iTint Menu

Available on AppStore

iTint calculates the Visible Light Transmission (VLT) percentage of an object. Normally used for automotive glass, but can also be used for sunglasses, swim goggles, and camera filters. Yes, this app can even do windows! Measure and record your results for future reference. Need to find a piece of tinted glass to match a home project, but can't remove the glass? No problem. You can measure objects where you do not have access to the edge, unlike some other instruments that cost much more. Shopping for a pair of sunglasses? Why not record the VLT of each pair instead of just guessing the the tint darkness.

As an added bonus, the U.S. state tint laws for automotive glass are included (front side, back side, and rear only). Avoid getting cited for illegal tint darkness. Avoid getting a ticket just because of officer discretion. Great tool for window tint installers who don't want to pay hundreds of dollars for another instrument.

How does this work?

Your iPhone/iPod Touch is split in two sections, where the bottom half is bright white, and the top half is adjustable. Position the bright white section to shine though the glass (only touch the glass with the bottom edge. Do not allow the screen to lie flat on the glass), and the top section above the edge of the glass. Adjust the top section brightness to match the brightness of the bottom. The VLT percentage is displayed in the center top. It's that simple.

Don't have an edge to work with? No problem. Synchronize the brightness of two devices, and place one behind the glass. Adjust the other device on the outside of the glass.

Because not everyone can tell the difference between light and dark the same, there are helper side bars that step a different percentage to aid measurement. Use in landscape mode for even more transition steps.

The optional calibration can greatly improve accuracy. You may purchase sample reference tints from Ridout Plastics using this link here.

You can practice matching brightness levels using the iTint Lite app available here, or in the full version of iTint.

Click here for details on how to use the app.


This tool is not certified for accuracy since the calibration (your eye) is subjective. To properly measure VLT% the entire visible light spectrum must be used, this app only measures one wavelength. Screen brightness varies on different devices, and may not be linear. Your results may vary from the actual VLT%.

All information in the U.S. States tint laws are from the International Window Film Association (IWFA), and are subject to change. Please consult your local state laws for detailed information. The U.S. Department of Transportation requires a basic 70% VLT on windshields. No states allow tinting of the front windshield, except for parts of the top. The information on the front windshield is not included in this app.

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Available on AppStore

iTint Lite

iTint Lite (Demo)

Available on AppStore

Purchase Reference Tint Samples