Second Brain

One page that holds the things a productivity app usually spreads across five: projects, tasks, habits, studying, exercising, finances, a journal, courses, notes, and a map of how all of it connects.

It runs in your browser. There is no server, no account, and nothing is sent anywhere unless you switch on a sync you control. Open the file, start typing.

Try it — nothing to install, nothing to sign up for.

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What is in it

Dashboard	Today at a glance: what is due, what you have logged, where the month stands.
Map	Everything you keep, drawn as a graph. Drill from a kind of thing, to one thing, to what it touches. [[Double brackets]] link by title, the way Obsidian does, and you can draw your own links.
Projects & tasks	Priorities, deadlines, progress, a board, and tasks that belong to projects.
Habits	A daily grid, streaks, and a heatmap of the month.
Studying & exercising	Sessions and workouts against a weekly target — plus a library of 208 exercises with instructions, form tips, common mistakes and a video for each, and six programmes that drill from plan to day to movement.
Finances	Income, spending, budgets, savings goals, and credit cards whose charges only count as spending once you mark them paid.
Journal	An entry a day with mood, a streak, and a calendar.
Notes	Categories, pinning, and to-do lists: write - [ ] something and it becomes a box you can tick.
Car maintenance	Fuel and service logs with cost per kilometre — optional, and driven by a Google Sheet.

Everything is searchable from one box (Ctrl K), and exports to CSV or JSON whenever you want to leave.

Themes

Light, dark, or whatever your device is set to, in six accent colours. The whole app recolours: buttons, charts, progress rings, heatmaps. There is a living background of drifting, linked points, numbers that count up rather than snap, and a small burst when you finish something — each of which you can switch off, and all of which stop for prefers-reduced-motion.

Two builds, one brain

• app.html — the laptop build, with a sidebar and keyboard shortcuts.
• m.html — the phone build, with bottom tabs, sheets and a home-screen icon.

They share their data and every module between them, so a change lands in both. index.html sends you to whichever suits the device you are on.

Your data

It lives in your browser's local storage, which means it is on your device and nowhere else. Three optional ways to move it:

1. Export — JSON for a full backup, CSV per section for a spreadsheet.
2. A private GitHub gist — paste a token with only the gist scope and your devices merge item by item, newest edit winning, deletions remembered.
3. Google Sheets — a small Apps Script of your own (in apps-script/) so expenses, fuel and services live in spreadsheets you already keep.

Nothing is enabled by default. No analytics, no telemetry, no third-party scripts — check for yourself, it is one file.

Accounts, if you want them

supabase/ has everything needed to run this for more than one person: a schema with row-level security so an account can only ever read its own rows, and a client that signs people up, signs them in and syncs per item. Point cloud-config.js at a Supabase project and the app grows a sign-in screen and an account menu. Leave it as it is and the app stays local-first.

Running it

Open app.html. That is the whole installation.

To put it online, this repository is already a static site — fork it, turn on GitHub Pages, and your copy lives at https://<you>.github.io/<repo>/. On a phone, open that address in Safari or Chrome and add it to your home screen.

Built with

Plain HTML, CSS and JavaScript. No framework, no build step, no dependencies, no CDN. The exercise library comes from fitness-app.

Licence

MIT — see LICENSE. Take it, change it, make it yours.