Show HN Daily Selection (2025-05-03)
- I built a synthesizer based on 3D physics
- GPT-2 implemented using graphics shaders
- Blast – Fast, multi-threaded serving engine for web browsing AI agents
- Exhibit and Site on Mechanisms for Students
- Kinematic Hand Skeleton Optimization in Jax
- OSle – A 510 bytes OS in x86 assembly
- Traycer.ai – Turn GitHub Issues into a Step-by-Step Plan
- A motherfucking app (does one thing, under 300 LOC)
- Show HN (YC S25): Well – MCP AI-Based Collection of Invoices
- Polyseed – first(?) pq PAKE implementation
- Maybe – The personal finance app for everyone
- Immediate-mode GUIs in C# – I wrote an eBook on using Dear ImGui in C#
- Open-Launch – First Complete Open-Source Alternative to ProductHunt
- Dcup – 100% Open-Source RAG-as-a-Service for AI-Powered Search
- Mini Hex – Convert 6-digit colors into their closest 3-digit equivalent
- SQSAdmin – A web service / Docker that can manage your localstack SQS
- I made a toast that shows what visitors are doing in real-time
- LemonadeJS v5 – Micro-reactive JavaScript library (5.5KB, JSX, no deps)
I built a synthesizer based on 3D physics [Audio]
254 points, 67 comments
A 3D physics-based synthesizer leveraging GPU for audio processing, developed as a solo project with contractor support.
- Uses GPU for real-time audio processing
- Features a complex 3D physics simulation system
- Includes a detailed developer log for technical insights
- Showcased in professional demos and conference talks
- Sold directly via the creator's website
Discussion Link, Original Link
GPT-2 implemented using graphics shaders [Developer Tools]
152 points, 22 comments
GPT-2 implemented using WebGL and shaders for GPU programming.
- Uses WebGL and shaders for general-purpose GPU programming
- Inspired by early GPU programming techniques like GLSL
- Demonstrates the potential of shaders for AI model implementation
Discussion Link, Original Link
Blast – Fast, multi-threaded serving engine for web browsing AI agents [Developer Tools]
86 points, 32 comments
A high-performance serving engine for browser-augmented LLMs designed for fast, cost-efficient web browsing AI agents.
- Achieves Google search-level latencies for web browsing tasks
- Features automatic parallelism and prefix caching
- Includes budgeting for memory and LLM costs
- Offers an OpenAI-Compatible API
- MIT-licensed and open-source
Discussion Link, Original Link
Exhibit and Site on Mechanisms for Students [Education]
23 points, 5 comments
Interactive exhibit and website showcasing mechanical mechanisms to inspire kids in engineering.
- Features hands-on, tangible learning experiences with machines
- Includes educational content like videos and 3D printing files
- Open-source project for customization and collaboration
- Inspired by historical engineering exhibits
Discussion Link, Original Link
Kinematic Hand Skeleton Optimization in Jax [Developer Tools]
5 points, 0 comments
Differentiable kinematic hand skeleton in JAX for imitation learning, visualized with Rerun in Jupyter.
- Fully differentiable kinematic hand skeleton
- Built using JAX for optimization
- Visualized with Rerun's callback system in Jupyter
- Shows joint angles and their impact on the skeleton
Discussion Link, Original Link
OSle – A 510 bytes OS in x86 assembly [Developer Tools]
130 points, 25 comments
A minimal 510-byte x86 assembly OS with a file system, shell, and process management.
- Fits entirely in a boot sector without chain loading
- Includes a file system, shell, and basic process management
- Supports writing guest applications like a text editor or games
- Comes with an SDK and browser-based demo
- Aims to demystify assembly and OS development
Discussion Link, Original Link
Traycer.ai – Turn GitHub Issues into a Step-by-Step Plan [Developer Tools]
6 points, 0 comments
Traycer.ai converts GitHub issues into structured implementation plans for easier coding workflows.
- Transforms GitHub issues (descriptions, images, discussions) into actionable steps
- Supports importing plans into IDEs via extension or other coding assistants
- Free for open-source projects, with a 2-week trial for private repositories
Discussion Link, Original Link
A motherfucking app (does one thing, under 300 LOC) [Productivity]
19 points, 23 comments
A minimalist, static HTML/JS app focused on simplicity with a single task box and no unnecessary features.
- Inspired by motherfuckingwebsite.com
- 100% static HTML/JS
- Single task box and "do nothing" button
- No login, tracking, or frameworks
- Under 300 lines of code
- Built for fun and simplicity
Discussion Link, Original Link
Show HN (YC S25): Well – MCP AI-Based Collection of Invoices [Finance]
3 points, 5 comments
Well is an AI-powered Chrome extension that automates supplier invoice collection and syncs data directly into accounting tools, ERPs, or dashboards.
- Automatically captures invoices from emails, portals, and attachments
- Extracts structured data (amounts, vendors, dates) with high accuracy
- Integrates seamlessly with accounting SaaS, ERP, and spend management tools
- Eliminates manual uploads and password sharing
- Designed for solopreneurs, startups, and SMEs, with plans to scale for larger businesses
Polyseed – first(?) pq PAKE implementation [Developer Tools]
4 points, 0 comments
Polyseed is a post-quantum PAKE (Password-Authenticated Key Exchange) implementation.
- First known implementation of post-quantum PAKE
- Focuses on secure key exchange resistant to quantum attacks
Discussion Link, Original Link
Maybe – The personal finance app for everyone [Finance]
21 points, 4 comments
A personal finance app designed for everyone.
- Simple and accessible for all users
- Focuses on personal finance management
Discussion Link, Original Link
Immediate-mode GUIs in C# – I wrote an eBook on using Dear ImGui in C# [Developer Tools]
4 points, 0 comments
An eBook teaching how to use Dear ImGui in C# for building lightweight, cross-platform applications.
- Focuses on immediate-mode GUIs for fast and flexible development
- Provides C#-specific documentation and guides
- Includes code snippets and visual examples
- Free chapters available on GitHub
- Aims to help developers quickly get started with Dear ImGui in C#
Discussion Link, Original Link
Open-Launch – First Complete Open-Source Alternative to ProductHunt [Business]
8 points, 6 comments
Open-Launch is a modern open-source alternative to Product Hunt with a full feature set.
- Open-source under MIT license
- Built with Next.js 15, React 19, and TypeScript
- Includes voting and commenting system
- Offers premium launch options
- Supports real-time notifications
- Features anti-spam protection
- Includes an admin dashboard
Discussion Link, Original Link
Dcup – 100% Open-Source RAG-as-a-Service for AI-Powered Search [Developer Tools]
4 points, 0 comments
Open-source RAG-as-a-Service for AI-powered search from documents.
- Self-hostable and extensible AI search engine
- Supports AWS S3, Google Drive, Dropbox, and direct uploads
- Chunks, embeds, and indexes files in Qdrant
- Hybrid semantic+keyword search with optional re-ranking
- Fast OpenAI responses
- Fully open-source with no vendor lock-in
Discussion Link, Original Link
Mini Hex – Convert 6-digit colors into their closest 3-digit equivalent [Design]
3 points, 4 comments
Convert 6-digit colors to their closest 3-digit shorthand.
- Supports RGB or 6-digit hex values
- Includes a color picker for quick selection
- Simple and lightweight tool
- Open to feedback and improvements
Discussion Link, Original Link
SQSAdmin – A web service / Docker that can manage your localstack SQS [Developer Tools]
3 points, 1 comments
A web service/Docker tool for managing localstack SQS.
- Web-based interface for SQS management
- Docker-compatible for easy deployment
- Designed for use with localstack SQS
Discussion Link, Original Link
I made a toast that shows what visitors are doing in real-time [Marketing]
3 points, 1 comments
ProofyBubble is a real-time social proof tool that displays visitor activity to boost engagement and conversions.
- Shows real-time website traffic, signups, and sales
- Simple and affordable alternative to complex tools
- Helps increase revenue and subscriber growth
- Designed for easy integration with products like Next.js
Discussion Link, Original Link
LemonadeJS v5 – Micro-reactive JavaScript library (5.5KB, JSX, no deps) [Developer Tools]
5 points, 1 comments
LemonadeJS v5 is a lightweight (5.5KB) reactive JavaScript library with JSX support and no dependencies.
- Private reactive state for components
- Scoped events for modularity
- JSX support via Babel plugin
- Children argument for nested components
- Template literal interpolation
- Improved DOM rendering performance
- Works with plain JS, TypeScript, or JSX without a build step