Penflow is a desktop app that keeps your novel in plain files on your computer. A free account lets you write and export your first novel, with no time limit.
You write. The words land in Markdown files you can open in any editor, back up however you like, and keep long after you stop using Penflow. That is the whole idea.
What good novel writing software should do
After enough years of writing software coming and going, a few things matter more than the feature list:
- Keep your book in files you own. If the app vanished tomorrow, your manuscript should still be sitting there, readable, in a folder you control.
- Save as you write. Autosave and earlier versions help protect your draft.
- Work offline. Writing is not an online activity. The app should run on a plane, in a cabin, with the wifi off.
- Let you choose how to use AI. Write without it, ask for feedback, or review a suggested rewrite. You decide what belongs in your manuscript.
- Cost little. You should be able to write a whole novel without paying a subscription on top of the one you already pay for the internet.
How Penflow handles each
Your novel is a folder of Markdown files on your machine. Scenes, chapters, and your codex of characters and places all live there as plain text. Open them in Obsidian or a text editor any time. Nothing is locked inside Penflow.
Autosave writes changes to disk as you work, and save points give you a history to step back through. There is no save button to forget and no cloud sync to wait on.
Once you have signed in with a free account, writing and export work offline while that sign-in stays saved on your device. Signing out or losing your saved sign-in means reconnecting before using the app again. Your Markdown files remain readable in other editors. AI, online backups and account services need an internet connection.
The optional AI can answer story questions using your manuscript and codex. It also offers proofreading and passage rewrites, including expanding or shortening a selection. You review the suggestions before applying them.
With Supporter and an OpenRouter key, you can also enable automatic story-note checks in Account. In version 0.2.15, these checks are off by default and have a separate switch. They use tokens and propose updates for your review. Requests send relevant book context through Penflow to OpenRouter and a model provider. See how AI requests use your text.
Coming from Scrivener
Scrivener is a deep, capable program, and plenty of writers finish books in it. It also asks a lot up front. There is a learning curve, your work sits inside a Scrivener project rather than plain files, and it is built like a workshop, with a tool for everything.
Penflow is the lighter option. One window, your scenes down the side, your words in the middle. The structure you need and not much else. If Scrivener started to feel like more app than book, this is the calmer place to land. The full Scrivener alternative comparison goes through it point by point.
The same goes for the web tools. They are easy to start and they keep your manuscript on someone else's servers, behind an account, needing a connection. Penflow keeps the book on your computer instead.
How Penflow compares to other writing apps
Choosing a writing app means weighing what each one asks of you. These honest comparisons set Penflow next to the tools writers ask about most, and they are clear about where each one still wins.
vs Scrivener
Scrivener alternative
The deep, capable writing studio that has run on a learning curve for years.
vs Reedsy
Reedsy alternative
A free, browser-based writing and formatting tool tied to a marketplace of editors and designers.
vs Novelcrafter
Novelcrafter alternative
An AI-first cloud writing tool built for fiction, with deep codex and planning tools that help AI co-write your story with you.
vs Atticus
Atticus alternative
An all-in-one writing and book-formatting tool built for self-publishers who want to go from draft to finished file in one place.
vs Ulysses
Ulysses alternative
A beautiful Markdown writing app for Apple devices, made for all kinds of writing.
vs Obsidian
Obsidian alternative
A free, local-first Markdown tool that you can bend into almost anything, including a novel-writing setup.
vs Campfire
Campfire alternative
A modular, browser-based writing and worldbuilding platform built for writers who love building deep fictional worlds.
vs Sudowrite
Sudowrite alternative
The leading AI co-writer for fiction, built to generate and expand prose alongside you.
vs Dabble
Dabble alternative
A clean, friendly cloud writing app with a polished plotting board and sync across every device.
What it costs
A free account includes writing and export for one novel, with no time limit. Supporter costs $4 a month and adds unlimited novels and optional AI tools. OpenRouter bills model usage separately through your own key. The cost depends on the model and how much you use it, including background story-note checks.
New to all this? Start with the guide on how to write a novel.