Show HN: Draw a fish and watch it swim with the others
drawafish.comMade this website as an exercise in vibe-coding and GCP. It was posted about a few times around the internet, on sites like [Morning Brew](https://www.morningbrew.com/issues/business-buzzkill), [MetaFilter](https://www.metafilter.com/209703/Draw-A-Fish), boingboing.net, etc. I think it's cute!
I built a basic CNN trained against penises and swastikas, and then anything that doesn't hit the 63% confidence score gets sent to a mod queue, a [vibe-coded fish-tinder](https://bsky.app/profile/bigass.bsky.social/post/3luvikxn3f2...).
Was a fun exercise, spent about a month on it. Frontend is HTML5 hosted on github pages, backend is Node.JS on GCP. The leaderboard is fascinating. Some people are clearly putting a lot of time into this, while the rest of us are trying to sneak phallic shapes past your CNN. 1. https://drawafish.com/rank.html?userId=1753510318634_cdeh6a4... I am literally trying my best to draw a fish only to be told it is only 30% likely to be a fish. Cruel. Got a potted flower through. It's swimming nicely https://drawafish.com/tank.html?capacity=55&sort=popular also don't sleep on that one That makes me feel better about my fish, I thought it was among the worst, but good to know it atleast qualified. My hot dog with a smiley face got a 64%, I'm sorry. Semi relevant Silicon Valley clip (maybe nsfw, language) Well what's the difference between a lamprey and an hot dog? It's mostly down to the casing. Also make sure you’re filling up the canvas — don’t draw something too small. Did it face the right way? I could dedicate a month, or a year, and never come up with something like those. Are they really using the site tool, or is there a trick to draw them elsewhere and import them? Those are truly amazing! If you have a tablet and some artistic background, these are all definitely doable. Doing those with a mouse would be a lot harder. I like to draw with a mouse. Just takes practice, like anything. What if your mouse was shaped like a pen? It would be hilarious if that guy vibe coded a thing that’s just repeatedly googling images of real fish and then slavishly drawing them into the site. Pretty sure you can build a "robot" that just copies from an image source. I was extremely happy with my 60% Wang fish. And now after looking at the leaderboard I feel bad. I drew a real triumphant one that edged over the 60% threshold. Then read that the mod queue was at 63% and had to do it all over again. Ok there's some sort of bot war going on with the leaderboard, right? The Palestine fish has 370,000 votes total (both up & down), which seems like a lot. Does HN really drive that kind of traffic?? Well you can click thumbs how many times you want so ... The rule of thumb is 100*upvotes+50, so with the current 600 points, it's like 60.000 visits. Don't take that estimation too seriously, it's only a not so bad initial estimation. OP really needs to read "How not to sort by average rating" https://www.evanmiller.org/how-not-to-sort-by-average-rating... you can also upvote your favorite however many times you want! Are people actually drawing these in the browser, or is there some extension that lets you populate a canvas with something you did with a stylus in Photoshop? I’m browsing hn on my iphone, clicked this link, drew a fish with my finger, and saw it Worked out the box didn't think twice of it Good point though as the site doesnt follow responsive design patterns I drew it with the mouse, doable bit you can use your ipad You could also just load up the website on an iPad with an Apple Pen. Unfortunately, that did not improve my drawing skills over using the trackpad. At all. :( Looking at those I feel my fish was totally inadequate. The first one didn't even pass the autofilter since it had a stick figure face ... Really nice toy! The major problem is that I could up-vote and down-vote as many times as I want. It is rate-limited, however[1]. I know, because I wrote a script. :D Seems like someone else did, too, except to down-vote. Please fix it. Edit: these down-votes are going down by the 100s or so, someone is really bullish to have "RiverToSea" fish down-voted. Ironically, the "RiverToSea" fish was made by someone who named himself "f**k palestine". [1] After refresh, you can continue voting till you reach the limit, which is problematic. I've always thought it was MORE democratic that if you really like a fish you should be able to upvote it more than if you just kind of like it You may potentially be able to learn a lot from being able to successfully fight against people doing automated voting ad infinitum. :D Now I understand why it rates my doodle as 7.5% fish probability. spazzchainsaw has a talent. The website is great! > I built a basic CNN trained against penises After seeing it in action, my second thought (first was just watching my fish) was that I was amazed at the good behavior of the users because I would have expected a lot of penises floating around. Now I understand. Nicely done! Actually most people aren't trying to submit bad fish! I was surprised to, it's really like 95/5 good to bad submissions. People seem to follow the rules on average :) Yeah, there’s two rules that define the internet: 1. 95% of people will not be trying to draw penises 2. 5% penises by volume is a lot of penises By volume, yes, but by mass, it's a pretty reasonable load Perfectly average, I’d say Or roughly average, as your username would say. :D To be fair, you stop them from submitting the bad fish before they have a chance. I never submitted a fish that wasn't already 'green' for % When I launched Twiddla, it was so common that we joked about adding them to the shape tool. I think it’s just human nature that that’s the first thing you try to draw on any online whiteboard. I tried to draw an eel, and when I was done I realized that all I'd done was draw a very orange, toothed penis. is this a reference to the new South Park episode? (sorry) >is this a reference to the new South Park episode? I don't think so, he said "long" lol Haha, not intentionally! There are some fish decorated with swastikas floating around And a Star of David Edit: And a lot of Palestinian flags when sorting by popular. Just noticed "Chosen Fish" on the leaderboard - sometimes it's a bit less subtle. As hard as I tried to add fish characteristics, it knew what I was doing. I wonder if it's resilient against swastikas made of penises. That was the Slack logo redesign. My hot take is that the Slack logo is an Alphabet-product logo. The colors aren't quite right, but it's red/yellow/green/blue like an Alphabet logo. It would fit right into the lineup. It's particularly similar to the (obsolete) Google Podcasts and Google Photos logos. My pet theory (that I don't sincerely believe) is that this was deliberate to help smooth a hypothetical acquisition by Alphabet, before they were bought by Salesforce. > My pet theory (that I don't sincerely believe)... To be clear, this combination is a tetradic palete on a color wheel. Color theory and simplified logo trends make this coincidence much more likely than it would initially appear. Still funny. Well now I can't unsee that. Seriously, wishing I could unread his comment. Oh god. I drew a fish and wrote PENIS on the side. Did I beat the game? Well apparently it wasn't trained against asses, since it let me write "Ass" on my fish :P I just saw the N-word written on a fish. so eh.. that didn't last long. 35% for this masterpiece? Rigged My guess is the CNN was trained on highly abstracted stereotypical-fish-drawings, not on actual pictures or high-quality drawings of fish. I put in my best effort to draw a good-looking fish (although I'm no artist) and I got 35%. Then I drew a basic single-stroke fish and got 65%. Magikarp is not a fish to a robot It's not a good fish to pokemon trainers either. 35% seems about right. Try SolidGoldMagikarp this piece de resistance swan song is only 35% fish but then my fish tank is like 90% various formats of blackface fish, nazi fish, and swimming penises Somewhat interesting thing with my 9yo. She's a pretty good artist, she can draw various characters and objects pretty well. With this she clearly just wanted to do the standard stick fish shape, but it turns out she only knows how to do it facing left. Facing left, looks typical, facing right, almost a figure 8. So after like 6 attempts being judged by the computer she's getting frustrated, and I'm like how about this, turn the phone upside down to have her draw facing left. But now she can't do it left either! Feature request: Make the model evaluate the fish and then evaluate the mirrored version of the fish. Pick the highest value as the orientation. What could go wrong? Perhaps ask the user before mirroring? We definitely need a text-to-stickfish model here You're right, that IS interesting. Something about having to learn with rigid constraints first before you can generalize the knowledge, I guess. I think she learned to do the fish the way kids learn to draw a star. It's a motion they learn to do, and she wanted to do that simple motion. She's good at knowing a shape she wants to make and drawing it but I think knowing a gesture she wants to make is different. And then I think when she consciously thinks about it - trying to do it the opposite way, or later the normal way after being judged repeatedly - she can't make the motion that way. But I bet if she was just thinking of the shape and trying to draw that shape it would be zero issue. Suggestion: canvas.addEventListener('dragstart', (e) => { e.preventDefault(); } ); At least on Firefox/Mac, sometimes while dragging it "picks up" the image to drag it. This should prevent that. > exercise in vibe-coding The code shows it... Your escaping routine seems OK, but you really __should not__ be building HTML and JS(!) using raw string interpolation. Or letting the client decide whether the submission needs moderation. I don't let the client decide whether the submission needs moderation :) There's a very slightly different model in the backend that sends things to the mod queue. Strings are also sanitized there. But copilot really wanted to add all that logic to the frontend too and I thought it was funny You still should not be building HTML and JS using string interpolation. Absolutely! I've removed all references of HTML and JS using string interpolation. (jk) This is definitely a drawback with with vibe-coding. I never really write like HTML5 style code - at work I always use typescript with heavy ESLint, so never have to worry about this. I figured the string sanitization in the backend would take care of any XSS vulns, which was my main concern. But I will have to read into the dangers of string interpolation which I admit I do not remember too much about (outside of the XSS stuff I tried to mitigate). Thanks for giving the opportunity to learn... :) > Absolutely! I've removed all references of HTML and JS using string interpolation. I love that this is becoming a meme, haha. Thanks for the laugh. To be fair, everything on the client is raw string interpolation. It's only secure if you comprehensively vet everything once it's on the server. That's absolutely not true. Sanitization on the client is significantly safer, because the client knows how it parses HTML, while the server can, at best, guess (and hope it follows the spec). When you set element.textContent = someUserGeneratedContent, the browser guarantees that the user-generated content will never be parsed as HTML. response.write("<div>" + sanitize(someUserGeneratedContent) + "</div>") has no such guarantee. That's not sanitisation, that's separating data from executable code. It's a better solution when possible, but the solution suggested above also works If that’s all you want, it’s trivial to replace all < and & with their encodings. I did this on a trip to Japan but can't remember for the life of me where. Some museum. My wife and I drew fishes and then they were uploaded and we went to a room and watched them swim across walls/ceilings. Really cool experience One of the teamLab exhibitions, probably: https://www.teamlab.art/e/ 2013 https://futurepark.teamlab.art/en/places/ryubo/ They have it in several other places. Our family did this recently as well at teamLab Planets in Tokyo. I filled out a circular template with a very creepy looking "smiley" face. The template turned out to be for raindrops. I couldn't stop giggling when hundreds of my monstrous creations filled the room, it was very fun. The Singapore ArtScience museum has this concept. Templated sea animal colour in pages that a guide vetted before scanning and then your fish appears on the walls of the dark room in a sea life picture swimming with all the other fish. It was pretty cool. A variation in the other room was the same deal but with flying machines, but this time they gave you a remote control that controlled specifically your creation as it flew around on the landscape projected onto the walls. I found https://dibulo.com - where you (ok and kids) can do it at home :) Teamlabs - Borderless, I also did the same : ) yep that was it! I couldn’t get it to go above 50% and then I wrote “fish” on it and it went up 5 points I gave my blue fish a black Hitler mustache and it went up by ten points https://i.imgur.com/SADe8kn.png 6.3%?????? I have 100 of these in the training data under not_fish.... This guy reddits Moray fans in outrage. > I built a basic CNN trained against penises and swastikas From the description I would say its a 100% dfish First thing I drew. > I built a basic CNN trained against penises and swastikas Isn't this how some Lego MMO died? They spent too many resources on "moderation" and too few on the actual game. If you post that more proeminently, maybe you'll get a bunch of kids on summer holidays finding ways to make penises pass your filter... I tried my damnedest to give my fish a ballsack. That's a real good fishiness detector. Did you manage it after commenting? 'ballsy' is ranked quite highly: https://drawafish.com/rank.html This is only possible due to the surfeit of ballsacks in the training data from users like you :) You mean a skein? What a fun game! Especially on a Note 10+, and I have to say, seeing the dongnet keep up with each pen stroke on a 2019 device is really impressive! Possibly still a little generous, though, I think. Writing "FISH" on a rectangle shouldn't hit 50%, but this does explain why SSN-69 didn't have much of a chance :D This is the most wholesome thing I saw on the internet for a long time. Thanks for the effort! That is fun. And it's nice to know that everyone else on HN is about as artistic as I am. I love when there are traffic spikes and I get to discover which corners of the internet have artistic talent or lack thereof :) We visited the St Louis Aquarium a couple years ago and they have a similar set up. It's pretty awesome and great for kids. It's simply called "Fish Draw"
https://www.stlaquariumfoundation.org/education/conservation... As does the Long Beach Aquarium. Had a lot of fun! This is too much fun! If anyone missed it, you can also rank the fish here: https://drawafish.com/rank.html Fun!!! Small changes if make:
- Change the background colour of the drawing canvas to match the water background
- Add fill tool? So folks can color this fish white? Bonus points if you automatically color the inside part of the fish white
- Fix the discontinuity of how the fish swim by stretching the pixels of the fish that you draw I drew a fish but I couldn't find it anywhere when it switched to the tank. Perhaps you could highlight the user's own fish, at least initially? EDIT: Tried again and now I see there is a highlight, but it's pretty hard to see a in a busy tank, the color contrast is not very high There are light yellow rays coming out of your particular fish I noticed that on the second time but it’s still not very easy to see against the light background Same I drew a mola mola, maybe the probably filtered it out (not fish enough) Took me a sec but your fish has a yellow "glow" effect around it Mine was highlighted with golden rays around it (like a cartoon sun) I keep getting this error on both Safari and Firefox: Uncaught (in promise) Error: Fish model not loaded
verifyFishDoodle https://drawafish.com/src/js/app.js:514
<anonymous> https://drawafish.com/src/js/app.js:170
EventListener.handleEvent* https://drawafish.com/src/js/app.js:168 Edit: Never mind, I had to wait till the model loaded. Took some time though. Fun project nevertheless! This is an issue that many are seeing, it has to do with how the model is loaded / how the submission logic works without it. I think I know the fix, but am currently getting slammed at my big boy job and so I can't fix it until I'm free in the evening ... Absolutely no issues, I figured it out anyway. No stress on this, big boy job way more important :) Fun, but really frustrating to spend a ton of time making a detailed fish, get a fish probability of 67.2%, submit it successfully with no note about it needing moderation, and it still never shows up. And I don't mean "I never noticed it show up in the public tank". I mean my profile says "8 fish created", but if I "view my fish" there are only two in the list. If I go to my default fish tank I see all 8, but if I click on one of the missing ones and try to add it to a different tank or vote on it I get "Failed to <do whatever>: Fish not found". They exist but they don't exist. This isn't a tank, it's a window into purgatory. This doesn’t work for me on Firefox Focus on iOS, even with all the ad and tracker blocking disabled. Tapping on the make it swim button does nothing. I’m able to see the tank with the tank button though. Weird. Vanilla firefox on android works. OP has a clear bias against angelfish. Drawing a catfish was pretty rough. Sometimes the little fins would make it be more fish-like, other times, they would make it less so. I did manage to finally get one in there, but it looked more like a plane than a fish. This is brilliant. Checkout my [Anatomically Correct Fish Tank](https://drawafish.com/fishtank-view.html?id=gYCWJ24lhxSvR4lG...) Shocking no one has mentioned Jian Yang's hotdog app :) [1] [1] https://www.youtube.com/watch?v=tWwCK95X6go&ab_channel=Felix Love the simplicity of this. There used to be something like this at the Boston Museum of Science, where you created a fish (don’t remember if you drew it freehand and/or selected from different fish parts) and released it into the tank with other fish and predators. Nice, I got my upside down penis fish past the filter! Although, once it was swimming it did look very much like a fancy guppy. I don't think anyone would recognize it, but I still feel smug about "beating" the machine. It's OK at filtering out penises, next step is to filter out all the flags... It's so interesting. A large number of strange fish are swimming around. As Bret would say, please stop drawing dead fish. dead fish should float to the top of the tank, not fall to the bottom Some of you are wayy too bored at work - some of these are too realistic Does not work for me on desktop Firefox. When I press the "make it swim!" button, there's an error in console: "Uncaught (in promise) Error: Fish model not loaded" I could submit a fish on desktop Firefox, but apparently the fish died shortly thereafter. Voting is broken though. EDIT: Nevermind! Now there's a problem uploading a fish, and the local aquarium is broken, so I can't view the previous one, either. It's a nice idea, but I really wish it worked better with Firefox (being on the web and all). This is fantastic, the leaderboard is really nice! It reminds me of Paper Planes. My initial fish likelihood score was 7% and I couldn't get it past 12% without looking up what a fish looks like. I learned a lot about myself via this app, so thank you. What a fun, whimsical idea. I love this. Also: When you release something like this to the public, I'm amazed at how quickly humans race to the bottom. That bit can be awful to watch. > Frontend is HTML5 hosted on github pages, backend is Node.JS on GCP. So this means it's doing CORS? Why not just have GCP serve everything? Kudos to the person who managed to sneak a tiny fish, in a fish tank, on a table, with a plant in a plant pot, past the detector. I'm glad we've stopped drawing dead fish (beautiful talk by Bret Victor, 12 years ago): https://vimeo.com/64895205 Also inspired by that: https://drawdeadfish.com/ Cool but ...... This is my feeling of vibe coding this kind of stuff so far. It's never really good, it's just kind of acceptable because it was vibe codeded. The way the fish are stretched where they gets sliced into bands is not something I think most humans would generally choose to do. With a few characters of code change you could at least stretch each column so it scales to the next column. I know vibe coding will continue to get better. There's a bunch of people at my work that have a vibe-coding chat where they show off their latest creation. Most of them they'd done in Gemini Canvas. The prompts are usually 1 or 2 paragraphs like "Make a 3d tower defense game with joypad input where you move a character using the joypad and can place towers by pressing the button. ....." And it spits out a working game but it's only interesting because it was vibe coded, not because the game is actually in any-way-shape-or-form interesting, good, pretty. Also, I appreciate that this game had a fish recognizer but I also found it super scary. I tried to make to make a sunfish and it was like "not a fish". I don't want bad AI judging what is and isn't acceptable. This is so cool! I did just about spit out of coffee reading the words vibe coded fish tinder though. But a smart thing to implement. Locally we have the National Museum of Play. One of the exhibits right near the entrance is a virtual aquarium where you can color in a picture of a fish. Then you take it to a scanner and press a button and your fish starts swimming in a huge screen that serves as a virtual aquarium. Show me a tank of the leaderboard fish! This is my favorite thing today! I only saw one penis fish (with the penis nestled inside the face, as a facial feature of sorts). That's pretty good for a drawing app on the internet, well done! I've given up on running public apps that accept user contributions. Would love to hear more info on how you actually vibe coded this as the fishbowl seems incredibly cool I drew a 100% fish but it was classed only 58% a fish. https://drawafish.com/rank.html?userId=1754072603630_i0f8iw6... I carefully drew a lion fish. Turns out only 37% odds of being a fish. (https://en.wikipedia.org/wiki/Lionfish) Fun idea, fun site! This is the same thing I did when going to teamLab Borderless in Japan, very cool. I recently went to an aquarium in Exmouth, Western Australia, which had a giant wall mounted display with a tablet which allowed kids (of all ages!) to draw a fish and "release" it into the tank. I’m so bad at drawing it only had a 46% confidence level that it was a fish I realized that my drawn with a mouse fish looks a lot like the fish quilt block I made. Neither were very good. But I enjoyed making them both :-) Now to share with my grandkids. This is so fun. I wonder if there is a similar page for other animals, I love that the common styles of fish are a function of what tools people were given. For example, if a fill tool was available I bet we would see far far fewer hollow fish. I love how it immediately became a meta game of how large of a phallus you can get on your fish while still maintaining an acceptable fish-like score. edit - my beautiful Esox Pinilis was culled from the UGC ocean by whoever is manually moderating this :D Very fun. My only suggestion would be a small highlight when you submit your fish so you can easily see which fish is yours - at least for a few seconds. Mine was showing a highlight in Firefox on Windows 11. Subtle "sun rays" around my fish. My fish had a highlight. It looked like rays of light emanating from the fish This happened for me, yellow/gold flashy lines around my fish. Maybe you missed it? Very cool! NN seems too focused on precision over recall (not allowing enough false positives) but trying to get stuff past it is also part of the fun. There’s a museum in Tokyo that has this but for physically drawn fish and is then projected on a large wall. Cool to see a digital version This was my first thought. It’s called Sketch Ocean and it’s in a teamLab experience! I love these kind of websites. After finishing my drawing, I spent way more time than I expected looking through other people drawings. I know you tried to hack it the same way as I did. Fun to try to draw a fish that passes the looks like a fish test, while having as many penis-like features as possible. you can upvote your own fish as much as you want I'm hard stuck on fish probability 59% fml Well the first thing I did was submit a good ole CNB (use your imagination) and it put it under review.... so nice job hah! No obscene fishes observed. Well done! :) i love frivolous stuff like this. it's art that reminds me of the internet's early days, well done. Please approve my anglerfish. Thank you. My eel didn't qualify as a fish :( Neither did mine, only 6.5%, they're the best fish though. its got nazi fish (one with a swastika on it) in the tank already, hooray for the internet This is what the internet should be all about. Now, make a man and we will make him adventure in the forest? If vibe coding means more silly fish-drawing apps in the world then I’m 100% for it. Tell me why my fish just died!? Just went through a little loss and now feel sad It only shows the most recent 50 fish. Your fish got bumped by a newer fish. How do I eat the other fish? This is the only type of thing people should actually vibe code. I love it Very nice work. You could improve the tank rendering performance though... "Built with hate"...?
Too bad. Love the rest of the project. In firefox I'm able to vote for the same fish over and over. I can't find the fish l drew swimming there I wasn't able to submit one, either. Asking ChatGPT Agent to try doing this is hilarious Reminds me of Team Lab Borderless in Tokyo, Japan It looks like this has been hijacked by some edgy online communities. Is there some sort of overlap between HN and cesspits like 4chan? Or did this get posted elsewhere? Unfortunately got posted to some heinous websites... and I made the mistake of using a very simple username and password that's been leaked 100 times for my admin account. I was going to "change it later"... Anyway, working on the rollback now. A nice guy from here reached out and reported some small vulns I involuntarily committed. Getting that fishmax is really hard, any tips? is it normal to expose API key and App ID on Github? I don't use firebase but figured I should ask API key and APP ID are not private for firebase :) They are for IDENTITY not AUTH. https://firebase.google.com/docs/projects/api-keys#faq-requi... What would you expect from "vibe coded"? This is who I want to be when I grow up Haha this is good times - solid site Can you add search by fish name? I get neal.fun vibes from this he is an inspiration 100%!!! Missed opportunity to call it Fish or no fish It did not like my fish :( No worky (Android/FF) hi kiwifarms is drawing offensive images please ban them Start drawing live fish sorry, i accidentally broke it by giving 500 in the url-param Cool, just made nemo! I saw my fish die :( 10/10 love it! No mobile support? There is mobile support... but it currently loads a 40mb model which doesn't work so great in a lot of places where you will use a phone. I meant to allow you to submit anyway, but I didn't test enough. Sorry... Didn't work for me either, android/waterfox :( This is ingenious that's so random and fun! I love it! Great project! Great capcha! Cool I waited for my fish. But it never came. Made me sad. It turns out there are two filters; the fishiness as determined by the UI layer must be separate from the content moderation filters on the backend. I've also had a couple fish that the UI thought were acceptable but the backend (rightfully) disappeared into the void. Now I want to see the adult version of this project: same thing with no CNN. Inundate me with penises and swastikas! RS HN crossover didn't expect to see this lol omg best shit that happened in 2025 yet, well done It got a lot of excitement but almost no front page time so we've given it another go via a re-post and the SCP. Yeah, the mods reposted it because I am a lurker not a poster and have all the deficiencies that exist therein...
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input.type = "file";
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input.onchange = e => {
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const canvas = document.getElementById("draw-canvas");
const ctx = canvas.getContext("2d");
createImageBitmap(input.files[0]).then(img => ctx.drawImage(img, 0, 0));
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