AI / Tool
Bilingual Tone Checker
Check Chinese and English message tone with a local bilingual analyzer for emails, chats, and short drafts.
kbwen Lab
Useful tools, experiments, and small web apps.
A collection of lightweight tools for AI, quant finance, developer workflows, and playful experiments.
Featured Tools
Hand-picked utility tools ready for immediate use across daily workflows.
Quant / Math
Kelly Calculator
Calculate Kelly criterion position sizing with full, half, and quarter Kelly bands from win rate and profit-loss ratio.
Dev / Tool
HTML Entity Encoder
Encode or decode HTML entities locally for markup, escaped text, and copy-ready snippets.
Dev / Json
JSON Formatter
Format, minify, and validate JSON with syntax error hints for API payloads, config files, and webhooks.
Explore by Category
Browse our core collections. Each category houses focused tools designed for specific domains.
Category
AI
AI experiments and utilities.
Category
Dev
Developer tools and helpers.
Category
Games
Small playable experiments.
Category
Experiments
Early tools, prototypes, and cross-category builds.