I built a virtual pet that gets stronger when you exercise
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…
What it does
In the maker’s words, at launch
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 targets. It connects with phones, smartwatches, and other fitness apps so it works however you already track movement. We're also running a beta of Fit Bingo, a bingo card of weekly fitness tasks, which has been more popular than I expected. Would love to hear what you think, especially if this sounds like something you'd actually use.
Does the same job
all alternatives →- FAFitocracy, an RPG for fitness2011 · ▲102
My cofounder and I have been working on a site called Fitocracy (www.fitocracy.com), which is a social game for fitness. The idea was very much inspired by our experiences growing up as nerds playing video games, later on discovering weightlifting, and drawing the parallel between working out and "leveling yourself up." XKCD has a pretty well known comic to this effect: http://xkcd.com/189/. We find that the metaphor of workout out as leveling up in a video game resonates with quite a few people, so Fitocracy is an attempt to bring that to life. On Fitocracy, tracking your workouts earns you…





More life & fun this month
the category →- TL
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Photosynthesis fires two of your iPhone
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Scroll through all 43,252,003,274,489,856,000 reachable Rubik's Cube permutations.
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Hi HN, I built Eigendrum, a web tool that solves the 2D wave equation for arbitrary shapes so you can hear what they sound like as drums. How it works: * Solves -∇²u = λu using finite element analysis (Kφ = λMφ) on a triangle mesh. * Validated to <0.1% error against closed-form solutions for circles (Bessel zeros) and rectangles. * Sound model factors in strike location, Rayleigh damping, and mallet width. * Includes Kac drums I & II to demonstrate identical sound spectra from different geometries. * No frameworks, build steps, or dependencies. Repo and tests:…
Life & fun · 26d ago · baselashraf81.github.io
Launched alongside, April 2026
the whole month →
- AG
Thought the resources for GPU arch were lacking, so here we are
Life & fun · Apr 2026 · jaso1024.com
- IB
Built a ~9M param LLM from scratch to understand how they actually work. Vanilla transformer, 60K synthetic conversations, ~130 lines of PyTorch. Trains in 5 min on a free Colab T4. The fish thinks the meaning of life is food. Fork it and swap the personality for your own character.
AI · Apr 2026 · github.com

- BC
Life & fun · Apr 2026 · sam-burns.com
- IB
With social media and now AI, its important to keep the indie web alive. There are many people who write frequently. Blogosphere tries to highlight them by fetching the recent posts from personal blogs across many categories. There are two versions: Minimal (HN-inspired, fast, static): https://text.blogosphere.app/ Non-minimal: https://blogosphere.app/ If you don't find your blog (or your favorite ones), please add them. I will review and approve it.
AI · Apr 2026 · text.blogosphere.app