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Use LRV Guru to get LRV (Light Reflectance Values) and LCh° (Lightness, Chroma, Hue Angle). Works in conjunction with the Color Strategist Color Wheel to show hue family.

P L E A S E -- R E A D -- B E F O R E -- Y O U -- B U Y!!!

Use this app for LRV and LCh°. LRV is Light Reflectance Value and LCh° is Lightness, Chroma, and Hue Angle which means you can download The Color Strategist color wheel and determine what hue family a color belongs to.

How It Works:

LRV Guru™ app can be USED ALONE to calculate known LRV value differences.


LRV and LCh° are displayed via the "Compare" option from the menu.

LRV Guru™ app MEASURES Light Reflectance Value (LRV) when integrated with Variable, Inc.'s Color Muse hand-held colorimeter.

The spectral data captured with the Color Muse and the values and/or ratios ascertained using the LRV Guru app are reasonably informative guidelines - "in the ballpark", as they say.

Beyond reasonably informative guidelines would require certified measurements from a color lab.

NOTE: You cannot take a picture of a color with your smartphone or camera and ascertain LRV. A picture of a color is just a captured image, it is NOT A MEASUREMENT! To MEASURE LRV using this app, you must use a Color Muse or NODE+Chroma hand-held colorimeter.

FEATURE: You can adjust the contrast ratio. LRV Guru's default contrast ratio is set at 70% because it is the most commonly applied guideline. A significant bonus feature of the app is that the contrast ratio can be adjusted by tapping "settings" and positioning the slide bar as desired.

What’s New

Version 1.3.2

This app has been updated by Apple to use the latest Apple signing certificate.

LCh° values are now displayed for scanned colors.
Minor bug fixes.

Ratings and Reviews

3.0 out of 5
2 Ratings

2 Ratings

HappyFace616 ,


This works perfectly with the Node. So useful and I spent at least an hour going around my house finding the LRV value of random things, the dogs, my wall, my shirt, a mirror of all things, anything I could scan I did totally worth it. This is just an all around great app, I was vary impressed. I definitely recommend this awesome app.

The new version works wonderfully, great job on the app!

Kellgon ,

Great idea!

Love the LRV Guru app idea, but it is not connecting my iPhone to the Color Muse. I have the latest update and latest operating system upgrade. Is there a fix? Update: Thanks for your response! After fidgeting a bit, I was able to connect to the Color Muse. It's very helpful to be able to take LRV measurements on the spot. Highly recommend!

Developer Response ,

New version 1.3.2 released July 2017 fixed a bug that could cause the app to stall or not connect at all to the Color Muse. Apologies for any inconvenience! ~Lori

Ralf_Zak ,

Very Powerful!

No crash issues since updates. This is the perfect app to calculate contrast between two colors using LRV numbers supplied by paint and materials manufacturers. I also use this app with my Color Muse from Variable to measure LRV. Getting color to do what you want just got a whole lot easier!

App Privacy

The developer, Lori Sawaya, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

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

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