Show HN Daily Selection (2025-04-28)
- I486SX_soft_FPU – Software FPU Emulator for NetBSD 10 on 486SX
- I created snapDOM to capture DOM nodes as images with exceptional speed
- Daily Jailbreak – Prompt Engineer's Wordle
- Bhvr, a Bun and Hono and Vite and React Starter
- Remote-Controlled IKEA Deathstar Lamp
- A Common Lisp implementation in development, supports ASDF
- Logchef – Schema-agnostic log viewer for ClickHouse
- I made a one-click AI ad creator for products
- Talanoa – The email client I always dreamed of (People-first, Kanban)
- NeKernel's AHCI driver and WiP filesystem
- Announcing Nest2D.dev: Open-Source Server-Side Nesting for DXF
- Lil digi – play a platformer game as yourself
- A crowd-data collection Project about Indoor Air Quality (CO2)
- Milchick – a Firefox extension to simplify wordy posts
- Mirror AI – LLM agent that takes action, not just chat
- I Made A parody website for the AI addicted (Brain AI)
- I made Cursor's CMD+K for any website
- I built SecretCrush AI – an AI chat companion app - entirely using AI
- ChatGPT-Ruby – A Minimal, Rails-Friendly OpenAI SDK
- ImgDetect – AI Image Detector to Identify Fake and AI-Generated Images
- Plan-linter – pre-flight safety checker for AI agent plans
I486SX_soft_FPU – Software FPU Emulator for NetBSD 10 on 486SX [Developer Tools]
39 points, 12 comments
A software FPU emulator for Intel 486SX CPUs on NetBSD 10, enabling floating-point support on older hardware.
- Brings floating-point support to 486SX machines lacking a hardware FPU
- Compatible with NetBSD 10
- Open-source project encouraging contributions and feedback
- Targets retrocomputing and OS hacking enthusiasts
Discussion Link, Original Link
I created snapDOM to capture DOM nodes as images with exceptional speed [Developer Tools]
80 points, 31 comments
Capture DOM nodes as images with exceptional speed.
- Fast DOM-to-image conversion
- Lightweight and efficient
- No external dependencies
Discussion Link, Original Link
Daily Jailbreak – Prompt Engineer's Wordle [Developer Tools]
57 points, 36 comments
Daily challenge for prompt engineers to trick LLMs into invoking forbidden functions with the shortest possible prompts.
- Provides a system prompt and forbidden method to bypass
- Leaderboard ranks shortest successful attempts
- Encourages creative prompt engineering to break LLM constraints
Discussion Link, Original Link
Bhvr, a Bun and Hono and Vite and React Starter [Developer Tools]
55 points, 53 comments
A Bun, Hono, Vite, and React starter template for streamlined development.
- Combines Bun, Hono, Vite, and React for a modern stack
- Designed for reusability and automation
- Personal project turned into a public template
Discussion Link, Original Link
Remote-Controlled IKEA Deathstar Lamp [Consumer Tech]
259 points, 51 comments
Remote-controlled IKEA Deathstar lamp with smart automation features.
- Repainted IKEA PS 2014 lamp to resemble Star Wars' Deathstar
- Replaced manual mechanism with remote-controlled motor
- Uses ESPHome firmware with Home Assistant integration
- Features a "sundial" mode that adjusts aperture based on sun elevation
- Future goal: Play Imperial March via stepper motor
Discussion Link, Original Link
A Common Lisp implementation in development, supports ASDF [Developer Tools]
69 points, 39 comments
A developing Common Lisp implementation with ASDF support and unique debugging features.
- Supports breakpoints and stepping
- Includes watchpoints (a rare feature)
- Ships with ASDF for loading systems
- Accepts support via Patreon or Liberapay
Discussion Link, Original Link
Logchef – Schema-agnostic log viewer for ClickHouse [Developer Tools]
23 points, 3 comments
Logchef is an open-source log viewer designed for exploring logs stored in ClickHouse with a focus on speed and intuitive workflows.
- Purpose-built for ClickHouse logs, optimizing log exploration workflows
- Schema-agnostic, working with any existing ClickHouse log tables
- Simple search syntax for efficient querying without writing raw SQL
- Complements log collection tools by focusing purely on exploration
- Open-source (AGPLv3) with a live demo available for testing
Discussion Link, Original Link
I made a one-click AI ad creator for products [Marketing]
3 points, 4 comments
AdMuseAI is a one-click AI tool that generates polished ad creatives from product images with optional style references.
- Generates ads from a single product image
- Optional style inspiration via reference images
- No editing skills or account required
- Free for a limited time
- Simple, no-signup workflow
Discussion Link, Original Link
Talanoa – The email client I always dreamed of (People-first, Kanban) [Productivity]
4 points, 1 comments
A people-first email client with Kanban-style organization and conversation-focused workflow.
- Focuses on people and conversations rather than timelines or inbox zero
- Uses Kanban-style organization to track email status and responses
- Built with Electron (TypeScript + VueJS) and runs entirely locally
- No backend or servers, ensuring scalability without infrastructure costs
- Gradually onboarded users for feedback-driven refinement
- Prioritizes user data privacy with no AI or third-party LLM dependencies
- Future plans include embedded custom AI features like email summarization
Discussion Link, Original Link
NeKernel's AHCI driver and WiP filesystem [Developer Tools]
3 points, 0 comments
A custom AHCI driver for SATA drives and a new filesystem (HeFS) in development.
- Generic AHCI driver supporting read/write operations
- Work-in-progress custom filesystem (HeFS)
- Open-source under GPLv3 license
- GitHub repository available for feedback and collaboration
Discussion Link, Original Link
Announcing Nest2D.dev: Open-Source Server-Side Nesting for DXF [Developer Tools]
3 points, 1 comments
Open-source server-side nesting solution for DXF files.
- Provides efficient nesting algorithms
- Supports DXF file format
- Server-side implementation for scalability
Discussion Link, Original Link
Lil digi – play a platformer game as yourself [Entertainment]
24 points, 20 comments
A platformer game where you play as a pixelated version of yourself generated from an uploaded photo.
- Uses Gemini Flash to convert uploaded photos into animated pixel characters
- Features a challenging platforming level with speedrun potential (fastest times around 17-18s)
- Built with Cloudflare Pages, AWS Lambda, and Gemini
- Offers downloadable animated GIFs of the generated character
- Currently limited by Gemini Flash API restrictions
Discussion Link, Original Link
A crowd-data collection Project about Indoor Air Quality (CO2) [Health]
3 points, 0 comments
A crowd-sourced project collecting indoor CO2 levels to create a free, large-scale dataset for air quality analysis.
- Open-source app (MIT licensed) supporting multiple portable CO2 monitors
- No user registration required
- Largest known dataset of its kind with over 10,000 measurements
- Built with C# MAUI for cross-platform compatibility (Android/iOS)
- Backend uses AWS (queue server, serverless functions, PostgreSQL)
- Focus on public spaces (unlike most studies on homes/schools/hospitals)
- Potential expansion to other air quality indicators like PM2.5
Discussion Link, Original Link
Milchick – a Firefox extension to simplify wordy posts [Productivity]
3 points, 3 comments
A Firefox extension that simplifies wordy posts for better readability.
- Simplifies complex or lengthy text
- Enhances readability
- Works as a Firefox browser extension
Discussion Link, Original Link
Mirror AI – LLM agent that takes action, not just chat [Productivity]
5 points, 4 comments
Mirror AI is a cross-platform desktop LLM agent that executes actions like running terminal commands, managing files, and interacting with APIs instead of just chatting.
- Executes tasks like running shell commands, moving files, and hitting APIs
- Integrates with productivity tools (Gmail, Google Calendar, Notion, Slack, etc.)
- Supports dev/ops tasks (querying databases, GitHub, AWS, REST APIs)
- Includes search/GenAI features (web search, PDF summarization, image/video generation)
- Extensible via Modular Command Protocol (MCP) for custom skills
- Runs locally with no SaaS backend, requiring user approval for risky actions
- Free alpha available with plans to open-source core components
Discussion Link, Original Link
I Made A parody website for the AI addicted (Brain AI) [Entertainment]
4 points, 1 comments
A parody website mocking AI addiction with no practical purpose.
- Humorous take on AI obsession
- No functional utility, purely for entertainment
Discussion Link, Original Link
I made Cursor's CMD+K for any website [Productivity]
4 points, 2 comments
A Chrome extension that brings Cursor's CMD+K functionality to any website for AI-powered actions like summarizing and writing.
- Works on any webpage via a keyboard shortcut
- Automatically grabs page context for AI interactions
- Supports summarizing, explaining, and writing into input fields
- Early-stage development with feedback welcome
Discussion Link, Original Link
I built SecretCrush AI – an AI chat companion app - entirely using AI [ChatBots]
3 points, 4 comments
AI chat companion app built entirely using AI, from infrastructure to frontend.
- Entire stack developed with AI assistance (infra, backend, frontend, chat server)
- Focus on improving user experience through iterative AI agent testing
- Plans to enhance system prompts for AI characters based on chat analysis
Discussion Link, Original Link
ChatGPT-Ruby – A Minimal, Rails-Friendly OpenAI SDK [Developer Tools]
3 points, 0 comments
A minimal, Rails-friendly OpenAI SDK for Ruby.
- Minimal design
- Rails-friendly integration
- Supports OpenAI API
Discussion Link, Original Link
ImgDetect – AI Image Detector to Identify Fake and AI-Generated Images [Image]
3 points, 2 comments
AI-powered tool to detect AI-generated or manipulated images.
- Analyzes images using multiple AI models
- Provides probability score and highlights manipulations
- Privacy-focused with no image data stored
- Available on mobile and web
- Lightweight and easy to use without technical knowledge
Discussion Link, Original Link
Plan-linter – pre-flight safety checker for AI agent plans [Developer Tools]
3 points, 0 comments
A static-analysis tool that catches potential failures in AI agent plans before execution.
- Validates schemas and policies (JSONSchema/YAML/OPA)
- Detects data-flow and taint issues for secrets/PII
- Identifies loops via graph cycle detection
- Configurable risk scoring (0-1) and fail thresholds
- Supports plugin rules via entry_points
- Runs in under 50ms for 100-step plans with zero token cost