Show HN: Neko.js, a recreation of the first virtual pet https://ift.tt/kc6mFri

Show HN: Neko.js, a recreation of the first virtual pet Hi HN, Here is a late Christmas present: I rebuilt Neko [1], the classic desktop cat that chases your mouse, as a tiny, dependency-free JavaScript library that runs directly on web pages. Live demo: https://louisabraham.github.io/nekojs/ GitHub: https://ift.tt/gj9CDxQ Drop-in usage is a single script tag: This is a fairly faithful recreation of Neko98: same state machine, same behaviors, same original 32×32 pixel sprites. It follows your cursor, falls asleep when idle, claws walls, and you can click it to cycle behavior modes. What made this project interesting to me is how I built it. I started by feeding the original C++ source (from the Wayback Machine) to Claude and let it "vibe code" a first JS implementation. That worked surprisingly well as a starting point, but getting it truly accurate required a lot of manual fixes: rewriting movement logic, fixing animation timing, handling edge cases the AI missed, etc. My takeaway: coding agents are very useful at resurrecting old codebases, and this is probably the best non-soulless use of AI for coding. It gets you 60–70% of the way there very fast, especially for legacy code that would otherwise rot unread. The last 30% still needs a human who cares about details. The final result is ~38KB uncompressed (~14KB brotli), zero dependencies, and can be dropped into a page with a single

Show HN: Pion SCTP with RACK is 70% faster with 30% less latency https://ift.tt/ygLD6k7

Show HN: Pion SCTP with RACK is 70% faster with 30% less latency SCTP is a low level protocol focused on reliable packet transmission. Unlike hopelessly flinging packets from one device to another, it makes sure that the packets are correct using CRC, removes duplicate packets, and allows for packets to be sent in any order. Going into an established library, I thought that everything was already implemented and that there wasn't anything to do until I went through the existing issues and organized all the tasks and decided on an order. Sean DuBois ( https://ift.tt/DJUHRQ2 ), one of the co-creators and current maintainers of Pion, an open-source pure Go implementation of WebRTC (which uses SCTP), introduced me to a dissertation that was written about improving SCTP from 2021 ( https://ift.tt/7cdySMG... ). To my surprise, the features in it weren't actually implemented yet, and generally went unused even though it depicted pretty big improvements. This came as a bit of a shock to me considering the countless companies and services that actively use Pion with millions of users on a daily basis. This led to two things: 1) implement the feature (done by me) and 2) measure the performance (done by Joe Turki https://ift.tt/l9KCd6X ). If you're interested in reading more, please check out the blog post where we go over what SCTP is used for, how I improved it, and the effort that went into making such a large improvement possible. This also marks a huge milestone for other companies and services that use SCTP as they can refer to the implementation in Pion for their own SCTP libraries including any real-time streaming platforms such as Microsoft Teams, Discord screen share, Twitch guest star, and many more! For my personal background, please take a look at a comment below about what it was like for me to get started with open-source and my career related journeys. Thanks for reading! https://ift.tt/Qb06Y5F December 28, 2025 at 11:35PM

Show HN: Writing USB Device Firmware with Raspberry Pi Pico and TinyUSB https://ift.tt/YRbZ1sI

Show HN: Writing USB Device Firmware with Raspberry Pi Pico and TinyUSB https://www.youtube.com/playlist?list=PL4C3a7zUGIuYu48KsA3krgm7rtLJwse03 December 28, 2025 at 11:41PM

Show HN: I'm 15. I built an offline AI Terminal Agent that fixes errors https://ift.tt/DKjMYSq

Show HN: I'm 15. I built an offline AI Terminal Agent that fixes errors https://ift.tt/Z7j2HSM December 27, 2025 at 10:27PM

Show HN: Jsonic – Python JSON serialization that works https://ift.tt/JVqknsc

Show HN: Jsonic – Python JSON serialization that works https://ift.tt/1fx9OM8 December 27, 2025 at 07:26PM

Show HN: AgentFuse – A local circuit breaker to prevent $500 OpenAI bills https://ift.tt/CMV061E

Show HN: AgentFuse – A local circuit breaker to prevent $500 OpenAI bills Hey HN, I’ve been building agents recently, and I hit a problem: I fell asleep while a script was running, and my agent got stuck in a loop. I woke up to a drained OpenAI credit balance. I looked for a tool to prevent this, but most solutions were heavy enterprise proxies or cloud dashboards. I just wanted a simple "fuse" that runs on my laptop and stops the bleeding before it hits the API. So I built AgentFuse. It is a lightweight, local library that acts as a circuit breaker for LLM calls. Drop-in Shim: It wraps the openai client (and supports LangChain) so you don't have to rewrite your agent logic. Local State: It uses SQLite in WAL mode to track spend across multiple concurrent agents/terminal tabs. Hard Limits: It enforces a daily budget (e.g., stops execution at $5.00). It’s open source and available on PyPI (pip install agent-fuse). I’d love feedback on the implementation, specifically the SQLite concurrency logic! I tried to make it as robust as possible without needing a separate server process. https://ift.tt/xreA3WY December 28, 2025 at 12:46AM

Show HN: Polibench – compare political bias across AI models https://ift.tt/wTIBR38

Show HN: Polibench – compare political bias across AI models Polibench runs the Political Compass questions across AI models so you can compare responses side by side. No signup. Built on top of work by @theo ( https://twitter.com/theo ) and @HolyCoward ( https://twitter.com/HolyCoward ). Question set is based on the Political Compass: https://ift.tt/PLTdn8g Early and rough. Feedback welcome on revealing questions, possible misuse, and ideas for extending it. Happy to answer questions. https://polibench.vercel.app/ December 27, 2025 at 12:23AM

Show HN: Web CLI – Browser-based terminal with multi-tab support https://ift.tt/ExzeKNo

Show HN: Web CLI – Browser-based terminal with multi-tab support Hey HN! Web CLI, an open-source web-based command management tool just got an upgrade with Interactive Terminal support https://ift.tt/PAuV2k6 December 26, 2025 at 09:53PM

Show HN: CLI to share secrets using one-time public keys https://ift.tt/vZFmLJt

Show HN: CLI to share secrets using one-time public keys https://ift.tt/MxSjKdw December 25, 2025 at 11:50PM

Show HN: Buoy – A persistent, status-bar web server for local utilities https://ift.tt/RzsVEyc

Show HN: Buoy – A persistent, status-bar web server for local utilities I’m constantly building small web-based tools for my own use. Usually, my workflow ends with a dilemma: do I keep a terminal tab open forever running `npx http-server -p 8080`, or do I spend time configuring a Caddyfile for a 50-line HTML tool? Nothing felt right. I wanted something that felt like a native, always-on, utility that was easily accessible but invisible. I built Buoy. It’s a minimal server that: Lives in the status bar: I can see that it's running at a glance without hunting through ps aux. Is persistent by default: It starts with macOS and keeps my utilities alive in the background. Zero-config: It points at a XDG‑Standard www folder so I can create a symlink and be done. Small: I wanted to avoid the modern bloat. Buoy is a single, self-contained binary that's under 10MB. It’s a minimal tool that lets me build many small things and move on to the next. https://ift.tt/iKQORMV December 25, 2025 at 09:51PM

Show HN: WebPtoPNG – I built a WebP to PNG tool, everything runs in the browser https://ift.tt/PowjqfD

Show HN: WebPtoPNG – I built a WebP to PNG tool, everything runs in the browser I built WebPtoPNG after getting frustrated with converters that throttle uploads or phone data; everything runs straight in the browser, and never asks for a signup. https://webptopng.cc/ December 25, 2025 at 02:14AM

Show HN: Elfpeek – A tiny interactive ELF binary inspector in C https://ift.tt/6DM4gu5

Show HN: Elfpeek – A tiny interactive ELF binary inspector in C https://ift.tt/c0fRphu December 24, 2025 at 11:08PM

Show HN: An open-source anonymizer tool to replace PII in PostgreSQL databases https://ift.tt/IBl8mhJ

Show HN: An open-source anonymizer tool to replace PII in PostgreSQL databases https://ift.tt/xSW8hHp December 24, 2025 at 09:45PM

Show HN: Openinary – Self-hosted image processing like Cloudinary https://ift.tt/cEFNTDP

Show HN: Openinary – Self-hosted image processing like Cloudinary Hi HN! I built Openinary because Cloudinary and Uploadcare lock your images and charge per request. Openinary lets you self-host a full image pipeline: transform, optimize, and cache images on your infra; S3, Cloudflare R2, or any S3-compatible storage. It’s the only self-hosted Cloudinary-like tool handling both transformations and delivery with a simple URL API (/t/w_800,h_800,f_avif/sample.jpg). Built with Node.js, Docker-ready. GitHub: https://ift.tt/xeMpiK7 Feedback welcome; especially from Cloudinary users wanting the same UX but on their own infra! https://ift.tt/xeMpiK7 December 23, 2025 at 09:31PM

Show HN: A kids book that introduces authorization and permissions concepts https://ift.tt/ZmnUPtj

Show HN: A kids book that introduces authorization and permissions concepts A colleague and I made a kids' picture book that introduces authorization concepts. We work at AuthZed and explain these concepts regularly. We thought it'd be fun to put them together in a format accessible and appealing to kids and grownups alike. It would also be helpful when explaining what we do for work and make a unique gift for our families. The goal was a fun story first and foremost. We aimed to present concepts accessibly but made conscious decisions to simplify, knowing we couldn't be comprehensive in a picture book format. We also wanted visually appealing illustrations, so we built a custom tool to streamline exploring ideas with AI. It does reference-weighted image generation (upload references, weight which ones matter most), git-like branching for asset organization, and feedback loops that improve subsequent generations. It was built with Claude Code. Here's a screenshot: https://ift.tt/glWyLJj... We'd love feedback on where we chose to simplify. Did we get the tradeoffs right or did we oversimplify? And lastly, did you enjoy the story? You can read the book online: https://ift.tt/QXW2hqd https://ift.tt/QXW2hqd December 24, 2025 at 12:06AM

Show HN: It's Like Clay but in Google Sheets https://ift.tt/U2svlLC

Show HN: It's Like Clay but in Google Sheets Hey everyone! After struggling a lot with data enrichment for SMBs, I launched a Google Sheets add-on that gives you direct access to an AI-powered webscraper. Vurge lets you get structured information from any website right inside your Google Sheet, eliminating the need for learning a new tool or adding a new dependency for data enrichment. Let me know what you think! https://ift.tt/52N3ulx December 19, 2025 at 12:44AM

Show HN: Meds — High-performance firewall powered by NFQUEUE and Go https://ift.tt/kOVD6fr

Show HN: Meds — High-performance firewall powered by NFQUEUE and Go Hi HN, I'm the author of Meds ( https://ift.tt/RkFgAZq ). Meds is a user-space firewall for Linux that uses NFQUEUE to inspect and filter traffic. In the latest v0.7.0 release, I’ve added ASN-based filtering using the Spamhaus DROP list (with IP-to-ASN mapping via IPLocate.io). Key highlights: Zero-lock core, ASN Filtering, Optimized Rate Limiting, TLS Inspection, Built-in Prometheus metrics and Swagger API. Any feedback is very welcome! https://ift.tt/RkFgAZq December 22, 2025 at 10:58PM

Show HN: Real-time SF 911 dispatch feed (open source) https://ift.tt/OfJEHdn

Show HN: Real-time SF 911 dispatch feed (open source) I built an open-source alternative to Citizen App's paid 911 feed for San Francisco. It streams live dispatch data from SF's official open data portal, uses an LLM to translate police codes into readable summaries, and auto-redacts sensitive locations (shelters, hospitals, etc.). Built it at a hack night after getting annoyed that Citizen is the only real-time option and they paywall it. Repo: https://ift.tt/9EJslYq Discord: https://ift.tt/xkCTpGi Happy to discuss the technical approach or take feedback. https://ift.tt/U1vFoCq December 22, 2025 at 06:29AM

Show HN: Mactop v2.0.0 https://ift.tt/FspgYRl

Show HN: Mactop v2.0.0 https://ift.tt/v20ujDV December 22, 2025 at 06:14AM

Show HN: Pac-Man with Guns https://ift.tt/0EXi749

Show HN: Pac-Man with Guns Title really says it all on this https://pac-man-with-guns.netlify.app/ December 22, 2025 at 04:47AM