Show HN: AI-generated music box version of any song (for baby) https://bit.ly/4g5aX0G

Show HN: AI-generated music box version of any song (for baby) title basically covers it. project #2 from my paternity leave. My partner & I got frustrated with hearing Brahm's Lullaby and Wheels On The Bus repeatedly. I also stand by that babies can enjoy adult music just as easily as they can enjoy "kids music". But most adult music is too dense/complex for babies to understand, so I created this to generate baby-friendly, slowed down versions of songs that we like to play for our baby & sing along with. Uses BS-roformer for stemming out the input audio + spotify Basic Pitch for transposing to midi. Still needs some work, kinda sounds like a drunk little music box version of the original but very fun. https://bit.ly/3Sfk5GE August 18, 2026 at 12:14AM

Show HN: A benchmark for AI agent guardrails that caught my own plugin https://bit.ly/4bTq7U9

Show HN: A benchmark for AI agent guardrails that caught my own plugin https://bit.ly/4x8sueo August 18, 2026 at 12:11AM

Show HN: Classifier and browser extension to detect rule violating HN comments https://bit.ly/4ielCav

Show HN: Classifier and browser extension to detect rule violating HN comments I love HN, but lately I have been sick of reading the same dismissive criticisms over and over again. Along with political arguments that have been litigated to death, people's issues with smooth scrolling on blogs, etc. Many of these comments do not get flagged for whatever reason. So I made a service to automatically classify whether comments violate (a modified form of) the HN guidelines automatically. In addition there's a Chrome extension to collapse these comments (if they violate your score thresholds) so you don't have to read them too. You can also just watch guideline violating comments as they are posted on the home page. Here's more info on how it works: https://bit.ly/4ifpatb https://bit.ly/4zpdGtk August 17, 2026 at 05:04PM

Show HN: Convertix – Fast, 100% in-browser media and QR tools https://bit.ly/4ziCT8R

Show HN: Convertix – Fast, 100% in-browser media and QR tools https://bit.ly/4zkLkR1 August 17, 2026 at 01:32AM

Show HN: A visual ping utility that is pretty https://bit.ly/4g45G9u

Show HN: A visual ping utility that is pretty As a network engineer, I use ICMP every day. The default ping utility is ugly, I used a prettyping instead. But it got some bugs, isn't configurable and need bash. So I made my own. I hope it will help some other IT guy. For reference, prettyping: https://bit.ly/4xDA1Sa https://bit.ly/4zntRXZ August 17, 2026 at 12:50AM

Show HN: PageSieve, a web scraping browser extension https://bit.ly/45rF6B8

Show HN: PageSieve, a web scraping browser extension PageSieve[1] is a browser extension for scraping data from different websites from within your browser. Currently it's Firefox only but I am open to porting it to other browsers if that's something people want. My original motivation for this started with a desire to improve the capabilities of the selectorgadget[2] bookmarklet to support extracting as well as finding selectors. The ideal use case is when some data you need is useful but you don't want to spend the effort of writing a one-off script to extract it especially nowadays when a lot of websites need an entire JavaScript environment to load correctly which complicates scraping. Using this extension means you only need to maintain the selectors for extracting the data and don't need to worry about managing dependencies. As long as the website can be opened in your browser you should be able to scrape data from it using the extension. I have a lot of features planned as well as some rough edges that need smoothing. I use this extension nearly everyday and I hope it can make somebody else's work easier. Take a look and let me know what you think. [1]: https://bit.ly/4g0DlRv [2]: https://bit.ly/4xB0RKA https://bit.ly/4g0DlRv August 16, 2026 at 02:45PM

Show HN: Stratum – Rate books, films, and music to find users with similar taste https://bit.ly/3Ukfxzs

Show HN: Stratum – Rate books, films, and music to find users with similar taste https://bit.ly/4gAb7gx August 15, 2026 at 11:36PM

Show HN: Mic Drop, a real-time multiplayer karaoke game https://bit.ly/4wyyrQH

Show HN: Mic Drop, a real-time multiplayer karaoke game https://bit.ly/4wAkbqG August 16, 2026 at 01:46AM

Show HN: Bribes.fyi – Compare bribes statistics department wise https://bit.ly/4ibiCMa

Show HN: Bribes.fyi – Compare bribes statistics department wise https://bit.ly/3UBxr0E August 15, 2026 at 11:11PM

Show HN: Bloxwap – The Easiest Way to Trade https://bit.ly/4wtGVbK

Show HN: Bloxwap – The Easiest Way to Trade https://bit.ly/4qfJFrA August 15, 2026 at 01:05AM

Show HN: Mocktail – Free, open-source mock API server with a built-in dashboard https://bit.ly/3RQ70DN

Show HN: Mocktail – Free, open-source mock API server with a built-in dashboard Hi HN, I built the first version of Mocktail years ago. I recently came back to the project, and after a pretty substantial rebuild, v4 is now out. Mocktail is a free and open-source, self-hosted mock API server with a built-in dashboard and database, packaged as a single ~25 MB binary. You can run it locally or on your own infrastructure — no account or hosted service required. You can define endpoints and responses, generate realistic data per request, customize headers, status codes and latency, and inspect incoming requests in real time. With v4, I also added MCP support, so coding agents can create and manage mocks directly, along with an optional built-in AI assistant using your own API key. Both are completely optional. It’s been fun coming back to something I built years ago and bringing it up to date. I’d love to hear what you think, especially anything you’d change or add. https://bit.ly/4ws1Iwg August 14, 2026 at 09:20PM

Show HN: Millennium – Steam Homebrew https://bit.ly/4ck2ggu

Show HN: Millennium – Steam Homebrew https://bit.ly/4wZmWmt August 14, 2026 at 02:47AM

Show HN: Auto-train the harness, not the LLM. cross-model, cross-benchmark gains https://bit.ly/4xxpaJA

Show HN: Auto-train the harness, not the LLM. cross-model, cross-benchmark gains https://bit.ly/4xxpbx8 August 14, 2026 at 01:05AM

Show HN: YazSes – offline hold-to-talk voice dictation for Linux/macOS/Windows https://bit.ly/4x54Qj0

Show HN: YazSes – offline hold-to-talk voice dictation for Linux/macOS/Windows https://bit.ly/3UwJjkA August 14, 2026 at 12:16AM

Show HN: Decant – Understand how you spend tokens https://bit.ly/4xD91lF

Show HN: Decant – Understand how you spend tokens Hey HN - there are lots of tools to understand how many tokens you use and how much it costs, but we haven't found any that tell you where those tokens are going! Decant helps you understand what you are spending tokens on (context gathering, planning, code, chat, etc), so you can optimize it. https://bit.ly/4fTRAYh August 12, 2026 at 10:56PM

Show HN: A marketplace where AI agents buy services from AI agents https://bit.ly/4wZ8pqX

Show HN: A marketplace where AI agents buy services from AI agents https://bit.ly/4zgb40O August 13, 2026 at 12:07AM

Show HN: Play Chess. Earn coins. Build an army https://bit.ly/4gsQToV

Show HN: Play Chess. Earn coins. Build an army Hi there. I'm testing this hypothesis with new chess rules. These changes to the rules can be easily brought to offline games as well. https://bit.ly/4zjQxbU August 12, 2026 at 12:39PM

Show HN: KidScreen, a finite YouTube shelf chosen by parents https://bit.ly/3RKd2FZ

Show HN: KidScreen, a finite YouTube shelf chosen by parents https://bit.ly/4gcGEE3 August 12, 2026 at 12:44PM

Show HN: Woxi - Open-source Mathematica / Wolfram Language reimplementation https://bit.ly/45iHz0H

Show HN: Woxi - Open-source Mathematica / Wolfram Language reimplementation Woxi is an interpreter for the Wolfram Language written in Rust. It comes with Woxi Studio, a Mathematica-like GUI built with iced, but you can also use Woxi through a CLI, Jupyter kernel, Python package, npm package, or WASM module. Compared with wolframscript / Mathematica, the main differences are: - Free and open source - Very fast startup - Typically milliseconds rather than seconds for the Wolfram kernel, making Woxi practical for shell scripts, one-liners, and other short-lived processes - Embeddable - It can run in a browser via WASM or be embedded into another application as a scripting language A more detailed comparison with Mathematica is available here: https://bit.ly/45jDf1h . Conformance is ensured with ~26'000 unit tests and ~900 .wls script snapshot tests. The current focus is on fixing remaining edge cases, improving performance, and growing the community. If you use the Wolfram Language, I'd be particularly interested in feedback on compatibility and missing functionality. Contributions and bug reports are also very welcome: https://bit.ly/4m3tg7n https://bit.ly/3StnUrW August 12, 2026 at 11:06AM

Show HN: Kernelspace- interactive course on systems programming for LLM Serving https://bit.ly/4qeOQbB

Show HN: Kernelspace- interactive course on systems programming for LLM Serving Hi HN, *I* built kernelspace - a free and interactive course that takes a backend engineer (like me) with java/python experience to the systems level required to work on LLM serving at scale. (Mostly an attempt for me to understand what everyone's talking about lately and also an attempt at staying up to date to current tech - career wise). It has: 1. 68 Lessons across 9 tracks, with a rust-from-zero ramp. 2. 8 rust labs - BPE tokenizer, KV block manager, radix cache, batching scheduler, a toy executor 3. 9 simulators running in browser (wasm) - roofline model, KV cache pressure, continuous batching dynamics 4. Fleet week - a simulated prod serving fleet All progresss is local - there is no server (it's served from github pages, repo here https://bit.ly/4woWdyr ) Feedback appreciated, and contributions welcome. I want to make this a really good course for me (and everyone else like me). * (OK, I had sol and kimi on it for most part) https://bit.ly/4woWdOX August 12, 2026 at 02:20AM