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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

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

Ratings and Reviews

1.0 out of 5
1 Rating

1 Rating

JuliaWillDesign ,

Crashes On Opening!

I just purchased this app and I can't even open it. It crashes EVERY time, even after restarting my iPhone. PLEASE fix!!!

Developer Response ,

There was an update from Apple during this timeframe and the app had to be revised as a result.

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


Lori Sawaya
21.9 MB

Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2014-2016 The Land of Color


  • Family Sharing

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

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