The best Hacker News stories from Show from the past day
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Show HN: WhatsApp MCP running free on Cloudflare
I wanted my humble Claude on mobile to access my WhatsApp messages but the only options I could find either required WhatsApp Business or an actual server to run Baileys on.<p>I wanted to run it for free on ClaudeFlare and with my personal WhatsApp account, so I built this.<p>Important feature - it connects to your Google account as well as WhatsApp to grab the names of all your WhatsApp contacts, otherwise you get only phone numbers for many of them and search doesn't work properly.<p>This is a single user install because it's both gray area and very private - so point your agent at the repo and let it set things up.
Show HN: 500 clocks in one 6.3 MB HTML file by Opus 5.5
Lately I've been testing frontier models by having them create self-contained web pages that display clocks--sort of my personal version of Simon Willison’s pelican-on-a-bicycle metric.<p>I have been particularly impressed by the variety, interest, and quality of the clocks created by Claude Opus 5.5. Over the course of several sessions in the Claude chat interface, I had it build a total of 500 clocks.<p>Claude’s summary of the prompting process and page design is here:<p><a href="https://github.com/tkgally/500-clocks/tree/main" rel="nofollow">https://github.com/tkgally/500-clocks/tree/main</a>
Show HN: The Zelda timeline to catch up before the Ocarina of Time remake
I made this ahead of the Ocarina of Time remake which comes out in 17 days. I remember the feeling of playing it as a kid but I hadn’t kept up with the story so I built a timeline to catch up before the Door of Time reopens.<p>Nintendo’s own timeline is the authority here (Hyrule Historia and their chronicle page). The fun part was rethinking how to visualize it. It branches at the end of Ocarina into three eras depending on whether Link wins or loses, so each era is its own thread on the cloth. The threads meet again much later with Breath of the Wild.<p>I had a lot of help from Claude. I’d often thought about building things like this but never found the time between the day job and the rest of life.
Show HN: Sphinx – A hook that quizzes you on your AI's code before shipping
FOSS, Basically it plugs into your existing coding agent workflow and every time you push to prod it'll throw up a questionnaire that checks if you understand how the code you're pushing works.
Show HN: Parin – A 2D game engine between raylib and Godot, written in Dlang
Show HN: Things to Do API
I built an api/mcp for local events: pop-ups, one-off events, concerts, etc. currently covering the SF bay area.<p>I've been building a bunch of consumer apps lately around personalization and recommendation and have had a hard time finding this data in one spot. agents can find useful stuff through tool calls / web search, but slow.<p>you can scrape on demand too, but i wanted a faster data set and couldn't find an existing provider for the mix of event types I was searching for.<p>the methodology for it is to find influential accounts/posters/etc. and do a fan out across things that they co-post with.<p>mcp: `claude mcp add --transport http thingstodo <a href="https://api.thingstodoapi.com/mcp" rel="nofollow">https://api.thingstodoapi.com/mcp</a>`<p>I'm considering adding other cities. If you're building something that needs local event data, would something like this be useful and where would you want coverage?
Show HN: Things to Do API
I built an api/mcp for local events: pop-ups, one-off events, concerts, etc. currently covering the SF bay area.<p>I've been building a bunch of consumer apps lately around personalization and recommendation and have had a hard time finding this data in one spot. agents can find useful stuff through tool calls / web search, but slow.<p>you can scrape on demand too, but i wanted a faster data set and couldn't find an existing provider for the mix of event types I was searching for.<p>the methodology for it is to find influential accounts/posters/etc. and do a fan out across things that they co-post with.<p>mcp: `claude mcp add --transport http thingstodo <a href="https://api.thingstodoapi.com/mcp" rel="nofollow">https://api.thingstodoapi.com/mcp</a>`<p>I'm considering adding other cities. If you're building something that needs local event data, would something like this be useful and where would you want coverage?
Show HN: Fakeipedia – Wikipedia for worlds that don't exist
Hi HN!<p>Fakeipedia is an automatic world-building platform which takes an imagined world and makes a whole wiki that you can endlessly explore by clicking red links.<p>I came up with this idea a few months ago after playing around with worldbuilding in Gemini, but I didn't want to release it until a powerful enough model could do it justice, and I decided that Argon is creative enough to write articles that are worth reading. I was surprised how well it turned out and how engaging some of the writing actually is.<p>If you want to generate an article there is a nominal charge attached ($0.90), which helps cover AI/Stripe costs, and I think I just about break even. You can also steer the generation ala choose-your-own-adventure books when generating a new article. Everything generated is free and public for everyone to see.<p>I hope you like it and I'm very much open to hearing about new world ideas/features that would make this project better.
Show HN: High-quality duck audio synthesizer
Show HN: High-quality duck audio synthesizer
Show HN: Esp32sim – Run ESP32 firmware in the browser
Hi HN,<p>I’ve been working on esp32sim, an open-source ESP32 emulator that runs in the browser.<p>The fun part of the demo is that there is no ESP32 involved — the firmware is executing in the emulator.<p>The goal is to make ESP32 software easier to experiment with, test and simulate without always needing physical hardware connected.<p>Source:
<a href="https://github.com/mikroverk/esp32sim" rel="nofollow">https://github.com/mikroverk/esp32sim</a><p>I made a short video showing it in action:
<a href="https://youtu.be/waoWFilTWEc" rel="nofollow">https://youtu.be/waoWFilTWEc</a><p>I’m particularly interested in feedback from embedded developers: what would an emulator like this need to support before you’d actually use it for development, testing or CI?
Show HN: Esp32sim – Run ESP32 firmware in the browser
Hi HN,<p>I’ve been working on esp32sim, an open-source ESP32 emulator that runs in the browser.<p>The fun part of the demo is that there is no ESP32 involved — the firmware is executing in the emulator.<p>The goal is to make ESP32 software easier to experiment with, test and simulate without always needing physical hardware connected.<p>Source:
<a href="https://github.com/mikroverk/esp32sim" rel="nofollow">https://github.com/mikroverk/esp32sim</a><p>I made a short video showing it in action:
<a href="https://youtu.be/waoWFilTWEc" rel="nofollow">https://youtu.be/waoWFilTWEc</a><p>I’m particularly interested in feedback from embedded developers: what would an emulator like this need to support before you’d actually use it for development, testing or CI?
Show HN: Llmspeed – feel how fast a local LLM runs before you buy the hardware
Show HN: Llmspeed – feel how fast a local LLM runs before you buy the hardware
Show HN: My Terminal Themes Web App
Well, after 15 years of saying "Someday I'll turn this into a web app," I finally did it!<p>I've been maintaining a popular repo of terminal themes at <a href="https://github.com/mbadolato/iTerm2-Color-Schemes" rel="nofollow">https://github.com/mbadolato/iTerm2-Color-Schemes</a>, and it was finally time to build the app with all the features I wanted!<p>So, the next-gen version is live at <a href="https://terminalthemes.com" rel="nofollow">https://terminalthemes.com</a>! It currently has over 800 themes, and provides downloads for close to 40 different formats (iTerm, Ghostty, Windows, and many more)<p>It's free for everyone. An account is not needed to browse and download, but registering for an account (free) allows you to vote, bookmark, submit themes, etc.<p>I focused on a11y features for those who need it, in addition to adding Find My Theme and other tools to make it easy to find something you like!<p>Live terminal and code previews help show a more realistic view of the terminal, as opposed to the ANSI screenshots used at the GitHub repository. Those are still there, for those who like them.<p>I would love for you guys to check it out and provide feedback, feature suggestions, whatever!<p>And a huge thanks to the community of people that have contributed themes, ports to other terminals, and tools to provide conversions between formats over the years.<p>Oh! And if you've ever contributed themes to the GitHub repo, please register for an account, find your theme(s), and hit the Claim Authorship button!
Show HN: rStation – A shared research lab for your AI agents
Show HN: rStation – A shared research lab for your AI agents
Show HN: Ito – Build Terminal UIs in Lua
My friend and I are huge Neovim nerds. We like to rice our terminals and our editors. We just wanted a harness that we can do the same with, rice it till our hearts' desire. So, we started looking out for harnesses. Pi was great, Pi was good. But in the end, it was JavaScript. I don't have anything against JavaScript, but Lua is more fitting, and I can just as easily base it in Rust to make it even faster. So, we started cooking, and we ended up with a design that's minimal at its core and is built using Lua. Every built-in abstraction, the way you define providers, the way you rice it up, everything, literally everything, you can do in Lua.<p>But how? How does it all work? I proposed we just do it the Ratatui way, but my friend was like, nah! We shall make it possible to build TUIs in Lua. (Weirdo!) But it paid off, and we got ourselves a shiny new Lua library, ito!!!<p>He didn't get the gravity of the situation. We had an awesome terminal UI library in Lua! I wanted everyone to know how cool that is, so I got cooking, wrote myself a custom canvas implementation of this library instead of the usual terminal adaptor, exported it as wasm, and made this super cool website where you can experiment building awesome UIs in Lua. For vibe-coders, we got an llms.txt too. Have at it, and see if you can build something really cool with it. The library's at github.com/uji-labs/ito, and the awesome sauce harness is at github.com/uji-labs/uji.<p>I hope you like it!
Show HN: Wonderhop – A daily game: guess what most people say, or what none do
Hello HN!<p>Wonderhop is a small browser game with no account needed to play, everyday there are 4 rounds of 7 quesitons like "Name a food that a lot of people hate"
The goal depends on the mode: Either gives the answer most people would give, the one no one would give, the oldest answer or the most recent one and there's a leaderboard for the day.<p>The most interesting part of the project was understanding answers that are typed freely and in 10 languages, there was some typos, plurals, nickname, or even duplicate way of sayign the same thing.
We needed AI judge that checks it really existes conencted to some API like wikipedia to judge the veracity of each answer really quickly (less than 1s on average)<p>The percentage starts from an estimate but move really fast with the answers of real players. If the list missed a good answer, it gets added as soon as a few different players give it.<p>(There are also a lot of secrets and pop culture references added in the game :) )<p>A large part of the code was written with AI tools, but the artistic direction the concept and every choice design are human-made<p>We'd love to know if the goal is clear from the very first question while playing and were any good answers rejected unfairly<p>We are a couple of developers from Montreal that like guessing games so we built this in about two month.<p>Thanks a lot!
Show HN: Wonderhop – A daily game: guess what most people say, or what none do
Hello HN!<p>Wonderhop is a small browser game with no account needed to play, everyday there are 4 rounds of 7 quesitons like "Name a food that a lot of people hate"
The goal depends on the mode: Either gives the answer most people would give, the one no one would give, the oldest answer or the most recent one and there's a leaderboard for the day.<p>The most interesting part of the project was understanding answers that are typed freely and in 10 languages, there was some typos, plurals, nickname, or even duplicate way of sayign the same thing.
We needed AI judge that checks it really existes conencted to some API like wikipedia to judge the veracity of each answer really quickly (less than 1s on average)<p>The percentage starts from an estimate but move really fast with the answers of real players. If the list missed a good answer, it gets added as soon as a few different players give it.<p>(There are also a lot of secrets and pop culture references added in the game :) )<p>A large part of the code was written with AI tools, but the artistic direction the concept and every choice design are human-made<p>We'd love to know if the goal is clear from the very first question while playing and were any good answers rejected unfairly<p>We are a couple of developers from Montreal that like guessing games so we built this in about two month.<p>Thanks a lot!