Cocoa Notes vs Obsidian

Where Obsidian wins, honestly

Obsidian is a genuinely great piece of software and it is free. Before anything else, here is where it beats Cocoa Notes outright:

• It runs everywhere. Mac, Windows, Linux, iOS, Android. Cocoa Notes is macOS only today; an iPad version is planned but not built.
• The plugin ecosystem is enormous. Over a thousand community plugins. If you can describe a workflow, someone has probably built it.
• The graph and backlinks go deeper. Cocoa has [[note links]] and a backlinks panel, but Obsidian's linking model is the thing it was designed around.
• It is free forever, with sync sold separately.

If any of those four matter more to you than what follows, stop here and use Obsidian. It is the right answer for a lot of people.

Where they are the same

This is the part most comparisons get wrong, so it is worth stating plainly: on file ownership, Cocoa Notes and Obsidian are the same.

Both write plain .md files into a folder you choose. Both let you open that folder in Finder, copy it, back it up, or point another app at it. Neither hides your writing in a database. If you leave either app, your notes are still sitting there as text.

So "your notes are files" is not a reason to pick one over the other. It is a reason to pick either of them over Notion, Evernote or Apple Notes.

The actual difference: what a highlight is

In Obsidian, highlighting is ==text==. It makes the text yellow. That is all it is — one colour, no meaning attached, and nothing downstream happens because of it.

In Cocoa Notes a highlighter has a name. You define pens like Formulas, Terminology, Dates, On the Exam, and each pen can be set to collect and to make cards. Mark a formula with the Formulas pen and three things happen at once:

1. It is tinted on the page.
2. It joins the Formulas collection — every formula you have marked, across the whole course or the whole library, in one list, each row a click away from the sentence it came from.
3. If that pen makes cards, it becomes the front of a flashcard.

From there Cocoa builds recall sessions that schedule what you keep forgetting, quizzes, and full exams that mark you at the end. You never author a card.

"But there are Obsidian plugins for that"

There are, and they are good. Spaced Repetition, Flashcards, and others will turn tagged text into Anki cards or run reviews inside Obsidian.

The honest comparison is not capability, it is assembly. To get to something like Cocoa's study flow in Obsidian you choose between several plugins that do it differently, learn the syntax each expects, decide whether cards live in Obsidian or export to Anki, keep those plugins working across updates, and accept that around a third of community plugins do not support mobile.

That is a completely reasonable thing to enjoy doing. Plenty of people find it satisfying. But it is work you do before you get any studying done, and it is work you redo every time the setup drifts. Cocoa's position is that for a student mid-semester, the study system should be there when the app opens.

Side by side

Can you use both?

Yes, and this is a real option rather than a diplomatic ending. Because both apps read and write the same plain Markdown in a normal folder, you can point Obsidian at your Cocoa folder and both will work on the same notes. Write and highlight in Cocoa on your Mac, read and edit in Obsidian on your phone.

Two things to know if you do: Cocoa's search index lives outside the notes folder and rebuilds itself, so nothing gets corrupted; and Obsidian will show <mark class="…"> tags as visible HTML depending on your settings, which some people find distracting and others do not notice.

Who should switch

Switch to Cocoa Notes if you are a student on a Mac, you highlight while you read, and the gap between "I highlighted it" and "I have studied it" is where your time actually goes.

Stay with Obsidian if you need your notes on a phone, you have already built a setup that works, or the tinkering is part of the appeal.