ToolHub
Streamline Tools, Master Productivity
No need for keywords — just describe the task and I'll find the right tool on this site.
Teach kids to tell time: switch between 12/24-hour formats, drag clock hands, sync with a digital clock, and compare 60/12/24 base differences.
BrightScreen interactive learning tool (built from h2ocloud/BrightScreen repository).
An asymmetric encryption interactive learning tool: understand HTTPS, SSH, and cryptocurrency cryptography through simulated public-key encryption and private-key decryption workflows.
An interactive single-page Circle of Fifths tool: explore key relationships, play chords, and take ear-training and key quizzes to help you understand the Circle of Fifths.
Yu-kai Chou's Octalysis gamification framework: score the eight core drives and instantly generate the octagon chart plus white-hat/black-hat and left-brain/right-brain balance analysis.
Real-time voice conversation with a local AI to practice spoken Chinese and English. Powered by local DGX Spark models: just start talking.
A RAG-powered review tool for an Obsidian vault: semantic search across 173 book-summary notes, AI Q&A (citing book titles), dynamically generated quizzes for automatic review, and a book knowledge graph.
Collects English words from book review for Anki-style spaced repetition (SM-2 scheduling, a daily due queue and flashcard grading; a spelling mode has you retype the word before flipping the card to reinforce memory). Also stores English definitions, synonyms and antonyms; tap a word in an example sentence for an instant lookup. For reviewing in the car, one tap turns your words into a short English passage read aloud sentence by sentence in bilingual Chinese-English, continuously and loopable (works on iPad/iPhone too). Playback prefers speech synthesized in order in your own voice, with audio saved in the phone's IndexedDB for zero-network offline replay; articles are kept for 15 days counted from the last read time (reading renews them), all read in Howard's voice.
A series of chaptered flashcard study games: bones, muscles, organs, constellations, the solar system, elements and parts. Every card includes Chinese and English names with pronunciation.
Cross-platform shell command knowledge base covering Bash, PowerShell, and CMD with searchable, categorized comparisons.
Trains your design taste, not color-blindness testing: first see the difference between good and bad through paired comparisons, then learn how lightness, proportion, saturation and the warmth of grays shape a palette's feel, and finally pick your own colors in scenario challenges (finance / children / luxury) and get concrete feedback. 60+ forced choices across the site; only after you choose is your intuition translated into numbers.
An exhaustive side-by-side of English grammar: the twelve tenses, four ways to express the future, five conditional types, the passive voice, and common-error comparisons. Example sentences are regenerated daily by an on-premise 35B model; the glasses version and the web version read the same read-only API.
Uses the browser microphone to identify chords, key and scale degrees in real time, and reports your instrument's reference pitch (A4 in Hz and how many cents off). Built-in tuner: pluck a string to see the note name, which string it is, and how many cents it is from the nearest semitone. Supports manually locking the key, movable-do / fixed-do modes (the key menu collapses in fixed-do; the two are mutually exclusive), capo shape conversion (-2 to 11 frets; negative = whole instrument tuned down a half or whole step) and Chinese/English switching. All audio is analyzed locally in the browser: nothing is uploaded or recorded, and there is no backend. Signal processing reuses the same algorithm as the Even G2 glasses version of Chord Ear.
A catalog of scores for practicing an instrument: every piece has three parallel layers (staff notation, guitar tab and movable-do numbered notation), with slow-down and section-loop playback, plus Guitar Pro files. The scores themselves are locked (mostly transcribed from other people's arrangements, for personal practice only).
One front door for the daily software-engineering and design-pattern lessons. Every issue lives here, and the URL can pin a single one. An on-premises model draws the day's questions, and RAG covers follow-ups. Tap an English word to look it up and save it to the vocabulary book.
A year of software engineering at one lesson a week: 52 weeks, 12 chapters, 58 stations, from computer basics, networks, security and operating systems through cloud and containers, version control, release management, hands-on databases with SQL practice, and front-end and back-end frameworks. Each station has a note for the PM. Supports a yearly syllabus, an instructor read-along, and review of missed questions. Drafted with AI assistance; an instructor still needs to review it.
A two-hour class on using an AI chat assistant, compressed into a 12-level quest map: tokens and the context window, pretraining and post-training, choosing a model, thinking models, web search, deep research, reading an uploaded file with you, a code interpreter and data analysis, artifacts and AI code editors, voice, seeing and generating images, and memory with custom GPTs. Each level is a short explanation plus a quiz (multiple choice, scenarios, ordering, fill-in, matching), with a book of misses, streaks, XP, a chapter chest and a closing summary. An appendix lists points you could borrow for a pi agent; those are inferences. Drafted with AI assistance. Progress stays in this browser.