Show HN Daily Selection (2025-10-22)

• Katakate – Dozens of VMs per node for safe code exec
• GoSMig – minimal, type-safe SQL migrations written in Go
• SierraDB – A Distributed Event Store Built in Rust
• I use ChatGPT these days to develop new features quickly
• Django Keel – 10 Years of Django Best Practices in One Template
• I'm rewriting a web server written in Rust for speed and ease of use
• ExprTk REPL – Explore math expressions in the browser with WebAssembly
• MTOR – A free, local-first PWA to automate workout progression
• I built TicketData – Ticket price trends and data for Sports & Concerts
• OpenJobHub – A Free and Open Job Board
• Realizing Karpathy's dream of Natural Language Programming
• Interactive timelines from Markdown – Chronos Timeline
• Apicat – A Lightweight Offline Postman Alternative

Katakate – Dozens of VMs per node for safe code exec [Developer Tools]

83 points, 36 comments

Katakate enables large-scale deployment of lightweight VMs for safe code execution, targeting AI-generated code, CI/CD runners, and off-chain AI DApps.

• Host your own infrastructure for lightweight VMs at scale
• Avoids Docker-in-Docker risks and complexity
• CLI/Python SDK for ease of use, especially for AI engineers
• Designed with defense-in-depth security principles
• Open to feedback and contributors with a clear roadmap

Discussion Link, Original Link

GoSMig – minimal, type-safe SQL migrations written in Go [Developer Tools]

3 points, 0 comments

GoSMig is a minimal, type-safe SQL migration library for Go with compile-time checks and no external dependencies.

• Minimal API with no DSL or file layout to learn
• Type-safe via Go generics
• Works with database/sql and sqlx out of the box
• Supports transactional and non-transactional migrations, rollback, status, and version tracking
• Includes a small CLI handler for custom migration binaries
• Compatible with PostgreSQL, MySQL, SQLite, MS SQL Server, and other SQL RDBMS
• Requires only basic interface implementations for integration with other database libraries

Discussion Link, Original Link

SierraDB – A Distributed Event Store Built in Rust [Developer Tools]

19 points, 1 comments

SierraDB is a distributed event store built in Rust.

• Distributed architecture
• Built with Rust for performance and safety
• Designed for event storage and processing

Discussion Link, Original Link

I use ChatGPT these days to develop new features quickly [Developer Tools]

3 points, 1 comments

One-sentence summary: A developer shares their experience using ChatGPT to accelerate feature development.

• Uses ChatGPT for rapid feature development
• Demonstrates AI-assisted coding efficiency

Discussion Link, Original Link

Django Keel – 10 Years of Django Best Practices in One Template [Developer Tools]

20 points, 17 comments

Django Keel is a production-ready Django starter template that consolidates a decade of best practices to eliminate boilerplate setup.

• Environment-first settings with 12-factor config
• Production-hardened security defaults
• Pre-configured linting, formatting, testing, and pre-commit hooks
• Ready-to-use CI workflow
• Scalable project structure
• Detailed documentation explaining trade-offs

Discussion Link, Original Link

I'm rewriting a web server written in Rust for speed and ease of use [Developer Tools]

66 points, 81 comments

A Rust-based web server rewritten for improved speed, ease of use, and modern features.

• Optimized performance for static file serving and reverse proxying
• Simplified configuration format for easier setup
• Automatic TLS enabled by default
• First release candidate now available with beta testing feedback incorporated

Discussion Link, Original Link

ExprTk REPL – Explore math expressions in the browser with WebAssembly [Developer Tools]

8 points, 0 comments

ExprTk REPL allows instant evaluation of math expressions in the browser using WebAssembly.

• Runs entirely client-side
• Near-native performance
• Supports complex math expressions
• No server-side processing required

Discussion Link, Original Link

MTOR – A free, local-first PWA to automate workout progression [Health]

3 points, 1 comments

A free, local-first PWA workout tracker that automates progressive overload and provides science-based performance analysis.

• Works offline and syncs encrypted between devices using passwordless passkeys
• Analyzes performance (weight, reps, RIR) and generates next-session targets
• Displays weekly volume, frequency, and recovery analysis on an anatomy model
• Includes session timer, automatic rest timer, and context-aware exercise alternatives
• Customizable UI (dark theme, languages, UI scale) and exercise library
• Flexible progression system with rep range and RIR target customization
• Supports drag-and-drop editing, unilateral tracking, and weight plate calculator

Discussion Link, Original Link

I built TicketData – Ticket price trends and data for Sports & Concerts [E-commerce]

6 points, 5 comments

TicketData provides free, real-time resale ticket price trends and forecasts for sports and concerts, helping users make smarter purchasing decisions.

• Tracks live resale prices from platforms like StubHub, Vivid Seats, and SeatGeek, updating every few minutes
• Offers price history for cheapest tickets, predefined zones, or custom seating areas
• Allows setting price alerts for specific thresholds
• Includes price forecasts for larger events using XGBoost models based on historical and live data
• Features 2.5 years of historical data, with plans to expand back to 2011
• Enables comparison of ticket prices across multiple events or venues

Discussion Link, Original Link

OpenJobHub – A Free and Open Job Board [Business]

3 points, 0 comments

OpenJobHub is a free and open-source job board designed to help engineers find jobs with transparent and accessible job information.

• Free and open-source platform
• Focused on engineering job listings
• Promotes job information transparency
• GitHub repository available for contributions
• Live website for job postings and searches

Discussion Link, Original Link

Realizing Karpathy's dream of Natural Language Programming [Developer Tools]

3 points, 2 comments

A tool for natural language programming inspired by Karpathy's vision.

• Enables programming through natural language commands
• Open-source project available on GitHub
• Aims to simplify coding by reducing syntax barriers

Discussion Link

Interactive timelines from Markdown – Chronos Timeline [Productivity]

10 points, 0 comments

Interactive timeline creation tool from Markdown with Obsidian plugin and developer library support.

• Create and share interactive timelines from plain text
• Available as an Obsidian plugin
• Developers can integrate timelines via chronos-timeline-md NPM library

Discussion Link, Original Link

Apicat – A Lightweight Offline Postman Alternative [Developer Tools]

13 points, 3 comments

Apicat is a lightweight, open-source offline alternative to Postman for local API testing.

• Stores .http files locally
• Git-friendly
• Highly compatible with Postman
• Free and designed for offline use

Discussion Link, Original Link