion Detector raises alarm sound and displays alarm icon in case amount of motion detected exceeds the threshold for a specified time period both set by user. Alarm state goes on for the time interval set by user.
* Live Settings; It consists of subset of setting items that can be manipulated by user during the motion detection operation. Live Settings Dialog is reached by clicking on the Motion Detector Window.

How to use:
* Fix your device by facing your device camera to the area you want to track.
* Start Motion Detector application.
* After countdown motion detection starts.

Settings;

MOTION DETECTION
* Pixel Threshold: Threshold for intensity difference. Smaller values yield more sensitive detection but may cause noise and excess detection.
* Block size %: Percentage of analysis blocks. Smaller block size values yield more sensitive detection but may cause noise. Smaller values yield more sensitive detection but may cause noise and excess detection.
* Area To Trigger: Amount of minimum motion area to take care.
* Save Picture on Motion: Capture picture in case of motion or not.

ALARM
* Alarm: On/Off.
* Alarm Time To Trigger: Motion time period required to generate alarm.
* Alarm Period: Alarm duration.
* Alarm Sound: Enable alarm sound or mute.

DEVICE
* Camera Selection: Allows user to select back or camera where available.
* Motion Rectangles: Draw motion rectangles on the device screen or not.
* Motion History: Draw motion history bubbles on the device screen or not.
* Publish Wifi Messages: Monitor Motion Detector through the wifi network where available. Enables Wifi Publishing for the devices where this service is available. A device with this option checked publishes state information to other devices during motion detector operation.

* Shake Sensitivity: Sensitivity level for device shaking.Motion Detector stops motion detection in case of device shaking, therefore, prevents false alarms. User can select High, Medium, Low or No sensitivity.

Latest Version

Update
December 21, 2025
Developer
Mobile Toys & Tools
Apps
Tools
Platforms
Android
Downloads
856,947
License
Free
Package Name
com.mtat.motiondetector
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Add Comment & Review

User Reviews

Don M

5 months ago

Wonderful. One of the few times I sent $ to give extra tip to developer. A FAVOR PLEASE > what do you suggest I use for my other phone? An iPhone?

Mojtaba Abiri

11 months ago

Although it works nice, however the movement must be so close to be detected. BTW, you can use this app, in addition to some seeds to get wonderful images from birds in the winter

S Smith

3 years ago

Totally useless. The motion alarm has extremely low volume that could never wake anyone and can barely be heard. Video recording of the motion is not possible. Only a single frame picture is captured and the camera snap sound has more volume than the alarm. Why are retarded people designing apps? Is there no one on the planet that has enough sense to design a useful motion detection video recorder that records to one phone without the need of a internet connection?

Ryan

2 years ago

Amending my previous review score from a 4 stars to a 5. I've been using this app now for the past few nights and it works perfectly for my needs. As stated previously, there are a few glitches here and there and the odd thing or two that needs tweaking. But the app is completely free and does what it says, and from what I can see the app is being regularly updated by the developer, who even adds requested features..... for free! How can anyone complain about that?! Thank you developer 🙏😁!!!

Darko

1 year ago

Shame it doesn't capture video continuously as long there's motion, it makes 10 seconds breaks, not like a true DVR. Ok as a concept app and first aid. Set sensitivity to max for best results. Cannot select SD card storage. Filenames date+time would be great, plus timestamp overlays.

Michael Charo

4 years ago

Is not user friendly for getting wifi publishing started thru wifi and on other devices...Plus I had to pay twice and donate thinking it would auto link thru Google account on my other device, it did not serve me..In my opinion Alfred Home Security is more user friendly...1 star rating from me...no proper instructions for remote view on other device thru wifi, even though the app is plain with minimal features!Instead of stars I give it 👎👎👎👎✌️..

Aleksander Orlik

2 years ago

Very useful application. The only problem I have is it doesn't let to add a Polish phone number :-( It would be grate if the application could make calls via IP telephony or from one application to another via internet, sending photos at the same time.

Anthony Steven Fox

1 month ago

can't record video like the old one did, 2 minute videos loads of them by motion

So Geht Das Jetzt

1 year ago

Very promising app! Unfortunately, both alarm and shutter sound don't turn off, even if disabled in the settings, therfore only 4 star at the moment. But a big thank you to the developer team, offering such useful app free of charge. Appreciate your work and effort!

Jose Gallardo

1 year ago

This app does not allow me to zoom in the camera. Therefore, it fails to detect incoming objects that are far away rendering it largely useless, that is my only complaints about this app. It needs to have a camera zoom in feature. Five stars still because it's the only app on the market that I know of, of this kind of app. I want this to ring loud even if one pixel change is detected. I was testing this app and it didn't ring as I was walking past it on a trail, so how is it going to alert me?

He A

1 year ago

Nice work thx! but I having some difficulties: Could it save in webp webm to use less storage? Could we choose destination folder including sdcard, so we could choose what app will sync it with clouds? Could it be less heavy on J7? may be using delayed writing of alert pictures from a queue (if not already), or it could quickly write raw image data and in a low priority thread convert to webp.

A A

1 year ago

Update: Works well as motion detector, but it needs a way to delay the alarm activation while the phone is being set up so that the motion of setting the phone up doesn't set off the alarm. DOES NOT WORK RIGHT! The alarm stays on no matter what. The background camera option does not record videos at all.

Barry Saver

2 years ago

I appreciate the response/update. However, I'm still giving it 2 stars because if you have it running in the foreground, it works, but it still doesn't work in background mode on a Pixel 2. The new version no longer triggers a "Failed to write temp file" error, but no photos get stored.

Earl Wheatley

1 year ago

Nice layout, simple efficient design. Shame not much works. The alarm sound wont turn off even when it's not on in the settings. The picture will not save, again even when it's turned on to do so in the settings. The only image it saves is the small icon in the motion history section. Seems my search is still on for a working security App.

Wroger Wroger

1 month ago

This is good, straight forward, the adds are not intrusive, and I am happy to get the paid for version.

RoN P

1 month ago

motion detector in background just stopped working. Also makes the shutter sound when taking a photo, even if you have the shutter setting off.

Tim Hatton

1 year ago

Outstanding app. I set this up to run overnight with the phone charging. So battery would not go flat and phone shutdown. The photos are named by date and time. If you use the apps gallery and then slideshow . you can see the name of each photo , the date and time, easily. Much faster than opening each photo to read details. If you only need to know when the motion occured the choose motion history, this gives list of times. Really easy.

Ilyas Naqiuddin

1 week ago

The motion detection works but when I try to switch the alarm to my saved files, it kept cancelling my permission

Jean Garnier

2 weeks ago

4.5 stars ⭐⭐⭐⭐✨ Great app. I'd give 5 stars but I'm missing an ability to be able to choose "save location". Also there seems to be a delay in capturing an image after motion detection. I was monitoring outside the house and by the time it takes a picture (fairly slow) moving object is gone.

Daniel Buchanan

4 years ago

Not perfect, but you can't find a better cam to detect motion without net connection. At least I haven't. If your cam is off grid or out of wifi reach, this is the app. Runs in the background too with screen OFF?! If all you need is images when motion sets off a trigger for it, this is your app. Moto E4 working. Don't punish the dev if you can't figure it out lol

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