Show HN Daily Selection (2025-08-03)
- NaturalCron – Human-Readable Scheduling for .NET (With Fluent Builder)
- WebGPU enables local LLM in the browser – demo site with AI chat
- Wordle-style game for Fermi questions
- Open-sourced my prompt management tool for LLM-powered apps
- F1 COSMOS – Live timing and data dashboard for F1 fans
- Minecrack – A simple, offline Minesweeper game for Android
- Forced to Give Your Password?
- Agentic AI Frameworks on AWS (LangGraph,Strands,CrewAI,Arize,Mem0)
- I made a mobile game you can only play on the toilet
NaturalCron – Human-Readable Scheduling for .NET (With Fluent Builder) [Developer Tools]
18 points, 3 comments
NaturalCron simplifies scheduling in .NET with human-readable expressions and a fluent builder.
- Replaces complex CRON syntax with natural language (e.g., "every 5 minutes on friday")
- Offers a Fluent Builder for type-safe and IDE-friendly scheduling
- Useful for code-based scheduling, config overrides, and UI display
- Available as a NuGet package with open-source GitHub repository
Discussion Link, Original Link
WebGPU enables local LLM in the browser – demo site with AI chat [ChatBots]
108 points, 37 comments
Local LLM runs in the browser using WebGPU, no API keys or installations needed.
- Runs entirely in the browser with WebGPU support
- No external API calls or OpenAI key required
- No software installation or local file downloads
- Models cached in the browser with user consent
- Hosted securely on GitHub Pages with transparent code
Discussion Link, Original Link
Wordle-style game for Fermi questions [Education]
27 points, 26 comments
A Wordle-style game for practicing Fermi estimation questions with daily challenges.
- Daily Fermi estimation questions (e.g., "How many new cars were sold in the US in 2024?")
- Win by guessing within ±20% of the correct answer in ≤6 tries
- Feedback after each guess (too high/low)
- Designed to improve numeracy and order-of-magnitude thinking
Discussion Link, Original Link
Open-sourced my prompt management tool for LLM-powered apps [Developer Tools]
3 points, 1 comments
Open-sourced prompt management tool for LLM-powered apps.
- Designed for managing prompts in LLM applications
- Open-source and freely available
- Helps streamline prompt organization and usage
Discussion Link, Original Link
F1 COSMOS – Live timing and data dashboard for F1 fans [Entertainment]
6 points, 3 comments
F1 COSMOS is a live timing and data dashboard for Formula 1 fans, offering real-time updates and comprehensive race analysis.
- Real-time live timing with millisecond updates for sector times, telemetry, and team radio
- Replay feature for past sessions, useful for different time zones
- Advanced data visualization including race analysis, championship standings, and technical updates
- Multi-device support with a smooth mobile experience and customizable desktop widgets
- Automatic timezone adjustment for the race calendar
- Supports multiple languages (English, Spanish, Japanese, Korean)
Discussion Link, Original Link
Minecrack – A simple, offline Minesweeper game for Android [Entertainment]
4 points, 5 comments
A lightweight, offline Minesweeper-style puzzle game for Android with a clean, distraction-free experience.
- Classic Minesweeper gameplay
- Multiple difficulty levels
- Works offline
- No login or ads
- Minimalist UI and retro-style design
Forced to Give Your Password? [Other]
3 points, 4 comments
Veilith offers deniable encryption with multiple passwords to protect sensitive data under coercion.
- Supports multiple passwords unlocking distinct data blocks
- Encrypted data indistinguishable from random noise
- Allows providing decoy passwords for plausible deniability
- Open-source with detailed whitepaper for transparency
Discussion Link, Original Link
Agentic AI Frameworks on AWS (LangGraph,Strands,CrewAI,Arize,Mem0) [Developer Tools]
4 points, 0 comments
Open-source reference implementations for building production-grade Agentic AI applications on AWS.
- Agentic RAG, memory, and planning workflows with LangGraph & CrewAI
- Strands-based flows with observability using OTEL & Arize
- Evaluation with LLM-as-judge and cost/performance regressions
- Built with AWS Bedrock, S3, and Step Functions
Discussion Link, Original Link
I made a mobile game you can only play on the toilet [Entertainment]
6 points, 1 comments
A mobile game designed exclusively for use while on the toilet.
- Playable only during toilet sessions
- Designed for short, engaging gameplay
- Unique concept targeting a specific scenario