A note app that makes digging deeper fun
When something in a note is unclear or you want to know more about it, Cognicull lets you turn it into a “deep dive note”. You can dig even deeper from a deep dive note. The notes you dig into appear at the top of the screen, connected below the note they came from.
iPhone (iOS 17 or later)
Dig deep into a single note
When you look into or think about something, things come up along the way that you want to check or learn more about. In Cognicull, you write those in deep dive notes and connect them to the original note.
For example, in the screen at the top, three deep dive notes are connected to Sleep quality:
At the top of the screen, Sleep quality is at the very top, and the three notes below it are these three notes, in the same order.
How it works
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Write
Start by writing what you want to look into or think about in a single note.
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Dig deeper
Dig into what’s unclear or what you want to know more about with a deep dive note.
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Dig even deeper
If something in a deep dive note catches your interest, dig deeper again. The more you dig, the further the connected notes at the top of the screen extend downward.
When you dig deeper
Keep the original note’s flow
Adding what you dug into to the original note breaks the flow of its explanation. Keep it in deep dive notes, and the original note still reads as it was meant to.
Take it one step at a time
You turn each thing that catches your interest into a deep dive note, one at a time, so you don’t have to look into or understand everything at once.
Keep the path you followed
What caught your interest and what you looked into remain as connected notes. When you read back later, you can follow the same path again.
Built for digging deeper
The view follows your dive
At the top of the screen, deep dive notes open only under the note you select. Even as your notes grow, you can keep digging while seeing just the path you took and what lies ahead.
Reuse notes you’ve written
Any note can also be connected as a deep dive note of other notes, so you don’t have to write the same explanation twice.
Automatic layout
The app arranges the notes for you. With no positions to adjust, you can spend your time writing and digging deeper.
Automatic links
When the title or a keyword of a deep dive note connected below appears in a note’s text, it becomes a link automatically, however many levels down that note is.
Write
Each note has a title and a body. You can edit the body anytime, and changes are saved automatically. The body can include:
Organized for reading
Organize with headings, lists, boxes (note, caution, code) and images. A table of contents is made from your headings automatically.
Math
Type it in TeX for a clean display. If you don’t know how, ask an AI such as ChatGPT to “write it in TeX”.
Interactive figures
Add an HTML file to the body, and animations and interactive figures run right in it. Ask an AI to “make it as a single HTML file” to create your own.
List and search
The top screen lists the notes you edited most recently.
- Search by title, keyword or body text
- Create your own collections, such as favorites or works in progress
- An automatic “Uncategorized Notes” list of notes that aren’t in any collection
Your data
Works offline
Use it without an internet connection.
iCloud sync
Notes, connections, collections and images sync across devices signed in with the same Apple Account. No servers of ours are involved.
Automatic backup
On days with changes, the app backs up on your device automatically (the latest 7). You can also export everything to a single file.
No sign-up or ads
No account sign-up, ads or tracking.
iPhone (iOS 17 or later)