Show HN Daily Selection (2025-06-01)
- AI Peer Reviewer – Multiagent System for Scientific Manuscript Analysis
- PunchCard Key Backup
- Fontofweb – Discover Fonts Used on a Website or Websites Using Font(s)
- Purpose Reminders – One simple, positive act emailed monthly to all
- SoloDB – A document database build on top of SQLite with JSONB
- I built an AI agent that turns ROS 2's turtlesim into a digital artist
- A site for YC rejection stories
- Dungeon Crawler on Demand Fork
- I Couldn't Find a Good Open-Source Web Video Editor, So I Built One
- LaminarFlow – AI-native, open-source finance platform for startups
- I spent 2 years building an iOS app no one asked for
- I made a simple software licensing platform for developers
- I made a single place scheduling tool
- Dagu 1.17-beta – Run complex workflows without the Airflow complexity
AI Peer Reviewer – Multiagent System for Scientific Manuscript Analysis [Research]
88 points, 72 comments
AI-powered peer review system for rapid scientific manuscript improvement before submission.
- Uses 24 specialized agents to analyze sections, scientific rigor, and writing quality
- Provides detailed feedback with actionable recommendations
- Generates PDF reports
- Supports custom review criteria and target journals
- Offers cloud version (free during testing) and self-hosted option (MIT licensed)
- Self-hosted version allows full customization and OpenAI API key usage
Discussion Link, Original Link
PunchCard Key Backup [Developer Tools]
97 points, 31 comments
PunchCard Key Backup is a tool for securely backing up encryption keys.
- Uses punch cards for physical key storage
- Provides a secure offline backup solution
- Designed for encryption key management
Discussion Link, Original Link
Fontofweb – Discover Fonts Used on a Website or Websites Using Font(s) [Design]
45 points, 18 comments
Fontofweb is a tool that analyzes and reveals font usage details on any website and allows reverse searching for websites using specific fonts.
- Analyzes font weights, line heights, and sizes on any website
- No Chrome extension required for basic functionality
- Reverse font search to find websites using specific fonts (supports multiple fonts)
- Built to track font trends like common pairings and market share
- Cost-effective architecture with a $5/month VPS and Cloudflare services
- Includes a Chrome extension for enhanced functionality
- Provides a public API for pre-scanned domains
- Features an RSS feed for automated content updates
Discussion Link, Original Link
Purpose Reminders – One simple, positive act emailed monthly to all [Life Assistant]
4 points, 0 comments
A free monthly email service that suggests simple, positive actions for collective goodwill.
- Suggests one small, positive act each month (e.g., leaving a positive review for a local business)
- No pressure—users can choose to act or skip
- Tracks and shares anonymous collective impact
- Built with Next.js, Supabase, and Resend
- Aims to foster collective goodwill through simple actions
Discussion Link, Original Link
SoloDB – A document database build on top of SQLite with JSONB [Developer Tools]
5 points, 0 comments
A document database built on top of SQLite with JSONB support.
- Built on SQLite for reliability and portability
- Supports JSONB for flexible document storage
- Lightweight and easy to integrate
Discussion Link, Original Link
I built an AI agent that turns ROS 2's turtlesim into a digital artist [Design]
26 points, 7 comments
An AI agent that transforms ROS 2's turtlesim into a digital artist by interpreting plain English commands.
- Uses LangChain to create an AI agent for simulated environments
- Interprets commands like "draw a triangle" or "make a red star"
- Leverages an LLM to reason through instructions and control the turtle
- Includes modular tools for motion, pen control, and math
- Explores frameworks like LangGraph and MCP for complex robotics tasks
Discussion Link, Original Link
A site for YC rejection stories [Business]
3 points, 0 comments
A site for sharing YC rejection stories and lessons learned.
- Collects reflections and advice from founders rejected by Y Combinator
- Helps applicants learn from others' experiences for future attempts
- Provides a supportive community for rejected founders to share insights
Discussion Link, Original Link
Dungeon Crawler on Demand Fork [Entertainment]
5 points, 0 comments
A continuation of "Dungeon Crawler on Demand" offering new content and an improved experience.
- Provides new content for fans of the original game
- Offers a cleaner, improved gameplay experience
- Playable online at dungeon.werkstattl.com
Discussion Link, Original Link
I Couldn't Find a Good Open-Source Web Video Editor, So I Built One [Video]
5 points, 0 comments
An open-source React-based web video editor built due to the lack of good alternatives.
- Powered by Remotion
- Supports non-linear video editing
- Includes live preview and local exporting
- MIT licensed
- Designed for browser-based video editing tools
Discussion Link, Original Link
LaminarFlow – AI-native, open-source finance platform for startups [Finance]
5 points, 0 comments
AI-native, open-source finance platform for startups and SMBs.
- Combines financial insights, banking, invoicing, and payment tracking
- Features an AI agent for automating repetitive tasks
- Fully open-source (MIT license)
- Operates as an open startup with public transparency
Discussion Link, Original Link
I spent 2 years building an iOS app no one asked for [Health]
4 points, 3 comments
Heart rate zone training app for runners with no initial user feedback, now free to test usefulness.
- iOS and Apple Watch compatibility
- Custom heart rate zones
- Real-time haptic feedback
- Post-run analytics and graphs
- Originally paid (€4/month), now free for feedback
Discussion Link, Original Link
I made a simple software licensing platform for developers [Developer Tools]
4 points, 0 comments
Keyforge is a simple software licensing platform for developers that automates license generation and management.
- Integrates with Stripe for automatic license creation upon payment
- Provides a self-serve customer portal for license and device management
- Allows customers to download invoices
- Designed to simplify the licensing process for developers
Discussion Link, Original Link
I made a single place scheduling tool [Productivity]
3 points, 0 comments
Single-place scheduling tool.
- Centralized scheduling solution
- Simplifies appointment management
- Designed for ease of use
Discussion Link, Original Link
Dagu 1.17-beta – Run complex workflows without the Airflow complexity [Developer Tools]
3 points, 0 comments
Dagu 1.17-beta is a lightweight workflow engine for running complex workflows without the overhead of Airflow, using YAML definitions and a single Go binary.
- Define workflows in YAML and run them as scheduled jobs or on-demand
- Single Go binary with no external dependencies and local storage
- Supports nested DAGs (workflows calling other workflows)
- Refactored execution history storage (10x faster for large histories)
- Improved debugging UI showing precondition results and variable outputs
- Proper job queue management
- Example use cases: ETL pipelines, report generation, and system maintenance tasks