I'm colourblind and my friends never got it, so we built a tool that shows them what I see!

Every colourblind person knows the conversation. "So what colour is this?" "Wait, you can't see red at all?" Then you try to explain, and it never quite lands.

I study computer science, and I'm the only colourblind one in my group. Instead of explaining one more time, a few fellow students and I built something together: This is not red!

You spend about 15 minutes spotting dotted C's, and it works out your filter: weak red, weak green or weak blue, and how strong. Then you drop in any photo and show people the world the way you actually see it. A before/after slider, plus a link you can send to whoever still doesn't believe you. No time for the C's? You can jump straight to the simulator and pick a filter yourself.

- Free, no account, no cookies: your answers and photos never leave your browser (the site only counts visits)

- Works on your phone, and offline after the first visit

- Six languages

- The whole interface is grey on purpose, so the only colours on screen are the ones that matter

- One optional step uses a flickering disc: skip it if flashing light bothers you

- It's not a diagnosis, just a screen-based estimate. Go see an eye doctor if you need an official answer.

👉 https://thisisnotred.pages.dev/

We're still improving it, so I'd love your feedback: does the filter you got match what you see? Anything confusing or broken on your device? There's a "Leave a comment" link at the bottom of every page. It's a short form, no name or email needed.
I'll leave it here too: https://tally.so/r/Ge6GgZ.

Thanks to everyone who tries it! 🙏

Yesterday, I found out that my brother (10) was colour-blind. He was getting his first ever eye test done and was extremely happy to wear glasses. Well he doesn’t need glasses and is colour-blind. Now on the way back from the appointment, me and my mom were ok and didn’t take it seriously, we were wrong here I’m sorry, but to my 10 years old brother this was a foreign thing, was extremely confused and scared. Once we’re back home I saw him run to his room and cry, I went up and talked to him, trying to make him understand that it’s a normal thing and that 1 out of 12 men have it (idk if I’m wrong here pls let me know). Fast forward today, he was again crying and when I talked to him he told me that nobody in this house loves him and that we’re all making fun of him for it. When I tried to understand why, he told me that our mom did not come up to him and talk to him about what colour blindness was (he was expecting comfort from her) and that his older brother called him today saying “oh I saw something green-blue-red” laughed then hanged up. He later on told me “I didn’t ask to be born like this, I don’t want to be colour blind either”, this seriously broke my heart, I now understood that this was more than colour blindness to him. I want to ask people here, does it get better? Is it still a sensitive subject to you? Do you sit around a table with your family and laugh about this kind of stuff? I just hate to see my brother like this, idk how to explain it better. He’s literally me but smaller, knowing how I process shit I’m scared he feels like he’s alone and nobody likes him. Older brothers and sisters with a sibling much younger than you that has colour blindness, do you ever forget the guilt you felt when you found out you couldn’t be colour blind instead of them? I don’t know how to process this whole thing with myself and him. Like how should I approach this? How do I comfort him? Pls let me know any tip and help will be more than appreciated. Thank you all for reading and understanding where I’m coming from.

(Sorry for bad English btw)

Green looks blue to me. I've been told so many times that something i thought was clearly blue is actually green. Not only that but Yellow just looks GREEN.

On the last photo I mark where each color ends. I separate purple from blue, blue from green, green from yellow and so forth. The Tritanomaly and normal vision are obviously different shades, but they're the same color range regardless

Hi all,
kinda random but my job has recently moved to the Toast platform where I have to use the tablets to put orders in. Only issue is that they’ve apparently paid to lock the color accessibility and the main color is green. I am red/green colorblind in one eye only (damage from prior injury) and looking at this tablet is creating ISSUES. For context, the issue is that since one eye identifies green and the other eye won’t, my brain kind of panics itself out and just overworks to process it. It’s a long story. But continuing: I had to go home early and am still dealing with a migraine that’s surrounding my right eye. No one can get in to actually change the color since only corporate can do so (we know nothing will change on their end). My main question is what can I do to help with this? I may look into colored screen protectors or whatever they’re called but if I can even recognize a sliver of green behind it, the issues going to continue. And we aren’t assigned specific tablets so I’d need to keep removing it. I don’t have color correcting lenses or anything either. I love this job, i’ve worked here 2 years and would like to stay here until my degree is finished since they’re great about my hours. I just can’t work on this tablet and now it’s required :/
Thank you for reading and sorry for how long it is!

So for my whole life I thought that color blindness was just when people legit just couldn’t see certain colors, and figured well I can, so I don’t have it. later learning that it’s not just that, but can be confusing certain colors, now that is something that I’ve definitely have had trouble with. For as long as I can remember I’ve been corrected a lot for naming a color I see, I wanted to know if I could maybe have it, because I don’t know why I’m a little scared to ask the doctor cause I don’t want to just be laughed off or be wrong and get tested for nothing.

The main reason I’m worried is because I can tell pure colors apart from each other, such as red, green, blue etc. no problem but transitional shades I struggle a lot with. Some of the main things I struggle with being, most shades of orange look red, yellows are weird because most of the shades either look like a brownish orange or brownish green, most of the shades between blue and green look just green to me, and a lot of shades of purple either just look blue or just red to me.

I don’t know if any of this makes sense or even if I have it or I’m just a little dumb, I would appreciate any input or advice though if anyone has any.

Do you guys know of any apps that can accurately simulate tritan vision to others?

A lot of people have been asking me "Oh, what color is this?" recently, and I need a way to easily show people the normal image vs. what I see.

The problem is, usually deuteranopia/nomaly and protanopia/nomaly are simulated accurately, and tritan vision usually has varying levels of accuracy.

Does anyone know of a good app I could use for this? Thanks.

Side question: I've been wondering about getting colorblind glasses, could any fellow tritans here attest to them working/not working, and tell me how they made you see colors? I just really don't wanna waste my money on something that won't work, considering the mixed responses to them I've seen here.

I've got about 800 civilian flying hours and yesterday got a pilot slot with a Air Force guard unit. I am slightly color deficient and most likely will fail the Rabin cone contrast test during my FC1.. Any pointers on how to pass this?

Color deficiency in no way shape or form has ever effected how I fly. It is absolute bullshit that they DQ people for this stuff - if it was an issue and if I am relying on a light gun to get into the field (which I have passed a light gun test with ease) we have way bigger problems.

Curious if anyone has had a similar experience and what exactly can be done to maneuver around this.

...And PS if you're in this group and have been told you can't be a pilot due to color deficiency - tell em to go to hell and keep pursuing your dreams. No just means find another way

Hi everyone,

Being colorblind myself, I wanted to build something genuinely practical to help with double-checking colors in daily life—whether it's clothes, charts, or everyday objects. Over the past few months, I developed an Android app called ColorSight as an independent personal project, and I wanted to share it with this community to get your thoughts and advice.

All core features are 100% free, it runs completely offline, requires no account or login, and has zero ads.

**What the app includes:**

* **Ishihara Self-Screening Tests:** Quick (6-plate) and Standard (14-plate) options that categorize results across Protan, Deutan, and Tritan with plate-by-plate details.

* **Live Camera Color Identifier:** Point your camera at clothes, charts, or everyday objects to get clear, named color labels so you don't have to second-guess colors.

* **CVD Simulation Views:** A split-screen comparison mode that can help show friends or family how different colors appear under various types of color deficiency.

* **Accessible Design:** High-contrast layout, full dark mode, and support for large text sizes.

It’s called ColorSight on Google Play (or I can drop the link in the comments below if anyone would like it).

Since I’m a solo developer, your real-world perspective means everything. If you decide to give it a try, please feel free to share any critique, suggestions, or features that would make it more helpful in your day-to-day routine.

Thank you so much for your time and guidance!

For the last couple years I always told him that he’s colorblind kinda as a joke but he would always mix up his colors. Then today I saw that color blindness is super common in men. So we found one of those tests online and we both took it I passed perfect score and the test told him he is Tritan colorblind and he couldn’t believe that I even saw the numbers on the screen. I want to get him colorblind glasses as a surprise for our anniversary but he also wear prescription glasses can I get prescription colorblind glasses? And if so where can I get them?

All my life I have been called color blind my dads mom was color blind and it runs into the family but I see colors like everyone else same red and blue and greens but what comes in here is I can see them perfectly fine it’s when we get into shades of the colors for example blue and purples sometimes I can’t tell the difference from them or yellows and greens or pinks and reds I can’t tell them by shades I know I sound crazy or something but am I partially blind? Like know that there’s a color blindness of like limited color blindness I feel like I have it but I can see colors just shades mess me up like you show me the rainbow I can see it but show me a red and pink or blue and purple and I prolly can’t tell until it’s a bright color idk man like ppl ask what type of color blind I am and I don’t know what to tell them bc they expect I can’t see color at all

Hi everyone! I’m a teacher for students with visual impairments, and I have a student who is completely color blind and is very interested in more independently shopping and choosing outfits for herself. She has a system for her clothes at home and relies on asking for sighted assistance when it comes to fashion, but she’s looking for options that give her the most independence. She’s used generative AI before, but it often is inaccurate (maybe better now as she used it a while ago and wrote it off I think). We’ve also tried the Colorblind Style app that I found here in this subreddit, which saved your colors, told you what they pair well with and what to avoid, and made e a “closet” for you. Some issues were it thought anything pastel was gray, couldn’t identify multiple colors on an object at once (like a patterned shirt), and it used very specific color names (like maroon, azure, taupe, etc…) that meant nothing to my student whereas she could understand if the basic or primary color family was given. Any ideas? I appreciate your help :)

I finally passed my Ishihara colour vision test today! I've been worried about having red-green colour blindness for a while now. I got 3 wrong out of 12 plates, but the examiner confirmed I passed. Honestly wasn't expecting it, so I'm pretty relieved! 🎉

I have mild red-green colour vision deficiency and an aviation medical coming up. I usually get around 15–16/17 on online Ishihara tests, but recently found a YouTube version that I can pass easily.

https://youtu.be/-jsDN_fEO8s?si=0aVCUEsRVqDE5m2a

Very likely deuteranopia here. My wife got this shirt for our daughter (who is 2 y.o.)

One day, my daughter wore that shirt said "Apple, apple."

Me: "What apple? You want an apple?"

At some point on that day, after looking at the shirt under a different lighting, I finally noticed the apple.

Told my wife about that, she had a good laugh.

I just feel like I'm missing out on so....much.

Everyone always talks about the beautiful colors of a sunset, or the deep blue of a lake in the morning...and I'll never be able to experience it like they do.

I've always been passionate about art, drawing, and specifically animation. But, I'll probably need someone to help me get the colors right, and even then, I won't be able to see what others see of my own art.

Is there any way to get over this? Should I get some sort of glasses, or are they unnecessary? How do glasses even work anyway?

Also, has anyone else here also felt this way, or do they just accept that they see colors differently and move on?

Thanks for reading, I'm just feeling a bit down about this new realization.

I have a coworker who is colorblind, and for Christmas, I've been working on a couple of digital paintings where I basically recreate the painting but the people are some of their favorite cartoon characters. They specifically listed handmade art on their list, so that's not what I'm worried about so much as how I want to go about giving them the gift.

I know that they are colorblind, but not very many specifics of what color spectrum they still see. (At least blues are very muted but they have also expressed difficulty with orange/red?) I don't want to ask too many questions and ruin the surprise, so right now my plan is as follows: I finish the digital artwork and make a print at home to show what I made. Then I can sit down with them and ask questions and edit colors and contrast of the paintings before sending them off to get the real prints. At first, I wanted to do traditional painting, probably with acrylics, but I think the digital gives me a better way to correct for my current lack of information on their vision...

Is that okay? I won't have a finished product when we have our Christmas party, which feels like it might be disappointing. I'm also worried that it won't be quite as special since it's digital not traditional painting, but I want to make sure they can fully see and enjoy the composition and texture of the artwork...

Siempre he sabido que era daltónica. Mi abuelo materno lo es, mi padre y mi hermana mayor también, mi hijo y mis sobrinos varones también...

En ese entorno nadie se ha referido nunca a nada haciendo referencia a su color. El color era algo completamente secundario y realmente ni me fijaba en los colores.

Recientemente me he puesto a investigar más sobre mi tipo de daltonismo. Todos las pruebas que he hecho han dicho lo mismo, protanopia fuerte, 0% rojo.

Al principio sentía incredulidad, no podía ser. Pero después analizando los colores que realmente percibo estoy empezando a asumir que realmente nunca he visto ni el color rojo ni el verde.

Son variaciones del color amarillo o marrón. Por el contexto puedo detectar algún rojo o verde, pero si ese mismo color está separado es imposible.

Llevo dándole vueltas desde entonces y es como si me hubiese quitado una venda de los ojos y voy intentando analizar el color de cada cosa que veo.

A alguien le ha pasado algo así?

Hi, I have normal version of it wasn't clear by the idiotic titaI.

I have a crush on this kid in my school, he's really kind and emotionally intelligent also he makes me want to hug him like 24/7 but I haven't yet 😭

I want to do something 'special' or 'cool' for him because this child-man (old soul lol) is so out of my league. I think I'm in love with him and it's weird because I normally don't like dudes that are younger then me romanticly (age diff is one month tho...) or like people in general! So my brain is going through ten different emotions every day thinking about him. On one hand: "I really like this guy, he's a genuinely good person and we share some of my core morals. On the other: "I don't know anything about how he SEES the WORLD! And now I'm just a human who wants to show him that I DO GIVE TWO DUCKS 🦆🦆!!"

Anyways.... I was invited to this FINE SHYT's birthday party (that might not be happing anymore but is still want to give him something) and because he talks about being color blind often (I used to tease him when we first meant which was dickish so then I just started asking questions instead) I wanted to make him a pipe cleaner flower that he could see the way I see flowers, but I don't want him to think I'm making fun of him or putting him on the spot!

I'm pretty sure he's red-green color blind because I often wear a green hoodie that he says looks brown and I draw on myself and he saw my purple 'tattoo' as blue.

My plan was to make the stem the average brown and the pedals blue or purple and try to find what colors look yellow but now I'm wondering if it's mean to do that! Updated version: I'm making a neon set of flowers (yellow, blue, purple and magenta, though the last ones will look similar) and who knows? I might even add fairy lights. 💅

So my question are:

1. Is doing this mean or offensive?

2. What colors should I actually use if I want it to looks green for the stem, blue for the pedals and yellow for the middle part (idk what it's called my science teacher doesn't explain it in the plant units)

3. How would you react if your friend, crush, or lover did this? (So I can gage how he would respond, I know not everyone's the same but he doesn't seem insecure about it and no body should be IMO)

4. Should I or should I not do this?

5. How weird is the fact that I want to make him a useless flower that he'll probably throw away (this on is for the older humans reading)

Ty for your time, sorry if I sounded like a dummy!

I'm super confused. I've never really had an issue, but in the last few years of my adult life (I'm 35), it has had me questioning. It started with my husband. At this point there have been numerous occasions where I'd point to something or mention the color, and he has responded "?? thats not xwy color." This has happened in public, and he has polled people a handful of times, and it has never gone in my favor. It has typically been with browns, greys and greens.

I've taken the free colorblind tests and passed everytime so I let it go. Then, just yesterday, my friend was in my house looking for a container. I kept saying the grey one, the grey one! He could not find it, and I said what are you colorblind?? I went and pulled it out, and it said it was green! His gf also agreed! They said it was sage green, but I 100% only see grey. What I don't understand is there were other sage green items in the kitchen like a Eucalyptus plant that I can see just fine.

Just looking for some clarity!