LED Light Flicker Meter

Contechity AB

In-app purchases

About this app

Have you experienced eye strain, headache, migraine or other symptoms from being exposed to flickering lights or screens? Use this app to measure which lights or screens are flickering and how much and which are flicker-free!

This app measures flickering of light that are flickering/blinking so quickly so that we cannot usually see it with our eyes. But it can still have a negative affect on us - eye strain, headaches, migraines and even epilepsy seizures are reported as consequences of flickering lights. With this app you can measure if your LED lamps, LED bulbs, fluorescent tube lights and screens are flickering and how much.

How to Use the App?
Place the phone in a position so that the camera is facing a surface, such as a white paper, an evenly colored wall or a floor, that is lighten by the light source you want to measure the flickering from. It is very important to let the phone stand still during the measurements as movement can cause the meter to measure a too high flickering value.

What is a Flickering Percentage?
The percentage flickering is the apps estimation of the difference between the maximum and minimum light output from a light source. A flickering measurement value of 25% means that the minimum light varies between 75% and 100% light output. A light that switches off completely in each cycle will have a flickering measurement of nearly 100%. A light that does not vary in light output will have a flickering measurement of nearly 0%.

How Accurate are the Measurements?
As long as the phone during measurements is standing absolutely still, without any movements and are directed towards an even surface, the accuracy seems to be within plus/minus five percentage points under normal circumstances on most devices.

The app now supports 40 different languages.

Free for a Limited Time
Enjoy full functionality for a few weeks. Afterwards, a one-time fee or subscription is required.

Contact
I am always interested in hearing from you. Feel free to contact me with questions, complaints and improvement ideas. I try to answer all emails.
[e-mail]

Ratings and reviews

It is a great little app! As far as I can find the only one that does this. Bulbs that I would not expect to flicker, incandescent bulbs actually flicker some, according to the app not enough to worry about, while some "fancy" LED bulbs that advertise to be flicker free are in fact flicker free. It is a good tool to help know what products on the market live up to their claims and which do not. Thank you for the great app!

It's a great app to detect LED light flickering, especially when you're choosing the right lights in a lighting store. Initially the detected flickering frequency was dramatically different on a Samsung phone vs on an iPhone, for which the author got back to me and guided me to calibrate. After calibration, the results are the same. So if you also encountered the same issue, just tap the gear icon after the hertz value with a small question mark and calibrate as instructed.

I don't own a separate hardware device to confirm the flickering, but this seems to reflect the specifications of the monitors I've used it on. The ones that are advertised as flicker free show up as low flicker, and the ones that do not have that flicker free designation have a higher flicker. For what it's worth.

What’s new

• Made it clearer in the main tab that frequency measurement requires calibration to return a value in Hertz.
• Misc minor improvements.

These improvements were suggested by users. Got an idea too? Share it in a review!