Thinkling: Idea Sketchbook

Catch an idea in two seconds — from Siri, the Action button, the share sheet or a widget — and watch it grow on an endless notebook page, drawn in real ink.

Thinkling is an endless notebook page. You catch an idea in two seconds, and it grows as you work on it.

Every idea is a mark of ink on the page — not a card, not a row in a list. A fresh idea is a light pencil loop. Give it branches, notes and threads, and its line gets traced over again, its words grow bolder, and little tendrils show where its branches went. Ideas you haven't touched in a while slowly fade, like pencil does. Zoom out and you see what you've really been thinking about.

CATCH IT ANYWHERE • Tap the pencil, write, done — it lands on the page. • "Catch a thought in Thinkling" to Siri, or on the Action button: a box pops up over whatever you're doing, and nothing opens. • Share a page from Safari, a line of text, a link from any app — straight onto your page or under the idea it belongs to. • Home Screen and Lock Screen widgets with your newest thoughts, and a Control Center button that opens the writing line.

STEP INSIDE AN IDEA Tap an idea and the camera flies into it: its branches bloom around it, its notes open, and the idea it grew from waits at the edge of the screen, in the direction it really lies.

PULL A LINE Hold an idea and pull a line out of it. Let go on empty paper and a new branch grows at the end; let go on another idea and you've tied a thread between them — and a thread can say something: this needs that, helps it, blocks it, leads to it.

MORE THAN IDEAS Questions, problems, to-dos, features, references and goals — each with its own mark. Tick them off: problems get solved, questions answered, features stamped DONE. Turn any idea into a list. Mark what's for now, soon or someday. Write the same thing twice and Thinkling notices, and lets you fold the two into one without losing a word.

YOURS, AND SAFE Your page lives on your iPhone and in your own iCloud — no account, no sign-up, no ads, no tracking. Save a copy of the whole page as a file any time; a copy is also kept every day on your iPhone. Thinkling sends a few usage statistics (like "a thought was caught"), never your words, notes, links or photos, and you can turn them off on the back of the page › PRIVACY.

FREE, ALL OF IT Every part of Thinkling is free. If it becomes your notebook, you can support it once — and as a thank-you get kraft, blueprint, graph and old-paper pages, a fountain pen, a brush and a crayon, four more inks, and the icon in other inks. No subscription, ever.

Paper or night ink. Fraunces and Caveat type. Everything on the page is drawn in code.