Project updates

2026-06-04 / Beginner Unity and Unreal courses

• Added unity-basics: a 12-chapter Unity 6.3 LTS beginner course covering editor concepts, C# scripting, a 2D project, UI, data, debugging, Git, and builds.
• Added unreal-basics: a 12-chapter Unreal Engine 5.7 beginner course covering editor concepts, Blueprints, gameplay framework, a 3D prototype, UMG, packaging, and Git LFS.

2026-06-04 / Beginner Git and Godot courses

• Added git-basics: a 10-chapter beginner course covering Git setup, commits, branches, remotes, conflicts, and safe collaboration.
• Added godot-basics: a 12-chapter Godot 4.6.3 beginner course covering editor concepts, GDScript, a 2D game project, debugging, version control, and export.

2026-05-24 / Cloudflare Worker deployment and auth

• Moved deployment to Cloudflare Workers Static Assets with a Worker entry for API routes.
• Added D1-backed visit tracking, public aggregate traffic cards, hidden admin login, and admin stats API.
• Kept courses public and changed successful login to return to the homepage instead of automatically opening Study.

2026-05-22 / Crypto key and IV history

• Added history dropdown for secret key and IV inputs in crypto tools.
• History is stored in localStorage and deduplicated (max 10 entries per field).

2026-05-21 / AI Chat multi-provider

• Replaced AI utility tools with a unified AI Chat supporting OpenAI, Anthropic, Gemini, DeepSeek, OpenRouter, SiliconFlow, and custom OpenAI-compatible providers.
• Added provider selection, model fetching, streaming responses, temperature and max tokens controls.
• API keys are stored in localStorage only, never sent to backend servers.

2026-05-21 / Andrew Ng Deep Learning course

• Added ng-lectures: a 28-chapter bilingual course covering ML fundamentals, neural networks, CNN, RNN, and generative AI.
• Registered alongside transformer-lectures in the study section with full i18n support.

2026-05-20 / Base64 Image decode

• Added decode mode to Base64 Image tool. Accepts Base64 with or without data URL prefix.
• Auto-detects image format (PNG/JPEG/GIF/WebP/BMP/SVG) from file headers when decoding.

2026-05-20 / crypto encoding and modes

• Added key/IV/input/output encoding support (text, Base64, Hex) for AES, DES, SM4, Hash, and HMAC.
• Fixed SM4 by converting key/IV to 32-char hex and bridging base64/hex input-output.
• Expanded DES to CBC, ECB, CFB, OFB, and CTR modes with configurable padding.
• Added Padding selection for AES-CBC, AES-ECB, DES, and SM4.
• Updated all crypto tool descriptions to reflect new encoding and mode capabilities.

2026-05-20 / crypto and usage tracking

• Added AES-ECB support and configurable padding (PKCS7, NoPadding, ZeroPadding, etc.).
• Fixed IV state not resetting when switching AES/SM4 algorithms.
• Fixed SM4 CBC IV validation and ECB/SM4 key empty-string detection.
• Replaced Featured Tools with Recently Used, sorted by usage frequency via localStorage.

2026-05-20 / i18n support

• Added client-side i18n with English and Chinese language support. Language preference is cached in localStorage.

2026-05-20 / v0.1.0

• Implemented the static Next.js frontend for GitHub Pages and custom domain deployment.
• Added local-first tools for crypto, data, and online workflows.
• Added MDX study roadmaps and project handoff documentation.