Write
An editor with headings, lists, to-dos, quotes and code. Every note has its own icon, colour and tags.
Note-taking app and knowledge maps
Your notes, connected.
Type [[title]] in a note and it links to another one. Noos turns those links into maps you can explore as a graph or arrange by hand on a canvas.
Prefer the browser? Start for free at usenoos.com →
How it works
You write, you link, and your links build the map.
Link
Type [[ and pick a note, or create a new one with that title. Every link is a relation, and you can give it a type: “student of”, “depends on”, “contradicts”.
Explore
A space can hold several maps, each with the notes you choose. The same note can appear in several maps without being duplicated.
Two ways to see the same notes
Both views use the same notes and relations. Each map remembers the one you used last.
Automatic graph
It lays itself out from the relations and stays put while you work. Press “Re-arrange” whenever you want a new layout.
Free canvas
Drag each note where it belongs: by topic, by period, or however helps you think.
More features
To work with others, publish, and take your notes with you whenever you like.
Shared spaces
Invite people with a link as readers or editors, with an expiry date. While someone edits a note, nobody else can overwrite it.
Public maps
Publish a map with a read-only link; no account needed to view it. Only its notes are shown, without authors or emails.
Import and export Markdown
Bring your notes from Google Keep, Apple Notes or .md and .txt files. And take them with you in a .zip with one .md per note, ready to open in Obsidian.
Quick capture
Save text and links from any web page with the “Save to Noos” button in your bookmarks bar, without leaving what you are reading.
Search
By title, content and tags across all your spaces, or inside a map to jump to a note.
30-day trash
Notes, maps and spaces you delete can be restored for 30 days.
End-to-end encryption
Optional. Turn it on in your profile and your notes are encrypted on your device before they leave it: not even we can read them.
Only you hold the key
Titles, summaries, text, sources and the names of spaces, maps and tags are encrypted. The server sees icons, colors, dates and which notes link to each other, but not what they say.
Your devices and 12 words
Link your other devices with a QR code. If you lose them, you get the key back with your 12 words. Without them nobody can recover your notes, not even us.
Share and publish as usual
Shared spaces are encrypted for each member. A public map carries its key in the link itself and only opens the notes in that map.
On your phone too
Join the beta for iPhone or Android and we'll send you the link to install it. It also works in your phone's browser, and you can install it from there as an app.
If you lose your connection with Noos open, you can still read the notes you had already loaded.
The betas are invite-only: we email you the TestFlight link (iPhone) or the Google Play link (Android). App Store is a service mark of Apple Inc. and Google Play is a trademark of Google LLC.
Free
No card needed. Every account includes:
5spaces of your own
500notes
50 MBof storage
Spaces other people share with you don't count, and neither does the example space.
Create my accountFrequently asked questions
What is Noos?
A note-taking app where you link one note to another by typing [[title]]. From those links, Noos draws knowledge maps that you can view as a graph that lays itself out or arrange by hand on a canvas. It works in the browser and has beta apps for iPhone and Android.
What is a knowledge map?
A drawing of ideas and how they relate: each idea is a point and each relation a line. In Noos each note is a point and each [[ ]] link a line you can give a type, such as “student of” or “contradicts”. A space can hold several maps, each with the notes you choose.
Is Noos free?
Yes, and no card is needed. Every account includes 5 spaces of your own, 500 notes and 50 MB of storage. Spaces other people share with you don't count.
Can I bring my notes from Google Keep or Apple Notes?
Yes. From Google Keep, with the .zip you download from Google Takeout. From Apple Notes, by exporting each note as Markdown (iOS 26 or macOS 26). You can also import .md and .txt files from other apps; [[ ]] links arrive as text.
Can I take my notes to Obsidian?
Yes. Export a space, a map or a single note to a .zip with one .md per note. Links between notes come out as [[ ]], so Obsidian recognises them.
Who can read my notes?
Only you and the people you invite to a space can see it. Anyone with the link can see a map you publish. If you turn on end-to-end encryption, your notes are encrypted on your device before they leave it and not even we can read them.
Does it work on my phone and offline?
It works in your phone's browser, and you can install it from there as an app. The iPhone and Android apps are in invite-only beta. Offline, you can read the notes you had already loaded.
Try it with an example
The tutorial can set up an example space about ancient Greece, with notes, [[ ]] links and a map already in place, so you can see how it all fits together. For now the example is in Spanish.
Start for free