I’ve been hearing about Octarine for a while. It’s one of those apps that people whose opinions I respect talk about with a certain level of admiration. After testing it as thoroughly as I’ve tested any app in a long time, I understand why.

Octarine is a tool for creating, editing, and organizing text-based information using connected but independent documents: Markdown files. Without relying on plugins, it supports images, video, PDFs, and files created by other productivity apps. Those files can be linked inside Octarine but still open in their native applications.

Octarine isn’t designed for a single purpose. It’s more like a flexible Markdown workspace you can adapt to several overlapping uses:

• Journaling
• Task management
• Writing and long-form drafting
• Math or science reference notes
• Documentation
• Personal knowledge management (PKM)
• Project planning

Setup

Octarine is available for Windows, Linux, and macOS, but it’s not a heavy Electron app. The download is just over 30 MB, and it launches as fast as TextEdit; effectively instant.

The interface is tab-based, similar to a web browser. It isn’t strictly native macOS UI, but it’s clean, responsive, and supports customizable themes.

Installation on the Mac is simple:

1. Open the downloaded DMG
2. Drag Octarine.app into /Applications

That’s it.

When you launch it for the first time, Octarine asks you to open or create a Workspace. A workspace is simply a folder of Markdown files; either ones you create or notes that already exist somewhere on your Mac.

Structure

You can download, install, and configure Octarine in well under a minute and immediately start creating documents.

A key design choice is that Octarine uses the filesystem directly. Your workspace is just a folder containing Markdown files with human-readable filenames.

That means:

• You can manage files directly in Finder
• You can open them in any text editor
• Octarine will immediately reflect changes made elsewhere

I verified this by opening a note in Typora, adding a table, and watching it render instantly inside Octarine.

Because everything lives in normal folders and Markdown files, syncing is straightforward. You can use:

• iCloud Drive
• Google Drive
• Syncthing
• GitHub repositories (built-in integration)

The Git support also provides versioning for people who want a real audit trail for their notes.

Like most PKM-oriented tools, Octarine supports wikilinks. Typing [[ opens a searchable list of notes in the workspace. If you bracket a title that doesn’t exist yet, Octarine offers to create the note.

There’s also a knowledge graph showing connections between notes. Just remember: posting screenshots of your graph online costs you several internet credibility points.

Formatting

Most formatting tools are accessible through a slash command menu (/), which exposes a wide range of Markdown and extended elements:

• Headers
• Text styles (bold, italic, strikethrough)
• Callouts
• Code blocks
• Mermaid diagrams
• LaTeX
• Dividers
• Tables
• Colored text
• Dates
• Links
• Templates

You could easily use Octarine purely as a writing tool. It’s a full Markdown editor with live rendering similar to apps like Typora.

Under the hood, however, the file remains a plain text Markdown document. You can open it in BBEdit, import it into Obsidian, or process it with any other Markdown tool.

Octarine also converts pasted HTML into Markdown, preserving elements such as headers, links, bullet lists, and text styles.

Organization

The left sidebar provides a file tree for navigating your workspace. Nested folders work exactly as you’d expect.

When you attach files such as images or PDFs to a note, Octarine automatically creates folders to store them.

Octarine also supports seven types of metadata, which can be used to organize and filter notes.

The most powerful organizational feature is something called Views.

Views are dynamic, database-style tables that display notes based on filters, sorting rules, and custom columns.

Think of them as smart saved searches that update automatically as your notes change.

Tagging is also well implemented. Tags are clickable throughout the interface, and a Tag Manager provides a centralized list of every tag in your workspace.

AI Integration (Pro Version)

Octarine includes optional AI integration.

It works with:

• Local models via Ollama and LM Studio
• Apple Intelligence
• Cloud APIs such as OpenAI, Anthropic, and Google Gemini

AI operates within the context of the current note, allowing it to generate, rewrite, summarize, or refine content.

Like most AI writing workflows, the real learning curve comes from developing reusable prompts that produce consistent results.

Pro users can also download a 90 MB local model that can index an entire workspace to provide additional context-aware features:

• Context indicators

Each message shows the sources used (folders, notes, or date filters). Icons and hover cards reveal the details.

• References

A list shows which notes were consulted to answer your query.

• Export options

Responses can be copied as Markdown or plain text.

• Chat titles

Titles are generated automatically after the first response and can be edited using the Sparkles icon.

• Save the chat

Clicking the Create Note icon in the chat breadcrumb saves the conversation as a note. Your questions become blockquotes, with each Q&A pair separated by a divider.

An Opinion on an Opinionated App

There’s no question that Octarine is powerful.

As someone who has spent years building PKM systems, I can appreciate how much functionality is available without needing plugins or complex setup. Many of the features Octarine includes by default require significant configuration in something like Obsidian.

That simplicity removes a lot of early decisions that intimidate people exploring tools like this.

Octarine is developed by a single developer, which might give some users pause. Personally, it doesn’t worry me much. Some of the most respected Mac utilities come from solo developers, including:

• Keyboard Maestro
• Hazel
• BetterTouchTool
• Rectangle Pro

Looking at Octarine’s update history, development is clearly active and responsive to feedback.

The changelog shows frequent updates, and the roadmap includes plans for:

• iOS and Android versions
• One-click publishing
• Quick capture tools
• Task-management improvements
• Browser extensions

…and quite a bit more.

With the exception of AI features, most of Octarine’s functionality is available in the free version.

The Pro license currently costs $70 (early-bird supporter pricing) and unlocks all current and future features. That isn’t cheap, but it’s roughly in line with other established writing tools like iA Writer ($69) or utilities such as TextSoap ($45).

For users who want a structured Markdown workspace without the plugin rabbit hole, Octarine is definitely worth a serious look.

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