
1dea - Idea book
Idea management
0 ratings
Free
Rating summary
About
Ideas never make an appointment. 1dea catches them in a second, files them without effort, and hands them back just when you had forgotten them.
Made for people who write, teach, research or simply think: aphorisms, quotes, talk outlines, hypotheses, reading notes, projects.
CAPTURE
• From the app, from the Share button of any other app, or with Siri and Shortcuts ("Add an idea").
• Markdown formatting: headings, bold, italic, highlight, lists, quotes, code, links.
• Formatting bar above the keyboard: code block, equation, highlight, bold, web link and backtick in one tap.
• Code coloured by language: Python, Swift, SQL… more than 190 languages in all.
• Automatic references: a DOI pasted into a note becomes a numbered call [1], and the full reference, in Nature style, is added at the end of the note.
• LaTeX equations, on their own line or in the middle of a sentence.
• The place where the idea came to you, added automatically if you wish.
GET INSPIRED
• A library of 22,539 ideas, in English and French: history, science, nature, film, music… to browse by category, by words or at random.
• Take an idea: it opens in a new note, for you to rewrite in your own words and file in your own categories, with its source link.
• Related ideas: those sharing the most words with the one on screen.
FIND
• Search by words, or by meaning: 1dea finds related ideas even when they share no word.
• Coloured categories, tags and one-to-three-star ratings to filter in one tap.
• Related ideas and links between notes to weave your thinking together.
• A world map of your notes.
• Ideas graph: a map of your notes and their links, in Tools.
REREAD
• Home Screen widget: a random idea, from the categories you choose, refreshed anywhere from every 15 minutes to once a day.
• "Random idea" in Siri and Shortcuts as well.
• Project note: gather several ideas into one working draft.
MEASURE
• Statistics by month, year, category and rating.
• Vocabulary tools: how many words you have written, how many are still ahead of you (Chao2 estimator), and how varied your vocabulary is (Shannon entropy).
SHARE
• Copy or share an idea as a quote, with your signature.
• JSON export and import of your whole library.
YOUR NOTES STAY YOURS
• No account to create: sync goes through your own iCloud, across iPhone, iPad and Apple silicon Mac.
• Search by meaning and statistics are computed on the device.
• The idea library is built into the app and works offline. For a reference, only the DOI is sent to doi.org to fetch its record.
• Lock with Face ID, Touch ID or passcode.
Free, no ads, no in-app purchases. In English and French.
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What's New in 1dea
3.1
November 12, 2026
Share ideas as instagram stories. Photo as a background












