Short version. Obsidian is a remarkable notes app that many writers adapt for fiction using plugins and templates. Penflow is purpose-built for novels from the first click: scenes, chapters, and a Codex for your characters and places, no assembly required. Both keep your files as plain Markdown on your computer, so this is less a rivalry and more a question of how much you want to build your own system.
| At a glance | Penflow | Obsidian |
|---|---|---|
| Built for novels | Yes, scenes and chapters and Codex out of the box | No, you build a writing setup with plugins and templates |
| Where your files live | Plain Markdown files on your computer | Plain Markdown files on your computer |
| Price | Free for one novel, $4 a month for unlimited plus AI | Free for personal use; Sync and Publish are paid add-ons |
| Setup to start writing | None, just open the app and create a scene | Needs plugins (like Longform), folder structure, and templates |
| Character and world tracking | Built-in Codex beside your scenes | Manual, via notes, Dataview, or other plugins |
| AI help | Optional reader on your own API key | Possible via plugins, but manual to configure |
| File compatibility | Open your Penflow folder in Obsidian at any time | Open your Obsidian notes in Penflow at any time |
Obsidian has earned its reputation. It is free, stores everything in plain files on your computer, and the plugin community has built tools for almost every use case imaginable. It makes sense that writers reach for it.
The question is whether using Obsidian for novel writing is the right fit for you, or just the path of least resistance.
Why writers try Obsidian for novels
Obsidian’s appeal is real. Your files are plain Markdown on your own disk, not locked in some company’s cloud. You can open them in any text editor, back them up however you like, and keep them forever. For writers who care about owning their work, that matters a lot.
The Longform plugin takes Obsidian closer to a novel app. It adds scenes, chapters, and a compile step so you can assemble your draft into one document. Add Dataview for a character index, a few folder templates, and a daily notes setup, and you have something that resembles a writing environment.
Writers who enjoy building systems genuinely love this approach. If you are comfortable in Obsidian and like the tinkering, it can work.
What Penflow does differently
Penflow starts where that Obsidian setup ends. You open the app and you are looking at an outline of your novel, a place to write scenes, and a Codex where you track characters and places. None of it required configuration.
The core difference is that Obsidian is a notes tool you adapt. Penflow is a novel writing app built around how fiction actually works: a manuscript made of scenes, grouped into chapters, alongside a living reference for your fictional world.
Your files in Penflow are still plain Markdown on your computer, same as Obsidian. The difference is the structure around them. Penflow handles the chapters and scenes and Codex so you can focus on the sentences. If you have ever spent an afternoon reorganizing your Obsidian vault instead of writing, that is the problem Penflow solves.
The AI in Penflow is optional and calm. It reads the scene you are on and can answer questions about your own story. It runs on your own API key, which keeps your manuscript off third-party servers and keeps costs at token rates.
Where Obsidian still wins
This is an honest comparison, so here is what Obsidian genuinely does better.
Obsidian is free. The personal version costs nothing. Penflow has a free plan for one novel, and the full plan is $4 a month, but free is still free.
Obsidian is also more flexible as a thinking tool. If you want your research notes, character sketches, plot diagrams, and daily writing journal all in one place with bidirectional links between them, Obsidian handles that in ways Penflow does not try to. Penflow is a drafting desk, not a second brain.
The plugin ecosystem in Obsidian is enormous. There are kanban boards, graph views, spaced repetition tools, and hundreds of other add-ons. If you already have a system built there and it is working, there is no reason to tear it down.
Moving between them is easy
One thing worth knowing: your Penflow files and your Obsidian files are the same thing. Plain Markdown. You can open your Penflow project folder in Obsidian at any time. You can copy scenes from an Obsidian vault into Penflow. There is no conversion, no export step, no lock-in on either side.
Some writers use Obsidian for research and notes and Penflow for drafting. That is a sensible split. The thinking lives in Obsidian; the manuscript lives in Penflow. The two tools coexist without friction.
If you want more context on why Penflow takes the approach it does, the post on why it was built walks through the thinking.
The honest summary
Obsidian is a great tool used by capable writers. If you already have a novel-writing system there and it is working, keep using it.
If you have been assembling that system for a while and writing less than you planned, Penflow is what you are actually looking for. Same local files, same plain text, minus the setup.
Who each one is for
Choose Penflow if
you want to open a novel app and write, not configure plugins and templates first. You still want plain local files. You would rather have structure ready than design it yourself.
Stay with Obsidian if
you already live in Obsidian, enjoy building your own systems, and want your notes and fiction in one place. With the right plugins and a bit of setup, it can absolutely hold a novel.
Common questions
Can you write a novel in Obsidian?
Yes, people do it. The most common path is installing the Longform plugin, which adds chapter and scene management to Obsidian. From there you set up folders for characters, places, and notes. It works, and some writers love the flexibility. The honest trade-off is that you spend time building and maintaining that system, not just writing. Penflow gives you the same structure without the setup.
Do I need plugins to use Penflow?
No. Penflow ships with scenes, chapters, and a Codex for characters and places already built in. There is nothing to install or configure before you start writing. If you want AI, you add your own OpenRouter key, but that is optional.
Can I switch from Obsidian to Penflow without losing my work?
Yes. Penflow reads plain Markdown files. If your Obsidian vault holds your novel drafts as Markdown, you can open that folder in Penflow or copy your scene files into a Penflow project. The files are the same format. What Penflow adds is the structure around them: an outline sidebar, chapter grouping, and the Codex.
What if I want to keep using Obsidian for notes and research while writing in Penflow?
That is a common and sensible way to work. Many writers use Obsidian as their research and thinking space and Penflow as their drafting desk. Because both read plain Markdown, you can link between them or keep notes in Obsidian while your manuscript lives in Penflow. There is no conflict.
