Show HN Daily Selection (2025-07-08)
- NYC Subway Simulator and Route Designer
- Ossia score – a sequencer for audio-visual artists
- I Got Tired of Calculator Sites, So I Built My Own
- An Apple-like computer with a built-in BASIC interpreter in my game
- Unlearning Comparator, a visual tool to compare machine unlearning
- Life_link, an app to send emergency alerts from anywhere
- Integrated System for Enhancing VIC Output
- A Language Server Implementation for SystemD Unit Files
- I made a CLI tool to batch convert handwritten notes to Markdown
- A simpler geofence reminder UI
- Vibechat – A chatroom for people bored waiting for Claude
- Yoink AI – macOS AI app that writes everywhere (docs, browser, etc.)
- AI Power Internal Tools
- A browser extension that removes the algorithmic X 'For you' evil tab
- Exploring emotional self-awareness via action-based journaling and AI
- Data Alchemy – Automated feature engineering with specialized AI agents
- I built a website to summarize Tech Twitter each day
NYC Subway Simulator and Route Designer [Entertainment]
114 points, 9 comments
NYC Subway Simulator and Route Designer allows users to visualize and customize subway routes with interactive train behavior.
- Simulates train movement, including spawning, stopping, and speed adjustments
- Enables custom route design by connecting track segments
- Provides visual aid for understanding subway service tweaks
Discussion Link, Original Link
Ossia score – a sequencer for audio-visual artists [Audio]
63 points, 9 comments
Ossia score is a sequencer designed for audio-visual artists.
- Tailored for audio-visual projects
- Functions as a sequencer
- Supports creative workflows for artists
Discussion Link, Original Link
I Got Tired of Calculator Sites, So I Built My Own [Finance]
26 points, 23 comments
A user-built calculator site designed to improve UI/UX, especially for math and finance calculations.
- Focuses on better UI/UX compared to outdated calculator sites
- Currently offers simple math and finance calculators
- Plans to add fraction calculators in the future
- Mobile-friendly design for easier input and readability
- Open to user feedback for further improvements
An Apple-like computer with a built-in BASIC interpreter in my game [Entertainment]
3 points, 0 comments
An Apple-like computer with a built-in BASIC interpreter featured in a game.
- Apple-like computer design
- Built-in BASIC interpreter
- Integrated into a game
Discussion Link, Original Link
Unlearning Comparator, a visual tool to compare machine unlearning [Research]
36 points, 2 comments
A visual analytics toolkit for comparing machine unlearning methods in terms of accuracy, efficiency, and privacy.
- Provides a unified workflow for evaluating unlearning methods
- Includes live demo and open-source code on GitHub
- Supports research with an accompanying paper under review at IEEE TVCG
Discussion Link, Original Link
Life_link, an app to send emergency alerts from anywhere [Life Assistant]
4 points, 0 comments
An app to send emergency alerts via a secret URL, bypassing 2FA and login requirements.
- Allows loved ones to reach you without logging in or 2FA
- Uses a secret short URL for access
- Open-source and deployable on static site hosting
- Includes a generator for pre-configured single-file deployment
Integrated System for Enhancing VIC Output [Consumer Tech]
10 points, 2 comments
A C64 cartridge using FPGA to recreate video for HDMI output.
- Enhances VIC output for HDMI
- Uses Tang Nano 20K FPGA
- Monitors C64 bus
- Handles most C64 tricks
- Still has some bugs in demos/games
- Open-source on GitHub
Discussion Link, Original Link
A Language Server Implementation for SystemD Unit Files [Developer Tools]
70 points, 21 comments
A Language Server Protocol implementation for systemd unit files, offering enhanced editing support.
- Provides syntax highlighting for systemd unit files
- Offers diagnostics to identify errors
- Includes autocompletion for faster editing
- Supplies documentation for reference
- Built with Rust for performance and reliability
Discussion Link, Original Link
I made a CLI tool to batch convert handwritten notes to Markdown [Productivity]
4 points, 2 comments
CLI tool for batch converting handwritten notes to Markdown
- Batch processing for multiple files
- Converts handwritten notes to Markdown format
- Command-line interface for easy automation
Discussion Link, Original Link
A simpler geofence reminder UI [Life Assistant]
3 points, 0 comments
A simpler and more fun geofenced reminder app for iOS.
- Simplifies the setup process for geofenced reminders
- Makes using geofenced reminders more enjoyable
- Designed specifically for iOS
Discussion Link, Original Link
Vibechat – A chatroom for people bored waiting for Claude [ChatBots]
7 points, 0 comments
Vibechat is a chatroom designed for users waiting for Claude, offering a space to pass time.
- Chatroom for users waiting for Claude
- Designed to alleviate boredom during wait times
Discussion Link, Original Link
Yoink AI – macOS AI app that writes everywhere (docs, browser, etc.) [Productivity]
3 points, 1 comments
Yoink AI is a macOS app that enables seamless text editing and generation directly within any text field without copy/paste loops.
- Works across various apps like Word, Gmail, Notion, and Slack
- Rewrites or generates content in place with a simple shortcut (Cmd+Shift+Y)
- Designed for speed and minimal friction compared to verbose AI tools
- No need for manual copy/paste, maintaining workflow efficiency
Discussion Link, Original Link
AI Power Internal Tools [Developer Tools]
3 points, 1 comments
Sashi is a developer tool that creates AI-driven workflows from existing codebases, enabling natural-language interfaces for backend functions.
- Reads and syncs with your codebase via GitHub
- Generates UIs (tables, charts, forms) automatically
- Supports TypeScript + Zod functions
- Enables secure, centralized execution
- CLI-installable for Node.js/Next.js projects
- Beta available for testing
A browser extension that removes the algorithmic X 'For you' evil tab [Productivity]
3 points, 2 comments
A browser extension that removes X's algorithmic 'For You' tab and defaults to the 'Following' tab for a cleaner experience.
- Removes the algorithmic 'For You' tab on X (Twitter)
- Defaults to the 'Following' tab for a curated feed
- Available on Chrome and Mozilla Web Stores
- Open-source, allowing community contributions like language additions
Discussion Link, Original Link
Exploring emotional self-awareness via action-based journaling and AI [Health]
3 points, 0 comments
An Android app that uses AI to infer emotions from users' daily actions instead of direct mood logging.
- Uses a BERT-based model trained on Google’s GoEmotions dataset to classify 28 nuanced emotions.
- Visualizes dominant emotions on a color-coded calendar for quick emotional overview.
- Compares emotional trends across days to reveal patterns linked to actions.
- Action-first reflection reduces pressure compared to traditional mood logs.
- Experimental approach to emotional self-awareness via NLP and behavioral analysis.
Data Alchemy – Automated feature engineering with specialized AI agents [Developer Tools]
3 points, 0 comments
Automated feature engineering platform using specialized AI agents.
- Specialized AI agents for feature engineering
- Automated process to streamline data preparation
- Designed to enhance machine learning workflows
Discussion Link, Original Link
I built a website to summarize Tech Twitter each day [Research]
7 points, 2 comments
A nightly automated service that summarizes Tech Twitter content using GPT-4.1 and recent headlines.
- Pulls tweets from a burner account
- Uses GPT-4.1 for summarization
- Includes recent headlines for context
- Fully automated as a nightly job