Scrappy is a prototype tool designed for creating home-made apps, allowing users to craft personalized software for themselves and friends. It empowers the DIYer to create apps tailored to specific needs without extensive programming expertise. Scrappy provides a canvas-based environment similar to Figma, where users can incorporate interactive elements and share apps effortlessly, promoting collaboration. The tool aims to democratize software creation, fostering creativity and custom solutions beyond mass-market offerings. 

system prompt
Anthropic has released the system prompts for their Claude 4 models, providing insights into prompt engineering and model personalities. The prompts offer guidance on effective use, limiting hallucinations, and maintaining model safety while they detail Claude's capabilities, including its preferences for conversation styles and ensuring copyright compliance.

A comprehensive comparison between TanStack Form and React Hook Form for React applications. TanStack Form offers better type safety, framework-agnostic support, and advanced features for complex forms, while React Hook Form provides simpler APIs and broader community support. The choice depends on project complexity - React Hook Form for simple forms and quick setup, TanStack Form for large-scale applications requiring advanced form management capabilities

A comprehensive checklist covering frontend performance optimization techniques for 2025, including HTML optimization, CSS best practices, JavaScript management, image and video handling, font optimization, and server configuration. The guide emphasizes the business impact of performance, with statistics showing that faster sites see higher conversion rates and better user engagement. Key areas covered include lazy loading, modern image formats like WebP/AVIF, code splitting, CDN usage, and Core Web Vitals optimization. The checklist is platform-agnostic and provides actionable steps for developers to build faster web applications.

A GitHub repository collecting leaked system prompts from popular LLM-based services. The project accepts contributions through pull requests with verifiable sources and reproducible prompts, while avoiding sensitive commercial code to prevent DMCA takedowns. The repository serves as a research resource cited in academic papers.

JetBrains outlines the benefits of migrating from Cursor to IntelliJ IDEA, highlighting IntelliJ's native AI capabilities, out-of-the-box configuration, and enterprise-ready features. The guide covers how to import settings and recreate familiar workflows, positioning IntelliJ IDEA as a more scalable solution for both beginners and professional developers working on complex projects.

LocalStorage poses security risks for storing JWT tokens due to XSS vulnerability and lack of browser security features. A safer approach uses access tokens stored in memory (lost on page refresh) combined with refresh tokens in secure HttpOnly cookies. This pattern reduces XSS attack surface, ensures session expiry on tab close, and leverages browser cookie security flags. Token rotation further enhances security by invalidating refresh tokens after each use.

Rick Rubin explores the concept of vibe coding by merging ancient philosophy with modern coding practices, assisted by Claude AI from Anthropic. The post discusses themes of creativity, duality, and effortless coding, encouraging readers to use AI to transform code artifacts and develop dynamic visualizations.

A programmer shares his five-year experience of switching all devices to UTC instead of local time zones. The approach eliminates mental conversion overhead, provides consistency during travel, and simplifies scheduling for remote workers. While there are minor downsides like explaining the setup to others and converting 12-hour local times, the author found it significantly improved productivity and time management across global schedules

Apple's new Liquid Glass design aesthetic for version 26 operating systems creates complex visual effects with light refraction, distortion, and frosted glass appearances. Web developers are recreating this look using CSS backdrop-filter, SVG filters like feDisplacementMap and feGaussianBlur, and React components. The technique involves multiple parameters including displacement scale, blur amount, saturation, and aberration intensity. However, implementing liquid glass effects raises significant text contrast accessibility concerns that developers must carefully address when placing text over unknown backgrounds.

The post explores the idea of combining the convenience of digital calendars with the flexibility and personal touch of paper calendars. It discusses the limitations of current digital calendar apps, which often lack personalization and flexibility, and the unique advantages of paper calendars. The goal is to create a 'sketchy calendar' that offers interconnected views, personalization, and dynamic functionality while maintaining a personalized, sketch-like quality.

Analysis of Claude 4.0's system prompt reveals how Anthropic uses natural language instructions to program chatbot behavior. Key changes include removal of old hotfixes (now handled in training), encouragement of search functionality, expanded artifact use cases, context optimization for coding, and new cybersecurity guardrails. The 23,000-token system prompt consumes 11% of Claude's context window and demonstrates a user-driven development cycle where observed behaviors are first addressed through prompt modifications, then incorporated into model training.

A web-based simulator that replicates Air Lab firmware functionality, allowing users to interact with virtual environmental sensors through different simulated environments. The simulator includes device controls, USB connectivity simulation, and menu navigation features, providing a hands-on experience without requiring physical hardware.

AI coding tools like Claude Code enable developers to generate working code without reading it, but this practice leads to three critical issues: architectural decay, loss of domain knowledge, and security vulnerabilities. The author advocates for two responsible approaches: fast prototyping with post-session review for peripheral features, and synchronous pair-coding for core functionality. A comprehensive checklist covers architecture consistency, security scoping, meaningful tests, documentation, error handling, and performance considerations.

A comprehensive collection of open-source tools tailored for designers and creative professionals to enhance their work.

AI systems are actually more transparent than human intelligence when it comes to understanding their internal workings. While AI is often called a "black box," researchers can inspect every neural connection in open-source models, trace concept paths through networks, and determine input importance - capabilities far beyond what's possible with human brain analysis. Even closed-source AI models can be studied through controlled interrogation and distillation techniques. The human brain remains more opaque due to physical and ethical constraints on research, making AI the more interpretable intelligence despite popular perception.

The post discusses emerging open data standards in the data world including Postgres, Open Telemetry (OTel), and Iceberg. These standards are underpinned by important open source tenets: OSI-approved licensing, the feasibility of self-hosting, and vendor neutrality. Postgres has become a standard due to its compatibility across platforms and non-ownership by any single entity. OTel is gaining traction among major cloud providers for its telemetry capabilities, while Iceberg is leading in OLAP standards. The emphasis is on achieving portability and interoperability, particularly with AWS's S3, enhancing data management and reducing vendor lock-in.