Show HN: Bottlefire – Build single-executable microVMs from Docker images

Show HN: Shellcast.tv – Stream your vibe coding

Still a work in progress, but it&#x27;s usable.This lets you create &quot;tag points&quot;, which are variables with metadata,
view and set their state from the web, and create basic automations via the web.The automations are based on state machines, where each state has a list of &quot;bindings&quot;, that set one variable to an expression as long as you&#x27;re in that state.Every state also has a variable, so you can enter it by setting it to 1.There&#x27;s a (currently unsecured, meant for private WiFi only) WebSockets API, and a Python client.WiFi Power Saving is supported, power consumption is ~7mA when connected to WiFi, but you have to compile under PlatformIO with the right sdkconfig(There&#x27;s an example code file).There&#x27;s a tiny command shell, which lets you dump the files and then push them to a new device. It is just some regexes, but it pretends to support here docs(They have to start with cat &lt;&lt; &quot;---EOF---&quot; &gt; FILENAME
) so that the dumps can be syntax highlighted.There whole thing is modular, you don&#x27;t need to use the web based automation features.One of the modules is MP3&#x2F;WAV playback, with a background track and an FX track.Still some bugs, missing features, and especially missing docs, but I thought I&#x27;d post it now under the &quot;release early&quot; rule!

Show HN: ArduinoCogs adds web-based dashboards and config to ESP32 projects

We&#x27;re two college students building an XR(AR&#x2F;VR) native Operating System with a custom kernel. We&#x27;re also Open Source so feel free to check our GitHub Repository- <a href="https:&#x2F;&#x2F;github.com&#x2F;manaskamal&#x2F;XenevaOS" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;manaskamal&#x2F;XenevaOS</a> .The journey hasn&#x27;t exactly been easy, we&#x27;ve been criticized by a lot saying that whatever we&#x27;re doing is impractical and that we&#x27;re too ambitious. Regardless, we&#x27;ve been committed to reach our goal.Here to answer all questions and doubts. 
Answering one question beforehand because we know someone is going to ask it -Q: Why use your own kernel&#x2F; Why don&#x27;t you use Linux&#x2F; Why are you trying to reinvent the wheel?A: Using our own kernel helps us get rid of the baggage of legacy codes, bring the most optimal performance on our target hardware (XR&#x2F;AR&#x2F;VR) and achieve more efficiency than what we would&#x27;ve achieved on an existing kernel.We&#x27;re not trying to reinvent the wheel, but just building Formula One racing tyres for it.

Show HN: An Open Source XR(AR/VR) Operating System

Hi HN!I’ve always been a fan of application launchers, and I was impressed by the approach the Raycast team took — especially their extension system. About six months ago I started building something similar for Linux, aiming to integrate deeply at the OS level and give extensions a lot of power.Vicinae is written in C++ with Qt Widgets. I chose Widgets over QML for more imperative control of the UI, especially around extension handling. So far that’s worked well — modern C++ is great.To support my goals I built a number of custom widgets, including a fully virtualized list that can efficiently render tens of thousands of items. That gave me a lot of respect for Qt — it’s a powerful framework that mostly stayed out of my way.A key feature is support for Raycast extensions (React + TypeScript), most of which can be installed and used directly inside the launcher (though not all features are implemented yet). There’s also a native API package (@vicinae&#x2F;api) for writing Vicinae-specific extensions with additional capabilities. This required writing a custom React reconciler — surprisingly straightforward, though still unpolished.Like Raycast, Vicinae ships with powerful built-in modules, but the goal isn’t to make a clone. I want it to grow into its own project that fits the FOSS model better, while staying compatible with the Raycast ecosystem. I also plan to bring it to other OSes eventually.I’d love feedback on the technical approach, and suggestions for what would make this useful to you. Contributions are very welcome — I’ve already been pleasantly surprised by how quickly people started helping.Docs: <a href="https:&#x2F;&#x2F;docs.vicinae.com" rel="nofollow">https:&#x2F;&#x2F;docs.vicinae.com</a>
Repo: <a href="https:&#x2F;&#x2F;github.com&#x2F;vicinaehq&#x2F;vicinae" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;vicinaehq&#x2F;vicinae</a>

Show HN: Vicinae – a native, Raycast-compatible launcher for Linux

Hi HN, I’m Eoin, founder of Sourcetable (<a href="https:&#x2F;&#x2F;sourcetable.com" rel="nofollow">https:&#x2F;&#x2F;sourcetable.com</a>).Today, we’re launching Superagents. You can now connect your spreadsheet to any database, API or MCP server on the Internet. All of that data is available inside your spreadsheet, and you can use AI to analyze it and build models, reports and visualizations.The reason I started the company is because I spent 10 years at startups across engineering and operations roles and realized that Excel and Sheets weren&#x27;t architected for the modern information environment. This creates a tremendous amount of nuisance and busywork cobbling together SaaS tools, reporting suites, and the misery of endless coordination meetings to make it all happen. (Boo meetings!)Spreadsheets aren’t just a business application: they’re the original thinking tool. The quality of these tools has a downstream impact on analytical thinking and creativity writ large, so this is a problem worth solving. Fast forward to today, we’re a 6 person team taking on Excel, Sheets and ChatGPT, so we’re excited to hear what you think!Who are Superagents for?
Analysts, operators, and anyone doing data-centric work in spreadsheets. We see a tonne of finance people, of course, but also students, researchers and mom &amp; pop shops. Sourcetable&#x27;s superagents democratize data access and analysis, which is nice because our company’s mission is to make data accessible to everyone.Why “Superagents”? 
Because they can plan and orchestrate other task-specific agents to complete your work for you. We have a lot of different AI tools and agents inside Sourcetable, but there’s a whole lot more on the Agentic Web. Superagents are like the conductor that coordinates them all and calls on them when needed. Also, it’s a fun feature name (thanks, Alyssa!)If you remember the linked-data dream of the semantic web movement, that future is now: all of your business data is available and connected in Sourcetable.How does it work?
Sourcetable is running a python virtual machine under the hood. Everything is sandboxed, and there are hundreds of AI tools and libraries our AI can access. Superagents are also doing code-gen on the fly to solve problems. The closest system we have found is Replit’s sandboxed operating systems. Beyond that Mixtral, ChatGPT and Anthropic offer some limited data connectivity features, except these AI chat services lack the storage, compute, and code execution that Sourcetable and Replit provide. This is all very new.How is this different to your previous data connectors, etc? 
We started out using ETL services to sync data and provide a GUI-driven PowerBI like experience in your spreadsheet. This was useful for people who knew SQL and how to write joins to combine fragmented data, but for everyone else (read: practically everyone), this solution just didn’t provide the frictionless, self-serve experience that we wanted.Our choices were to switch the GTM motion or change the product, so we shelved that reporting suite and focused on our AI spreadsheet and waited for models to catch up with our ambitions. Now that they have, we’re re-launching Sourcetable with our original goal in mind: building a spreadsheet-based operating system for the Agent Web, with fully networked data access for everyone on your team.AI is the great UX enabler.Caveats:* We heavily use Postgres, Google Analytics, Stripe and Google Search Console with Superagents.* We haven’t tested every endpoint on the Internet. We find that mainstream, well documented applications work best.* Yes, you can write data back to 3rd party applications and databases. We generally advise against this unless you understand the risks involved in giving AI write-access to your data.Bonus round:* All data connectors added during this launch week are FREE. (Regular AI messaging limits still apply.)Product Feedback?
eoin@sourcetable.com

Show HN: Superagents – connect spreadsheets to any database, API or MCP server

I&#x27;ve just made public a library to perform real time visual saliency detection on videos (but static images are also supported).This started a couple months ago when, while working on another project, I ended up side-tracking and overkilling as usual. I&#x27;m pretty happy with the result and I think it could prove to be a useful piece of software.It should work on both Linux and macOS, but I&#x27;m yet to test Linux cause I only have a mac at hand. Windows may be doable through WSL.GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;big-nacho&#x2F;dosage" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;big-nacho&#x2F;dosage</a>
Showcase: <a href="https:&#x2F;&#x2F;big-nacho.github.io&#x2F;dosage-docs&#x2F;showcase.html" rel="nofollow">https:&#x2F;&#x2F;big-nacho.github.io&#x2F;dosage-docs&#x2F;showcase.html</a>

Show HN: Real time visual saliency detection

Hi HN,Here&#x27;s a tool I wrote for retrying fallible commands. Nothing groundbreaking here, this is a tool that&#x27;s been made many times (and several have been submitted to Show HN). Though this one does have a more comprehensive feature set than most. I hope one or two people will find it useful.I wrote `attempt` for two reasons:- To have a more featureful alternative to `wait-for-it.sh` for use in Docker Compose. Specifically to apply migration scripts to a database that may not be up yet. I wanted to be able to inspect the error messages from my migration tool &amp; retry on connection errors.- To test a hypothesis I had that a good way to make a CLI was to copy the API of a good library (in this case, `tenacity`). I want to write a blog post at some point to discuss this at length, but the tl;dr is that I believe it was a success.Here are some usage examples: <a href="https:&#x2F;&#x2F;maxbondabe.github.io&#x2F;attempt&#x2F;usage.html" rel="nofollow">https:&#x2F;&#x2F;maxbondabe.github.io&#x2F;attempt&#x2F;usage.html</a>There may not be much to discuss for such a small tool, but I am open to all feedback and am happy to answer any questions.Cheers,Max

Show HN: Attempt – A CLI for retrying fallible commands

Paper is a new design tool. We launched into open alpha today. Anyone can now sign up and use Paper.We started Paper about 1 year ago with the goal to bring more creativity back into design tools. It feels like the existing options are becoming increasingly corporate.To celebrate to launch, we published a new shader that lets anyone see their logo in Apple&#x27;s new heat map animation style. There is no sign-up needed at heat.paper.design.We&#x27;re always looking for feedback from anyone who uses Sketch, Figma, Photoshop, or Illustrator, about what they most need in their professional design tools.Have fun with the new shader and please send me anything you make!

Show HN: Paper's Heat Map Shader

Document is here: <a href="https:&#x2F;&#x2F;atsphinx.github.io&#x2F;qrcode&#x2F;" rel="nofollow">https:&#x2F;&#x2F;atsphinx.github.io&#x2F;qrcode&#x2F;</a>

Show HN: Atsphinx-qrcode – Sphinx extension to generate QR code in document

Show HN: ZeroFS, the Filesystem That Makes S3 Your Primary Storage

Show HN: DevOps Alchemy – Little Alchemy with DevOps Elements

Show HN: Run any GUI app in the terminal with term.everything

I built BPM Finder, a comprehensive audio analysis toolkit that provides three professional-grade tools: BPM detection, musical key identification, and tempo adjustment  all running entirely in your browser.## What makes it different:*Privacy-first approach*: Your audio files never leave your device. All processing happens client-side using Web Audio API, rubberband-wasm, and advanced algorithms.*Three powerful tools in one*:
- *BPM Finder*: Dual-algorithm analysis with 99.5% accuracy and confidence scoring
- *Key Finder*: Chroma analysis with correlation matrices for precise key detection 
- *Tempo Change*: Adjust audio speed without pitch changes using professional rubberband algorithm*Multiple analysis modes*:
- Single file analysis with detailed results
- Batch processing (up to 50 files simultaneously)
- Real-time tap tempo for live BPM detection## Technical highlights:- Built with Next.js 15, TypeScript, and Web Workers for intensive processing
- Supports MP3, WAV, FLAC, AAC, OGG, M4A (up to 50MB each)
- No registration required, completely free to use
- Export results to CSV or integrate with DAW&#x2F;DJ software## Real-world use cases:Professional DJs use it for beatmatching in live sets, music producers organize sample libraries by BPM, fitness instructors create tempo-matched workout playlists, and video editors sync background music to cuts.The project started when I needed reliable BPM detection for my own music production work but couldn&#x27;t find tools that were both accurate and privacy-respecting. After months of research into audio analysis algorithms and Web Audio API optimization, I built this comprehensive solution.*Try it*: <a href="https:&#x2F;&#x2F;bpm-finder.net&#x2F;" rel="nofollow">https:&#x2F;&#x2F;bpm-finder.net&#x2F;</a>Would love feedback from the HN community, especially from fellow musicians, developers working with audio processing, or anyone who&#x27;s tackled similar browser-based analysis challenges.*Tech stack*: Next.js, TypeScript, Web Audio API, rubberband-wasm, web-audio-beat-detector, Tailwind CSS

Show HN: BPM Finder: Advanced Audio Analysis Toolkit

After struggling to find specific files in my 10,000+ media library, I spent 18 months building RekoSearch. It allows you to search across photos, videos, documents, and audio using natural language queries, such as &quot;dog mountain,&quot; or advanced syntax, like `label:couch AND text: &quot;brand name&quot; NOT face:sad`.Built with Rust (Lambda functions on ARM64 and the entire Backend), Python&#x2F;React (frontend), AWS services (Rekognition, Textract, Transcribe), and Kubernetes.• Live demo: <a href="https:&#x2F;&#x2F;rekosearch.com&#x2F;demo" rel="nofollow">https:&#x2F;&#x2F;rekosearch.com&#x2F;demo</a>• GitHub repo with architecture docs: <a href="https:&#x2F;&#x2F;github.com&#x2F;Obscurely&#x2F;RekoSearch-Public" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;Obscurely&#x2F;RekoSearch-Public</a> (includes in-depth handmade excalidraw diagrams)• Blog post about my journey and challenges: <a href="https:&#x2F;&#x2F;www.adriancrismaruc.com&#x2F;blog&#x2F;building-rekosearch-journey" rel="nofollow">https:&#x2F;&#x2F;www.adriancrismaruc.com&#x2F;blog&#x2F;building-rekosearch-jou...</a>• Try it yourself (beta): <a href="https:&#x2F;&#x2F;rekosearch.com&#x2F;beta" rel="nofollow">https:&#x2F;&#x2F;rekosearch.com&#x2F;beta</a> (50 free credits)I&#x27;m open to feedback on architecture, functionality, or any suggestions you have for improvements. Also, I highly recommend trying to build a SaaS app— the knowledge I gained building this far exceeded what I could have learned from smaller desktop projects.

Show HN: RekoSearch – Semantic Search for Media SaaS (Rust, Python, AWS and K8s)

Created MangaRenshuu to make Japanese manga reading more effective for learners - click speech bubbles to see extracted text, toggle romaji button if you want to romaji under the extracted text.Key features:
- Pre-processed speech bubble text extraction using OCR
- Click bubbles to see Japanese text
- Toggle romaji button to see romaji text under extracted text
- Currently has some chapters of Yotsuba&amp;! and Takagi-sanTechnical process: I used OCR tools to extract and clean text from manga pages offline, then built a web interface that overlays the text on original images.Started as a personal study tool that I use daily. Made it open-source after realizing it might help other learners.Would love feedback from other Japanese learners or suggestions for additional manga.Website: <a href="https:&#x2F;&#x2F;www.mangarenshuu.online&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.mangarenshuu.online&#x2F;</a>
GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;MRamazan&#x2F;MangaRenshuu" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;MRamazan&#x2F;MangaRenshuu</a>

Show HN: Read Japanese Manga More Effectively with MangaRenshuu

Cjam is lightweight freeware that can process large numbers of MP3 files without quality loss.Official site: <a href="https:&#x2F;&#x2F;cjmapp.net" rel="nofollow">https:&#x2F;&#x2F;cjmapp.net</a>Also available on MajorGeeks:<a href="https:&#x2F;&#x2F;www.majorgeeks.com&#x2F;files&#x2F;details&#x2F;cjam.html" rel="nofollow">https:&#x2F;&#x2F;www.majorgeeks.com&#x2F;files&#x2F;details&#x2F;cjam.html</a>There’s also a forum where users can share feedback or scripts:<a href="https:&#x2F;&#x2F;forum.cjmapp.net" rel="nofollow">https:&#x2F;&#x2F;forum.cjmapp.net</a>

Show HN: MP3 File Editor for Lossless Bulk Processing

Show HN: Focalist – A distraction-free task app that helps you focus

Hi HN,I have created a webpage that displays all C++ features since C++20 in a simple, searchable table.It is intended to serve as a quick reference for C++ developers, whether as support for cross-platform development or simply to track the current support status out of curiosity.I created it as a simpler, more structured, and more up-to-date alternative to the cppreference compiler support site.
Please note that the page intentionally does not list LWG and CWG papers.
This might change as I am continually updating the site and trying out new ideas.Questions, feedback and suggestions are appreciated, either here or in the form of GitHub issues.

Show HN: C++ Compiler Support Page

hey guys. the other day i was migrating hosting providers and i just needed something not too heavy and convenient to spin up my backups for awhile and realised there is almost nothing out there. kimchi hasn&#x27;t been updated for years and cockpit is heavy. so here&#x27;s something i came up with in a couple hours because of a sudden urge, nothing fancy just basic creation with cloud init, lifecycle management and image&#x2F;storage, but it&#x27;s modern-ish and it compiles to a 8.4mb binary inclusive of the embedded web UI, CLI and API, and only dep is libvirt.

Show HN: Lightweight tool for managing Linux virtual machines

Show HN: OpenCV over WebRTC (in Go)

Years ago I stumbled across a basic version of this concept and it stuck with me. I knew if I was ever going to take on such a project, it would need to be flawless, but without coding experience it was just another idea that would never happen. By the end of 2024, as AI coding tools exploded everywhere, I finally had a way to make it real.I started from zero knowledge and spent months collaborating with AI agents as a learning experience. Every pixel and every function went through me. The AI translated what I asked for into code, but every decision was human. I didn&#x27;t use existing OS frameworks because the goal was learning how basic coding languages worked while also developing my skills with AI collaboration. Apart from basic libraries like xp.css and paint.js, it&#x27;s all original code.The result is a fully functional Windows XP recreation running in your browser. Complete experience with sounds, animations, and working applications. Even works properly on mobile, which required rebuilding everything to maintain the authentic feel without becoming unusable on touchscreens.This project taught me more about coding and AI collaboration than I ever expected. Would love to hear your thoughts on the execution and any feedback on the technical approach.

Show HN: I recreated Windows XP as my portfolio

I created a canvas-based Markdown table editor, which provides a novel (I think) editing experience. I&#x27;d love for people to try it out, or bookmark it for the next time they want to insert a one-off table into a Markdown-formatted comment. My design goals were 1) frictionless user input and 2) fast startup time.Some good-to-knows:- Can be used on mobile- Table data is saved locally to the browser (nothing is sent to a server)- I only tested this on a MacBook, so let me know if the trackpad calibration feels off

Show HN: Tablemd – canvas-based Markdown table editor

Show HN: Super Simple Inventory Management

Hello everyone!After a few months of working on it in my free time, I just launched my biggest project since I started learning programming in August 2024.It’s called Stressio, and it’s a tool designed for companies, especially managers. Employees can anonymously log their stress levels, and managers get a heatmap showing which months are the most stressful. This helps teams identify patterns and take action where needed.There are still some features I want to add, but they’ll come in future updates.Link: <a href="https:&#x2F;&#x2F;stressio.dev" rel="nofollow">https:&#x2F;&#x2F;stressio.dev</a>

Show HN: Stressio – Control Stress Levels

Hey HN! I&#x27;m Zach from Adam (<a href="https:&#x2F;&#x2F;adam.new&#x2F;">https:&#x2F;&#x2F;adam.new&#x2F;</a>). We’re building an AI co-pilot for mechanical CAD software.As part of our broader research, we built a browser-based Text-to-CAD app (<a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=44182206">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=44182206</a>) and are now open sourcing it. This is a React SPA with a Supabase backend.What it does:* Generates parametric 3D models from natural language descriptions, with support for both text prompts and image references* Outputs OpenSCAD code with automatically extracted parameters that surface as interactive sliders for instant dimension tweaking* Exports as .STL or .SCADUnder the hood:* Separate agents for conversation and code generation; simple parameter tweaks bypass AI entirely using deterministic regex-based updates* Runs fully in-browser by compiling OpenSCAD to WebAssembly and integrating Three.js with React Three Fiber for 3D rendering* Supports BOSL, BOSL2, MCAD libraries and custom font support (Geist) for text in modelsWe’ve seen many developers trying to replicate this kind of functionality, so we’re releasing this to give the community a solid foundation to build on.Future improvements:* Expand geometry support - Move beyond CSG primitives to support curved surfaces, fillets, lofts, and constraint-driven modeling through CadQuery&#x2F;Build123D* Better spatial context - UI for face&#x2F;edge selection and viewport image integration to give LLMs spatial understanding* Enhanced capabilities - RAG on documentation and integration with more OpenSCAD libraries for features like proper threadingYou can clone the repo and run it locally! Contributions are welcome, and we’ll keep merging PRs as they come in.

Show HN: Open-sourcing our text-to-CAD app

This is the first half of my book, “Swimming in Tech Debt”. It is available at a pre-launch sale price of $0.99 (<a href="https:&#x2F;&#x2F;loufranco.com&#x2F;tech-debt-book" rel="nofollow">https:&#x2F;&#x2F;loufranco.com&#x2F;tech-debt-book</a>).I have been working on it since January 2024. It is based on some posts in my blog, but expands on my ideas quite a bit.In September 2024, excerpts appeared in Gergely Orosz’s Pragmatic Engineer newsletter, which helped me get a lot of feedback that expanded the book from my initial idea. This half is about what I expected to do before that —- the rest of the book goes into team and CTO practices.

Show HN: Swimming in Tech Debt

The idea is actually quite simple. As a Japanese learner and a coder, I&#x27;ve always wanted there to be an open-source, 100% free for learning Japanese, similar to Monkeytype in the typing community.Unfortunately, pretty much all language learning apps are closed-sourced and paid these days, and the ones that are free have unfortunately been abandoned.But of course, just creating yet another language learning app was not enough - there has to be a unique selling point. And then I thought to myself: why not make it crazy and do what no other language learning app ever did by adding a gazillion different color themes and fonts, to really hit it home and honor the app&#x27;s original inspiration, Monkeytype?And so I did. Now, I&#x27;m looking to find contributors and testers for the early stages of the app.Why? Because weebs and otakus deserve to have a 100% free, beautiful, quality language learning app too！For anyone interested, you can check it out at --&gt; <a href="https:&#x2F;&#x2F;kanadojo.com" rel="nofollow">https:&#x2F;&#x2F;kanadojo.com</a> and let me know what you think ^ ^