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Products that do what Which animal shares your body fat percentage? does
I recently came across a youtube video about animals and their average body fat percentages.I thought it would be fun to compare my body fat to different animals and see which one I most resemble. This idea spiraled into a two-hour project, where I turned the data from the video into a JSON file, asked chatgpt to help create a UI, and deployed the whole thing on netlify. Pretty cool how fast we can quickly build random projects like this 10x faster with llms! Now that I’m typing this, I still have no clue why I made this... but here it is. Enjoy!
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With more traffic moving off-web and into LLMs, I got curious about what traces we leave "in the weights". My design partner and I built a site in the past few weeks that checks recognition across frontier and small models. It queries many of them in parallel, clusters the responses, and tells you how strongly they recognize you. Happy to answer any questions here!
Jun 2026 · intheweights.com
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Estimate body fat using three trusted calculation methods
Jul 2026 · freewww.com
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Hello HN, I built Motion, a fitness app where your virtual pet (we call it a Motmot) grows and gets stronger as you become more active. I wanted a fitness app that didn't feel like a fitness app. Most tools are either data-heavy dashboards or generic streak counters. Neither kept me moving. I thought a creature that visibly reflects your health might create a different kind of attachment. The pet is tied to a broader system: weekly challenges against friends, points for any type of movement, and personalized goals that recalibrate based on your actual activity history rather than fixed…
Apr 2026 · motion-app.com
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I got tired of posting on r/fitness and getting unclear feedback, so I built an app that analyzes physique photos with AI. It started as a weekend project after I couldn't get good advice on my lifting progress. Upload a few pics and the AI tells you: Where you rank compared to others (using a gaming-style tier system) Scores for each muscle group with actual numbers Body proportions and balance issues Body fat estimates and body type I also added some fun stuff like matching you to a "warrior type" based on your build (turns out I'm built like a Viking, not the Spartan I was hoping…
2025 · aestheticrank.com
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Hi! I made http://weightgrapher.com/ Essentially, all the websites I've used between FitBit, LoseIT and MyFitnessPal have really poor graphing. When I joined weight loss groups and forums I found most people are afraid of getting on the scale just because of how discouraging daily fluctuations can be. I aimed to fix this problem by bringing exponentially damped averages into the weight graphing, and educating on using your trending weight to see how you're doing instead of the up-and-down of raw numbers. Thoughts? Feedback?
2013
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Wrote a program in FreeBASIC to try and find out how Genetic Algorithms work. It's a quick hack that I wrote to try some theories with because the Wikipedia Article on GAs reads like greek to me. So I built it from the general principles i knew at the time. The "genome" per individual is an array of 9000 integers but I used only monochrome pictures with either black or white; An individual also has a fitness score. There are 1000 individuals in the population and only two are selected to reproduce. So that makes 9 million (yes, MEELION as El Reg would write) data points and the scoring…
2015
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A very simple idea: when you eat more than your maintenance calories, you gain weight; when you eat less than your maintenance calories, you lose weight. By using an algorithm, we can accurately figure out your maintenance calories more accurately than traditional regression based formulas like katch mc ardle. It's way more accurate than calorie burn tracking devices like fitness bands and watches. (garmin/apple watch/whoop etc...) Traditionally, people often use static TDEE calculators which often over or underestimate for some by 100s calories. Chatgpt and TDEE calculators like…
Jun 2026 · macrocodex.app
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Hi HN, I made a metabolic AI coach to help people with their weight loss and metabolic challenges. In testing with about a dozen people, they have been impressed with how well it figures things out and its surprising insights. I'm surprised, too, at how good it gets compared to typical responses people would ask vanilla chatbots and how positively people are responding to it. https://coach.patchworkfood.com/ Happy to hear feedback or ideas!
2025
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I've been enjoying building calculators with ChatGPT to help me model various life decisions. When my friend shared he drinks 1-2 Starbucks Mochas per day, it made me wonder how that impacts his health over the course of the year (or several years). Drinking 2 mocha's per day adds 45.9 lb (20.8kg) body fat that your body either needs to burn or store per year.
Nov 2025 · kcoleman.me
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Hey HN folks, what do you think of http://signup.mealthy.com/. The principle is simple. You choose what you'd like to do (exam preparation, gain muscles, marathon preparation, become a vege and so on) and we calculate a meal plan for you based on scientific studies which prove some nutrients have a real effects to help you achieve this goal. Meal plans are customised to your lifestyle, age, weight and, obviously, to your objectives. Let me know what you think about it and signup if you want to know more.
2013
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your meals, workouts, and habits — tracked by talking
May 2026 · bios.mealfix.club
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I've just launched this little iOS app as an alternative to Apple Fitness, which is cluttered and chaotic when it comes to visualizing basic workout stats and metrics. The idea is to focus on a clean, minimalistic design and only show high-level metrics that are actually useful, e.g. how often did I work out this week/month/year, cardio vs strength vs mobility, surf session count in February, etc. It's free and offline. Also, no signup, no ads, no data sharing, no social feeds, and no notifications. Just open it and get a quick glance at the state of your workout game within 2s.…
Mar 2026 · apps.apple.com
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Hello HN, I’ve always been passionate about animal welfare, and after noticing the challenges faced by both adopters and shelters, I decided to create PetsRescue. It’s a web app that simplifies the animal adoption process, making it easier for people to find and adopt pets in need. The goal was to create a platform that’s user-friendly, secure, and accessible to everyone who wants to make a difference in the lives of animals. I’d love to hear your feedback on it. Cheers,
2024 · petsrescue.com.br
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I’ve been working on a browser-based evolutionary simulation as a personal experiment. Organisms adapt to environmental pressure over time, and there are no explicit goals or scoring, the system is open-ended and runs continuously. I built this mainly to challenge myself and to explore how to surface simulation behavior and statistics in a way that stays readable rather than overwhelming. As a side effect, it’s also something my kids enjoys watching run. Curious what resonates and what doesn’t, and happy to answer questions about the design or tradeoffs.
Jan 2026 · soupof.life
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