Projects

Software I build and run myself. Each one shows how active it is, the parts I’m proudest of, and what changed lately.

In usePrivate

Citadel

My personal OS: one private address, three rooms. Only I can reach it.

Since Oct 2026Writes ptrtoj.com

Matrix

My task board: an Eisenhower matrix I place tasks on freely, with an Inbox, notes and a weekly review.

Since Oct 2026Phone and desktop

01Place, don’t sortFour quadrants sized by what matters, Do first always the largest; tasks go anywhere in them by drag and drop.

02Notes that linkMarkdown notes with math and checklists, links between tasks with backlinks, repeats and date nudges.

03An assistant that only suggestsClaude reads the board and proposes changes; nothing moves until I press Apply.

Vault

My portfolio, kept to the targets I chose: a brief every month, drift at a glance, news about what I hold.

Since Oct 2026KRX and US markets

01A monthly briefWhat moved, what’s coming up and what’s left to do this month, against the targets I chose.

02Drift at a glanceEvery holding against its target band, with the buy that brings it back.

03Gains in plain sightWhat each holding has made or lost since I bought it, in won, with the exchange rate counted for US shares.

Herald

Where I write: pages leave the Citadel for this site, one way only.

Since Oct 2026Writes ptrtoj.com

01Write beside the pageMarkdown beside a live preview in this site’s own look, with math, code and pictures.

02Sections that rememberEach section keeps when it was added and last edited, and the feeds announce only what’s new.

03One way outPublishing uploads plain files; nothing on this site can reach back into the Citadel.

Across the rooms

01Private by designOnly I can reach it.

02An assistant in every roomClaude reads the room I’m in and proposes changes as cards; nothing changes until I press Apply.

03Nothing lostEncrypted nightly backups, a restore rehearsed automatically, and any minute of the last 30 days on top.

Recent updates

Oct 24, 2026ImprovedThe public site (not yet public): About says how the site is served, and Citadel's card on Projects says simply that only I can reach it.

Oct 24, 2026ImprovedThe tabs have new names: Tasks is now the Matrix, Portfolio is the Vault and Publish is the Herald; the links back from Settings and the Herald say Matrix too.

Oct 24, 2026ImprovedThe Vault uses US market colours: green for gains and for a sleeve above its target, red for losses and for one below.

Oct 24, 2026ImprovedPrivate view blurs harder, so amounts and notes can't be read over your shoulder.

Oct 24, 2026ImprovedAmounts of a billion won or more read in billions, like ₩1.2B.

Oct 24, 2026NewNew on the Vault tab: what each holding has gained or lost, from the average price (and, for US holdings, the average ₩/$) you type in Settings › Vault; the total sits in the donut's centre. The Assistant can fill them in for you as a card.

LiveWeb

Noxtheca

The night library: keep a passage on one side of a card, your own thoughts on the other.

Visit noxtheca.com ↗

Since Oct 2026v1.13Phone first, Day and Night

What I’m proudest of

01The two-sided cardA passage on one side, your own thoughts on the other, ruled like a legal pad, with math that looks right.

02Written by peopleAI is kept from writing for readers and AI crawlers are kept out, and the site says plainly that no one can block AI entirely.

03CiteChicago, MLA, APA or IEEE in one tap, ready to paste into an essay.

Recent updates

Full update log ↗

Oct 16, 2026NewComments on any Luc, and a notification bell for comments, lamps, lines and new followers.

Oct 15, 2026ImprovedCopy became Cite, with a choice of citation style.

Oct 15, 2026FixedPages with dates and times open smoothly in Safari on iPhone and Mac.

Oct 15, 2026FixedThe card image shown when sharing a Luc appears reliably again.

Oct 13, 2026NewA Books view on each theca groups Lucs by book.

Oct 13, 2026NewPublic launch: the doors open.

LiveWebApp coming

idot.kr

Quizzes, a wrong-answer notebook and analysis of every try, on the web and as an app.

Visit idot.kr ↗

Since Oct 2026v1.19Phones first

What I’m proudest of

01Quiz analysis (쪽지시험 분석)Item analysis over every try: how well each question tells students apart, the spread of correct rates, first versus later tries, and when students study.

02The appAn iPhone and Android app with alerts for new notices and quizzes, in preparation now.

03Wrong-answer notebook (오답노트)Every wrong question gathers by itself; pin one to keep it on top, mark it studied, and it comes back if missed again.

Recent updates

Full update log ↗

Oct 23, 2026ImprovedReading assignments show each book’s ISBN, and the login screen’s guidance is clearer.

Oct 23, 2026NewParents and students see class updates: absences, lateness, missing homework and test retakes.

Oct 22, 2026NewStudents and parents see the last eight weeks of grades and published exams.

Oct 22, 2026NewDays left until school exams on each family’s own page.

Oct 19, 2026NewWrong answers gather in a notebook by themselves.

Oct 17, 2026NewLaunch: notices, weekly homework and the first phone quiz.

In usePrivate

claude-defaults

The rulebook my Claude Code teams work by: seven sessions, three branches, and one person who decides.

Since Oct 2026v2.0.113 releases in five days

claude-defaults, a screen of the product

What I’m proudest of

01Teams, not one sessionDesign, Build, Rehearsal, Refactor, Red, Ship and Upkeep each run as their own session, folder and branch, so no session checks its own work.

02Queues, not a clipboardWork passes between teams as handoffs that wait in each team’s queue; I type next instead of copying prompts between terminals.

03Nothing ships without a previewEvery change you can see on a screen is approved on a private preview page first, with screenshots at the sizes that matter.

Recent updates

Oct 19, 2026ImprovedEvery step I have to take comes with its exact command, and a session finds the command out before asking me.

Oct 19, 2026NewHandoffs wait in each team’s queue instead of being carried by hand; a team takes the next one when I type next.

Oct 19, 2026NewA method for the Refactor team: find hotspots with evidence, build the safety net first, and never mix structure and behaviour in one commit.

Oct 19, 2026ImprovedEach project’s instructions file stays small; history and long reference move to their own documents.

Oct 19, 2026FixedFixed an important security issue.

Oct 19, 2026ImprovedReplies are reports in sections under emoji headings, always in the same order, with my steps in one place only.

Oct 19, 2026NewEvery preview page names the session that made it, so I answer in the right terminal.

Oct 17, 2026NewEvery reply lists the prompts to paste into other sessions, in order.

Oct 17, 2026FixedFixed a security issue.

Oct 17, 2026NewTwo new teams: Content, for what readers read, and Head, a front desk that turns any idea into a plan by team.

Oct 17, 2026NewEvery change you can see on a screen is approved on a private preview page before it counts as done.

Oct 17, 2026NewMy steps are lettered a., b., c., so I can answer “a. DONE”; a step I skip comes back.

Oct 16, 2026ImprovedEvery session checks whether its project follows the newest rules and asks before updating.

Oct 15, 2026NewFirst release: two projects’ instructions merged into one, free of any one stack or country, with a stable ID for every rule.