Show HN Daily Selection (2025-04-01)
- GuMCP – Open-source MCP servers, hosted for free
- Neuronpedia, an open source platform for AI interpretability
- TypeScript as a proof assistant for intuitionistic propositional logic
- WhatsApp MCP Server
- Million Dollar Homepage is back, but there's a twist
- AI-powered reading companion that helps you read hard books
- Rust Lib for Native OCR on macOS, Windows, Linux
- MCP Neovim Server – Tiny AI Text Assistant for Neovim
- Less Slow C++: Revisiting Performance Tricks for C/C++/CUDA/Asm/PTX
- AnuDB – An experimental C++ document store using RocksDB
- I built an open-source NotebookLM alternative using Morphik
- I built a privacy-first period tracker but it seems nobody cares
- GhydraMCP – Agentic reverse engineering across multiple binaries
- Cache for S3
- JavaScript PubSub in 163 Bytes
- Auto-Browse – AI That Writes Automation Tests in Just One Line of Code
- Fake Broken Screen
- Made a multiplayer game inspired by R/place (100% vibe-coded)
- I made a website that finds your hobbies based on your email
- Neo146 – anti-censorship HTTP-SMS gateway for Turkish (&all) protesters
GuMCP – Open-source MCP servers, hosted for free [Developer Tools]
50 points, 6 comments
Open-source MCP servers hosted for free with standardized integrations across multiple platforms.
- Standardized mono project for all MCP servers to avoid scattered repos
- Free hosting to enable casual experimentation without cost barriers
- One-click integration for non-technical users
- Daily contributions to expand integrations for various apps
Discussion Link, Original Link
Neuronpedia, an open source platform for AI interpretability [Developer Tools]
3 points, 0 comments
An open-source platform for AI interpretability, offering tools to explore and steer AI models.
- Provides APIs and tools for mechanistic interpretability
- Enables sharing and exploration of AI model internals
- Includes 4TB of interpretability data
- Open-sourced with accompanying blog post
Discussion Link, Original Link
TypeScript as a proof assistant for intuitionistic propositional logic [Developer Tools]
8 points, 0 comments
TypeScript as a proof assistant for intuitionistic propositional logic.
- Uses TypeScript for formal verification
- Focuses on intuitionistic propositional logic
- Enables proof construction and validation
Discussion Link, Original Link
WhatsApp MCP Server [ChatBots]
202 points, 124 comments
An open-source, self-hosted MCP server for WhatsApp that connects to your account via WhatsApp Web API and enables LLM integration with local message storage.
- Uses WhatsApp Web multi-device API (via whatsmeow) without third-party dependencies
- Stores messages locally in SQLite for full privacy control
- Allows searching messages, contacts, and groups
- Enables sending WhatsApp messages via LLM tools
- Provides AI agents with WhatsApp context for task execution
Discussion Link, Original Link
Million Dollar Homepage is back, but there's a twist [E-commerce]
3 points, 0 comments
Million Dollar Homepage returns with a new twist.
- Modern revival of the original Million Dollar Homepage concept
- Features a unique new twist (details not specified)
- Interactive and engaging for users to explore
Discussion Link, Original Link
AI-powered reading companion that helps you read hard books [Education]
15 points, 9 comments
AI-powered reading companion designed to help users understand complex books.
- Assists with comprehension of difficult texts
- Uses AI to simplify and explain content
- Ideal for challenging or dense material
Discussion Link, Original Link
Rust Lib for Native OCR on macOS, Windows, Linux [Developer Tools]
3 points, 0 comments
Rust library for native OCR support across macOS, Windows, and Linux.
- Cross-platform OCR functionality
- Native performance without external dependencies
- Supports macOS, Windows, and Linux
Discussion Link, Original Link
MCP Neovim Server – Tiny AI Text Assistant for Neovim [Developer Tools]
5 points, 1 comments
MCP Neovim Server connects AI models like Claude to Neovim for lightweight text assistance.
- Uses Model Context Protocol (MCP) and Neovim's NodeJS client
- Leverages Vim's native editing capabilities
- Supports coding or general text tasks
- Open for feedback and contributions on GitHub
Discussion Link, Original Link
Less Slow C++: Revisiting Performance Tricks for C/C++/CUDA/Asm/PTX [Developer Tools]
5 points, 0 comments
A repository exploring performance optimizations in C++/CUDA/Asm/PTX, covering SIMD, GPU Tensor Cores, meta-programming, and low-latency networking.
- Examines coroutines, SIMD intrinsics, and AVX-512/SVE vectorization for high-performance work
- Compares CPU vs. GPU Tensor Core throughput and programming complexity
- Benchmarks scalar sine approximations (40x faster than standard) and meta-programming (CTRE vs. RegEx)
- Analyzes io_uring vs. POSIX sockets for low-latency networking
- Includes Rust/Python ports and references to CppCon talks and tech blogs
Discussion Link, Original Link
AnuDB – An experimental C++ document store using RocksDB [Developer Tools]
4 points, 1 comments
An experimental C++ document store using RocksDB, targeting embedded systems and IoT.
- Built on RocksDB for efficient high-throughput workloads
- JSON-based APIs for CRUD operations
- Enforced indexing for document retrieval
- Designed for embedded Linux platforms
- Open-source with GitHub repository available
Discussion Link, Original Link
I built an open-source NotebookLM alternative using Morphik [Research]
16 points, 1 comments
Open-source NotebookLM alternative built with Morphik for analyzing research papers and private documents.
- Extracts insights from research papers and private documents
- Compares models on different benchmarks
- Free and open-source
- Integrated into Morphik UI Component
- Supports private document analysis like journals
Discussion Link, Original Link
I built a privacy-first period tracker but it seems nobody cares [Health]
7 points, 3 comments
A privacy-first, free menstrual cycle tracker that keeps all data on-device with no ads, tracking, or hidden costs.
- Your data stays on your device with no cloud sync or accounts
- No ads, tracking, or third-party data sharing
- Export or delete data anytime without restrictions
- Password lock and discreet mode for privacy
- Completely free with no hidden fees
- Built as a protest against exploitative health apps
GhydraMCP – Agentic reverse engineering across multiple binaries [Developer Tools]
3 points, 0 comments
GhydraMCP extends Ghidra reverse engineering by enabling agentic analysis across multiple binaries in a single session.
- Supports multiple open Ghidra files simultaneously
- REST-like HTTP interfaces for improved interaction
- Planned features include renaming local variables
- Built as an extension of the original GhidraMCP plugin
Discussion Link, Original Link
Cache for S3 [Developer Tools]
7 points, 7 comments
Cache for S3
- Provides caching functionality for S3 storage
- Improves performance by reducing access latency
- Simple integration with existing S3 infrastructure
Discussion Link, Original Link
JavaScript PubSub in 163 Bytes [Developer Tools]
7 points, 3 comments
JavaScript PubSub implementation in just 163 bytes.
- Extremely lightweight
- Simple publish/subscribe functionality
- Minimal code footprint
Discussion Link, Original Link
Auto-Browse – AI That Writes Automation Tests in Just One Line of Code [Developer Tools]
3 points, 4 comments
Auto-Browse is an AI-powered tool that automates test writing by executing BDD tests written in natural language with just one line of code.
- Eliminates manual step definitions by interpreting natural language test steps
- Works with BDD frameworks like Cucumber and Playwright
- Drastically reduces test automation setup time
- Example: Executes tests like "When user enters 'admin' in the username field" directly
- Available via NPM and integrates with TypeScript
Discussion Link, Original Link
Fake Broken Screen [Entertainment]
4 points, 1 comments
A tool to simulate a broken screen for pranks or testing.
- Simulates various types of screen damage
- Easy to use for pranks or demonstrations
- No actual harm to the device
Discussion Link, Original Link
Made a multiplayer game inspired by R/place (100% vibe-coded) [Entertainment]
3 points, 0 comments
Multiplayer game inspired by R/place with collaborative pixel art creation.
- Inspired by R/place
- Multiplayer functionality
- Collaborative pixel art creation
- 100% vibe-coded
Discussion Link, Original Link
I made a website that finds your hobbies based on your email [Life Assistant]
4 points, 5 comments
A website that identifies your hobbies based on your email using OSINT.
- Uses OSINT (Open-Source Intelligence) to analyze online activity
- Determines user interests and hobbies from email
- Highlights the power of OSINT for personal data insights
Discussion Link, Original Link
Neo146 – anti-censorship HTTP-SMS gateway for Turkish (&all) protesters [Consumer Tech]
5 points, 0 comments
Neo146 is an anti-censorship HTTP-SMS gateway designed to help protesters in Turkey (and elsewhere) bypass censorship.
- Enables communication via HTTP-SMS
- Designed to resist censorship
- Supports protesters in Turkey and other regions