Show HN: Understanding the Spatial Web Browser Engine https://bit.ly/45zutfb

Show HN: Understanding the Spatial Web Browser Engine After absorbing opinions from the previous post, I wrote an article specifically introducing what a Spatial Web Browser Engine is. https://bit.ly/4mMsQ4Q August 12, 2025 at 01:43PM

Show HN: Nabu (TTS Reader and LLM Playground on Android) https://bit.ly/45BDQuY

Show HN: Nabu (TTS Reader and LLM Playground on Android) You can follow along with the progress at the github, but I've added support for Gemma 3 120M, the speed for local LLM to TTS token time is incredible! https://bit.ly/46RziCS August 15, 2025 at 01:04AM

Show HN: Gitego – Automatic Git identity switcher https://bit.ly/47uo3QZ

Show HN: Gitego – Automatic Git identity switcher # gitego: Automatic Git Identity Switcher I was juggling work and personal GitHub accounts with separate PATs for a long time and constantly forgetting to switch between them. Needed a way to commit to personal and work projects without the mental overhead of managing two Git identities. My issue: ``` cd ~/work/important-project git push # Authentication failed - using personal PAT for work repo ``` Then the dance: ``` git config user.email "work@company.com" # Update Git credential helper or remember which PAT to use # Rinse and repeat every time I switch contexts ``` My solution (I'm sure others exist?) ``` # One-time setup gitego add work --name "John Doe" --email "john@company.com" --pat "ghp_work_token" gitego add personal --name "John" --email "john.personal@gmail.com" --pat "ghp_personal_token" gitego auto ~/work/ work gitego auto ~/personal/ personal # Now it just works cd ~/work/any-project git commit -m "fix bug" && git push # Uses work identity + PAT automatically cd ~/personal/side-project git commit -m "new feature" && git push # Uses personal identity PAT automatically ``` How It Works - Uses Git's native `includeIf` for identity switching - Acts as a Git credential helper for automatic PAT selection - Stores PATs securely in your OS keychain - Single Go binary, works on macOS/Windows/Linux No more context switching overhead. Just cd and commit. GitHub: https://bit.ly/4mLIgX8 Install: go install github.com/bgreenwell/gitego@latest Feedback welcome! Keep in mind, I built this as a personal tool, making it public in case others have the similar problems and can benefit from the solution! https://bit.ly/4mLIgX8 August 13, 2025 at 08:19PM

Show HN: Real-time privacy protection for smart glasses https://bit.ly/4oy05ua

Show HN: Real-time privacy protection for smart glasses I built a live video privacy filter that helps smart glasses app developers handle privacy automatically. How it works: You can replace a raw camera feed with the filtered stream in your app. The filter processes a live video stream, applies privacy protections, and outputs a privacy-compliant stream in real time. You can use this processed stream for AI apps, social apps, or anything else. Features: Currently, the filter blurs all faces except those who have given consent. Consent can be granted verbally by saying something like "I consent to be captured" to the camera. I'll be adding more features, such as detecting and redacting other private information, speech anonymization, and automatic video shut-off in certain locations or situations. Why I built it: While developing an always-on AI assistant/memory for glasses, I realized privacy concerns would be a critical problem, for both bystanders and the wearer. Addressing this involves complex issues like GDPR, CCPA, data deletion requests, and consent management, so I built this privacy layer first for myself and other developers. Reference app: There's a sample app (./examples/rewind/) that uses the filter. The demo video is in the README, please check it out! The app shows the current camera stream and past recordings, both privacy-protected, and will include AI features using the recordings. Tech: Runs offline on a laptop. Built with FFmpeg (stream decode/encode), OpenCV (face recognition/blurring), Faster Whisper (voice transcription), and Phi-3.1 Mini (LLM for transcription analysis). I'd love feedback and ideas for tackling the privacy challenges in wearable camera apps! https://bit.ly/4oy05KG August 11, 2025 at 08:40PM

Show HN: Mock Interviews for Software Engineers https://bit.ly/4lvvDyn

Show HN: Mock Interviews for Software Engineers https://bit.ly/3IIwGNI August 14, 2025 at 12:02AM

Show HN: langdiff – Stream valid JSON from LLMs with type-safe callbacks https://bit.ly/45efYhV

Show HN: langdiff – Stream valid JSON from LLMs with type-safe callbacks Ever had json.loads() explode halfway through an LLM stream? langdiff fixes that with a schema + callback approach. Define your schema → attach callbacks → push streaming tokens → get structured events immediately. https://bit.ly/46ZMuFX August 13, 2025 at 05:22AM

Show HN: A fun side project on chivalry and virtues https://bit.ly/4mFIBue

Show HN: A fun side project on chivalry and virtues Hi Hacker News, I'm excited to share a small side project I've been working on: *http://www.chivalrytest.online*. This is a fun, quick online quiz designed to help people explore a concept that's often seen as archaic but holds timeless values: chivalry. The idea behind this project isn't to be a historical authority. Instead, it's a lighthearted way to reflect on some core virtues that are still relevant today, such as: * *Courage:* How do you react when faced with a difficult choice? * *Honor:* What role do integrity and responsibility play in your decisions? * *Humility:* Are you willing to admit your mistakes and learn from them? The test asks a series of simple questions and provides a result that categorizes you as a specific type of knight, like a "Knight of Honor" or a "Knight of Wisdom." It's a quick and engaging way to spark some self-reflection. I built this project using `html、JQuery、TailwindCSS` and it was a great learning experience. I'd love to get your feedback on the questions, the results, and the overall concept. What do you think? Are these virtues still relevant in today's world? Thanks for checking it out! https://bit.ly/4lo4QUs August 13, 2025 at 02:14AM

Show HN: Build agents directly in your notes and tables https://bit.ly/4llggZ3

Show HN: Build agents directly in your notes and tables I'm building a workspace for doing focus work while also managing constant multi-tasking and context-switching that's required in a lot of roles. Currently this is done by using a notes system where we can split-screen AI chat, an object-based data table system for tracking entities, as well as viewing other documents. We can define agents directly from documents by giving instructions in plain language and then defining the trigger conditions. This helps automate workflows directly in the place where we're reading and writing content. I'm continuing to experiment with instructions and templates to figure out the best ways to automate tasks like content creation and responding to emails or leads. https://bit.ly/45dprpM August 12, 2025 at 11:16PM

Show HN: I built a visual AI workflow builder because debugging prompts is hard https://bit.ly/3HsK9J7

Show HN: I built a visual AI workflow builder because debugging prompts is hard Hey everyone! I built this because I was tired of manually handling customer support for my web app and couldn't get an AI system to handle requests reliably. I tried different AI tools to help with support tickets, but when they handled requests incorrectly, it was impossible to determine why, and even harder to figure out what I needed to change to improve the system. I wanted to break down my logic of how the AI should think through the problem step-by-step, but everything had to be crammed into one prompt. Without the volume of clean training data needed for fine-tuning, I was stuck with prompt engineering guesswork. What Chainix does: You drag and drop steps into a visual flowchart. Each step gets its own inference instructions, and based on the output, it branches to different next steps. The AI can also pause mid-flow to call your functions or check variables, then continue. This lets you visually map out exactly how you want the AI to think through the problem (like a flowchart). I built it with flexibility in mind - you can create something as simple as a two-step workflow or build complex custom logic with multiple branches and conditions. The key: when something goes wrong, you can see exactly which step failed. Instead of one big black box, you have a chain of smaller, debuggable pieces. My support flow might classify the ticket, look up account info, check for known issues, then craft a response. When the AI did something wrong, I could see "oh, this step classified the ticket incorrectly" and just fix that inference step (or add a new one). It's handling ~60% of my support requests reliably now (and correctly ignoring the rest), so I'm very happy with it! The biggest win is that I can actually see how the AI is reasoning through each step, so fixing issues is straightforward instead of guesswork. This works for any workflow involving text interpretation and action - content moderation, document processing, lead qualification, etc. You can try it at https://bit.ly/4mFLIm2 - would love to hear if other people have hit this same wall with AI tools! Also curious what other workflows people might want to build with this approach. https://bit.ly/4mFLIm2 August 12, 2025 at 01:53PM

Show HN: Move to dodge the bullets. How long can you survive? https://bit.ly/45eGojJ

Show HN: Move to dodge the bullets. How long can you survive? https://bit.ly/47p0A3A August 12, 2025 at 09:18AM

Show HN: Enter your domain and my open-source agent will hack it https://bit.ly/4mbceDJ

Show HN: Enter your domain and my open-source agent will hack it I built an open-source AI agent for security testing to find and fix vulnerabilities in your code. I’ve noticed how bad security vulnerabilities have gotten with everyone shipping AI code slop, so I wanted to build something that allows for vibe-coding at full speed without compromising security. Traditional security tools aren’t effective, and manual pen-testing can’t keep up with the rapidly growing AI code This tool runs your code dynamically, finds vulnerabilities, and validates them through actual exploitation. You can either run it against your codebase or enter your (or someone else’s) domain to scan for vulnerabilities. Good luck, have fun, hack responsibly! https://bit.ly/4fzyZif August 12, 2025 at 02:06AM

Show HN: Keeps – Mail a postcard that plays your voice https://bit.ly/4onB2dg

Show HN: Keeps – Mail a postcard that plays your voice Hi everyone — I’m Clark, creator of Keeps, a way to send physical postcards that play your voice with a quick QR code scan. WHAT IT IS Upload a photo (or pick from Unsplash), write a message, optionally add a 60 second voice note, and send a 4×6 postcard. QR code printed on the postcard links to a “digital card” that plays the audio. $5 flat, printing + postage included. No account required. WHY I BUILT IT I love mailing postcards to my family but hate it's a hassle (finding card, buying stamp, handwriting, praying it arrives on time). I wanted to merge the charm of physical mail, the warmth of voice messages, and the efficiency of software. HOW IT WORKS Built with Next.js, Supabase, Stripe, Resend, and Lob. QR codes link to hosted audio. Stripe handles payment. Lob prints and mails the cards. Resend emails status updates. WHAT'S DIFFERENT - Voice note + physical card combo - Minimal editor, no sign-up friction - Transparent $5 price (everything included) TRY IT FREE 1. Go to https://bit.ly/45LpmK3 2. Create your card 3. Use promo code SENDKEEPSFREE for a free send (first 50 people) FEEDBACK WANTED - Editor UX - QR/digital card flow - Address autocomplete UX - Critical missing features - Interesting use cases (wedding thank yous, airbnb hosts, etc) Happy to share details or answer questions! https://bit.ly/4oOuDs3 August 12, 2025 at 12:45AM

Show HN: QuotationGenie – Create and Track Quotes, Invoices, and Contracts https://bit.ly/3J7ggyt

Show HN: QuotationGenie – Create and Track Quotes, Invoices, and Contracts With QuotationGenie you can: Create customized quotations in minutes Generate invoices and track payment status (paid, unpaid, overdue) Draft, send, and sign contracts digitally I built this after getting frustrated with juggling multiple tools for quotes, invoicing, and contracts — now it’s all streamlined in one dashboard. Would love your feedback on usability, features, and what you’d want to see next. Thanks for checking it out! https://bit.ly/4ma5OEU August 11, 2025 at 05:17AM

Show HN: A Sinclair ZX81 retro web assembler+simulator https://bit.ly/4frLn3O

Show HN: A Sinclair ZX81 retro web assembler+simulator Lots of fun to do. I would have not taken the time without the speedup provided by Claude. https://bit.ly/47oCINz August 11, 2025 at 01:44AM

Show HN: A reading to remind us to keep raising our voices against oppression https://bit.ly/3UntBFo

Show HN: A reading to remind us to keep raising our voices against oppression https://bit.ly/3Jc1o1H August 10, 2025 at 01:24PM

Show HN: Engineering.fyi – Search across tech engineering blogs in one place https://bit.ly/4mfttUK

Show HN: Engineering.fyi – Search across tech engineering blogs in one place I built a search engine for engineering blogs because I was tired of manually checking individual company blogs to find real-world production examples. The problem: When learning a new technology, the best insights often come from how companies like Google, Meta, or Stripe actually implement it in production. But these gems are scattered across dozens of separate engineering blogs with no way to search across them. What I built: Engineering.fyi indexes engineering blogs from ~15 companies (Google, Meta, OpenAI, Anthropic, Stripe, Uber, etc.) and makes them searchable in one place. You can filter by topic, difficulty level, and whether articles include code samples. Technical details: - Built with Next.js, SQLite, DrizzleORM - Custom scrapers for each blog (they're all frustratingly different) - Basic tagging system using content matching (still improving this) Current status: Core search is working. Adding new blogs weekly as I index them. Next features (based on early feedback): - AI summaries for quick article previews - Weekly digest of trending engineering insights - Save/bookmark articles (considering whether to add accounts) Interesting challenges: - Each blog requires custom parsing logic (no standard format) - Building an accurate tagging system is harder than expected – started with exact matching but exploring better approaches I'd love feedback on: - Which company engineering blogs you'd find most valuable to include - Whether AI summaries would actually be useful or just noise - How you currently discover engineering articles from these companies https://bit.ly/4mdaPwG August 10, 2025 at 02:44PM

Show HN: Play Brainrot Games Online https://bit.ly/3URjoB5

Show HN: Play Brainrot Games Online Brainrot Game is a free-to-play, browser-based hub that serves up instant, meme-fueled mini-games—think Italian sharks in sneakers, Tralalero Tralala remix levels, and Tung Tung Sahur puzzle chaos—all without downloads, logins, or paywalls. Every Brainrot game runs on lightweight HTML5 technology, so you can jump straight into the action on Chromebooks, phones, or PCs at school, work, or home. Updated weekly with new viral characters and trending sound bites, Brainrot Game keeps the dopamine hits coming and the brainrot growing. Is there any other game you want to play? https://bit.ly/4fFqVN1 August 10, 2025 at 10:51AM

Show HN: AI Coloring Pages Generator https://bit.ly/4oufWdb

Show HN: AI Coloring Pages Generator Hey Ycombinator News community! I'm excited to share AI Coloring Pages Generator with you all! As a parent myself, I noticed how hard it was to find fresh, engaging coloring pages that my kids actually wanted to color. So I built this AI-powered tool that lets anyone create custom coloring pages in seconds - just describe what you want and watch the magic happen! Whether it's "unicorn princess," "summer theme," or "cute kittens," the AI generates beautiful, printable coloring pages that are perfect for kids and adults alike. The best part? It's completely free to use! I've already seen families, teachers, and even therapists using it to create personalized activities. There's something special about seeing a child's face light up when they get to color exactly what they imagined. Would love to hear what you think and what kind of coloring pages you'd create! https://bit.ly/3JpSuOc August 10, 2025 at 08:34AM

Show HN: AI feedback on system design diagrams https://bit.ly/4fr4xGZ

Show HN: AI feedback on system design diagrams Hey everyone, I made a tool to practice System Design for technical interviews. I am currently practicing System Design interviews and honestly this is not my forte. Since I am also trying to keep my programming skills sharp and get more products to show off in my portfolio, I thought maybe I could implement a tool that would help people practice this kind of interview as well. It seems most of people preparing for such interviews are using: * videos of recorded practice interviews * books (especially Designing Data-Intensive Applications) * mock interviews with FAANG engineers ($$) The goal of this tool is to provide a whiteboard to the user, then use AI (Gemini) to assess the user submission with respect to some metadata about the problem that guide the LLM about what a good solution should look like. Not selling anything, there is no paywall, no login, not asking for email etc. For now, I'm just trying to see if someone else finds this useful, and if this idea got legs. If it doesn't I would open-source it (code needs some cleaning). Hope someone finds this useful: https://bit.ly/4lkDC0X Any feedback is appreciated! PS: There are a few bugs that I am working on, noticeably the anchoring of edges can be buggy at times but this is only a display issue. PPS: Right now, it's using Gemini free tier. https://bit.ly/4lkDC0X August 9, 2025 at 08:45AM

Show HN: Keywords for Self-Talk https://bit.ly/4otknoA

Show HN: Keywords for Self-Talk https://bit.ly/46OG2Bn August 9, 2025 at 08:29AM