Ingrid Perri, a life coach in Melbourne, Australia, discovered she was mildly colorblind at age 47.
Other apps, such as HueVue and Colorblind Helper, assist with matching or harmonizing colors.
Apps such as Colorblind Avenger let people do the same thing through smartphone cameras.
"I think my father's vision was that we should at some point have a colorblind society, " he says.
Colorblind users may also want to check out another, free app that offers real-time imaging called Chromatic Glass.
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's "I Have a Dream" speech, in which the civil rights leader outlined his vision for a colorblind society.
In addition, the IrisPen is somewhat colorblind: It doesn't recognize red or any but the darkest shades of blue.
Two generations later, her son, John, was denied a chance at an ROTC scholarship because he is colorblind too.
Like many people who are colorblind, John Bolt says other people find his condition more interesting than he does.
"A colorblind person who can't see red can't see the red in purple he just sees blue, " says Dr. Neitz.
Many colorblind people say they have no problem recognizing pure, strong colors.
Some tools, like Colorblind Vision, help businesses and marketers see what their materials look like to colorblind people by simulating various color-vision deficiencies.
Some popular videogames, such as PopCap's Peggle and Zuma Blitz, now let gamers switch to colorblind modes, where color codes turn into shapes.
Colorblind in a world still struggling with issues of racial and ethnic strife, he tried to "heal the world" and bring people of all backgrounds together.
Leveaux then decided not to be colorblind about the cast, concluding that Juliet's parents must be black and Bloom must come from a white household.
When it comes to choosing my friends, I am still colorblind.
Many colorblind people aren't even aware they have a "color-vision deficiency, " as it's officially known, unless they apply for a job that requires precise color recognition.
Advocates for the colorblind say the world could be more accommodating to the nearly 10% of people who have trouble seeing shades of red and green.
What does a deaf person make of "The Silence of the Lambs" without the soundtrack, or, for that matter, what does a colorblind person make of "cheeks like roses"?
Users look through the phone's camera and the program converts all the reds and greens in view into pure, basic versions that are easier for colorblind people to see.
The vast majority of colorblind people have trouble seeing red or green, due to a genetic defect in the color-sensing cells, called cones, at the back of the eye.
The most basic one, HueQuantize, exaggerates both red and green and moves them further to the extremes of the color spectrum, away from the indistinguishable middle ground where colorblind users get stuck.
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But most scientists still maintain that your "red" is probably the same as "red" for everyone else (who's not colorblind) in terms of what you see, the University of Illinois' Hilbert said.
We don't know about you, but we're not colorblind when it comes to our home theater gear, and we pretty much only want black, silver, or other dark colors in our equipment rack.
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To help colorblind users in the trading world, Bloomberg financial-data terminals include plus and minus symbols or up and down arrows to indicate the direction of the market or stock price, says a spokeswoman for Bloomberg LP.
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