Retired — kept alive, not maintained

The old toolbox.
Retired, still online.

These browser utilities still work, but they're no longer the lab's focus. The lab builds agentic systems now: fullhouse (coming soon), soloteam-cli, md-anything. Looking for agent capabilities? See Skills. ← back to the index

§ 01

The Archive

8 utilities · still onlineLab focus moved to flagships.
001 Open ↗
Pretext Playground
EXP-002 lab demo: @chenglou/pretext predicts multiline text size with zero DOM reflow. Live heights, bubbles, columns and accordions. Free, no signup needed.
002 Open ↗
LLMs.txt Generator
Free llms.txt generator: build an AI-readable Markdown map of your site for AI agents, published at your domain root. No API key, no crawl service, no signup.
003 Open ↗
Code Editor
Free online code scratchpad with Monaco highlighting for 10 languages. Drafts autosave in your browser and export in one click. No signup, nothing uploaded.
004 Open ↗
Password Generator
Free password generator with crypto-grade randomness. Create strong 20+ character passwords locally in your browser — nothing stored, nothing sent, no signup.
005 Open ↗
CLV Calculator
Free customer lifetime value calculator for founders: turn price, cost, repeat purchases and CAC into CLV, margin and LTV:CAC. Runs locally, no signup.
006 Open ↗
JSON Viewer
Free JSON viewer and validator: format, minify and explore JSON as a tree with byte size, depth and root type. Client-side only, nothing uploaded, no signup.
007 Open ↗
Character Counter
Free character counter with live words, sentences, paragraphs and reading time, plus X, Instagram, LinkedIn and SEO limits. Private, client-side, no signup.
008 Open ↗
UTM Builder
Free UTM builder for GA4 campaign URLs: source, medium, campaign plus id, term and content. Tagged links built locally in your browser — offline, no signup.