# 1dea - Idea book — Idea management > Idea management (iPhone/iPad app by 1O1IN.) - Source: https://appshunter.io/ios/app/1dea-idea-book/id6754333191 (this page in markdown: same URL + `.md`) - Developer: [1O1IN](https://appshunter.io/developer/412439635) - Category: Productivity, Reference - Price: Free - Age rating: 4+ - Requires: iOS 18.6 · 30 MB - Languages: American English, French (France) - Released: 2025-10-31 - Data updated: 2026-10-25 ## What is 1dea? 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. ## Is 1dea safe? Not enough ratings yet to assess 1dea. ## Is 1dea legit? 1dea - Idea book appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for 1dea is 75 out of 100 points across 7 verification signals from App Store and developer data. ## Version history (last 5 releases) ### 3.0 — 2026-10-24 • Idea library: 22,539 ideas in English and French, to browse by category, by words or at random. Take one and it becomes a new note, with its source link, that you rewrite and file in your own categories. Built into the app, it works offline. • Automatic references: paste a DOI and it becomes a numbered call [1], while the full reference, in Nature style and with its DOI, is added at the end of the note. Offline, the DOI stays as it is and is handled at the next save. • Coloured code: a "```python" block shows in its language's colours, in light and dark mode alike. • Formatting bar above the keyboard: code block, equation, highlight, bold, web link and backtick, without hunting for symbols on the iPhone keyboard. ### 2.9 — 2026-10-14 Performance improvement bag of words ### 2.8 — 2026-10-06 - Share ideas as images - Several possible signatures - Speed up indexage for large databases ### 2.7 — 2026-09-30 - Knowledge graphs - Indexation improvement - Improved URL sharing with 1dea ### 2.6 — 2026-09-26 • Vocabulary tools: words written, estimated vocabulary and Shannon entropy. • LaTeX equations in the middle of a sentence. • Every note shows its number in the list. • Line breaks are kept as you typed them. • List previews stop at ten lines. • A category created from an idea is selected right away. • Renaming a category to an existing name merges the two, without losing a note. • Sort ideas newest first or oldest first. • Your location is no longer added to copies and shares unless you ask for it. • No more imposed categories, no more notification prompt. ## Apps similar to 1dea | App | Rating | Price | Category | | --- | --- | --- | --- | | [Voice Recorder & Memo - Murmur](https://appshunter.io/ios/app/voice-recorder-and-memo-murmur/id6785017620) | — | Free | Productivity | | [Voice Recorder: AI Note Taking](https://appshunter.io/ios/app/voice-recorder-ai-note-taking/id6757492184) | 5.0 (3) | Free | Productivity | | [Viska: Local AI Meeting Notes](https://appshunter.io/ios/app/viska-local-ai-meeting-notes/id6757442705) | 5.0 (2) | $6.99 | Productivity | | [Leaf Note: Markdown Notes](https://appshunter.io/ios/app/leaf-note-markdown-notes/id6504428581) | 4.0 (1) | Free | Productivity | | [Dictly — On‑device dictation](https://appshunter.io/ios/app/dictly-ondevice-dictation/id6752733596) | 3.5 (4) | Free | Productivity | | [Dicte: AI Meeting Assistant](https://appshunter.io/ios/app/dicte-ai-meeting-assistant/id6476149964) | 5.0 (4) | Free | Productivity | ## More apps by 1O1IN - [AyurHF](https://appshunter.io/ios/app/ayurhf/id412709978) - [camip](https://appshunter.io/ios/app/camip/id412783632) - [alphone](https://appshunter.io/ios/app/alphone/id412810263) - [jungian](https://appshunter.io/ios/app/jungian/id414065600) - [DNAWhirl](https://appshunter.io/ios/app/dnawhirl/id415171366) - [DevaWhirl](https://appshunter.io/ios/app/devawhirl/id416437757) All apps by 1O1IN: https://appshunter.io/developer/412439635 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-25.*