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Offline-first writing, built for series authors

A series is too big to keep in your head.

And sticky notes weren't built for book six. Verkilo is your continuity manager. It remembers every character, location, and loose thread across the whole series, and hands each one back the moment you need it. One desktop app. One purchase. Yours forever.

Price
$98 once
Trial
30 days, no card
Data
On your computer
Princess of Mars
Verkilo editor with the workspace navigator and section details panels open Verkilo editor with the workspace navigator and section details panels open

A look inside

One window, everything your series needs.

Multi-Book Projects

Keep a whole series in one project — every book side by side.
Verkilo Books library with four books in one series project Verkilo Books library with four books in one series project

Characters

Profiles, a role in every book, every appearance, and shifting relationships — for your whole cast.
Verkilo character tools — profiles, appearances, and relationships Verkilo character tools — profiles, appearances, and relationships

Planning Views

The corkboard and the outliner — your book as cards, or as a sortable table.
Verkilo corkboard and outliner planning views Verkilo corkboard and outliner planning views

Manuscript Reports

Twenty-three reports on the whole book — repetition, rhythm, clarity, structure, consistency — counted on your own machine.
Verkilo Reports overview with a headline number for every report Verkilo Reports overview with a headline number for every report

Writing History

Track your streak, weekly words, and a year of writing at a glance.
Verkilo Writing History with a year heatmap and weekly word counts Verkilo Writing History with a year heatmap and weekly word counts

Story Timeline

Date your scenes in the story's own time, see the whole series four ways, and let Verkilo catch the continuity slips.
Verkilo's Timeline view: the spring of 1886 in The Gods of Mars drawn to scale, one lane per plot thread, with the Threads panel open beside it Verkilo's Timeline view: the spring of 1886 in The Gods of Mars drawn to scale, one lane per plot thread, with the Threads panel open beside it

The promise

If I disappear, your books don't.

Verkilo checks your license exactly once, when you activate it. After that it never asks again — not for a feature, not for a login, not to confirm you're still allowed to open your own manuscript. Pull the network cable out and nothing changes.

Left alone, the only thing it ever asks a server is whether a newer version exists — once, at launch. It sends no license key and nothing about what you're writing; it fetches a version number and that's all. Turn down the update and nothing else happens.

There is one exception, and it's yours to switch on. A line editor can send a section to Anthropic, OpenAI or Google if you paste in your own API key — your key, your bill. That is the only path by which a word of your manuscript leaves this computer, and it does nothing at all until you set it up.

And every build frees itself. About ten years after I compile a release, that copy stops asking for a key at all — no network, no server, nobody's permission. Each new release carries its own date another decade out, so the switch only ever fires on a version I stopped updating. If I'm gone, that happens on its own.

I write military science fiction under two names and I have seven books out. I built this because I needed it. The promise above is the one I would want from someone else's software.

Read my story

Everything you need

Built for authors who think in series, not single books.

Series Bible

Characters, locations, items, and plot threads, tracked across the whole series. When the eye color changes in book three, you catch it before your reader does.

The whole series, one project

Every book in the series sits in one project, sharing the same characters and continuity. Move from book one to book ten without opening another file.

Hit export, get a book

Export to EPUB, PDF, DOCX, HTML, and Markdown with professional typography. Ready for Amazon KDP, IngramSpark, or traditional submission.

Your Data, Your Computer

Your manuscripts live on your computer, not on someone else’s server. Write offline, anywhere, and nothing about your book has to leave the machine.

Just you and the page

Focus Mode clears the sidebars; Composition Mode dims every line but the one you’re writing. Dark mode and an accent color you pick.

Nothing you write is lost

Verkilo snapshots your work as you write. Compare any two versions and restore an earlier draft when you need it.

Why authors choose Verkilo

See how we compare.

Feature Verkilo ScrivenerAtticusDabbleVellum
Series Bible
One-time purchase $128 $59.99/platform$147$699$199.99 / $249.99
No subscription $19/mo
Desktop / local data
Works offline forever
Spelling & grammar BasicSpelling onlyCloud-basedBasic
Pro EPUB/PDF export Basic Word only
Windows, Mac & Linux Win/Mac Mac only
Household license

Competitor prices as of 2 October 2026; features as of 31 July 2026.

Questions & answers

Everything you need to know before you buy.

What platforms does Verkilo support?
Verkilo is available for macOS (both Apple Silicon and Intel Macs), Windows 10/11, and Linux (as both .deb package and AppImage). One purchase covers all platforms.
Is Verkilo a subscription?
No. You buy Verkilo once, and every update to the current release (1.x) is included. Try everything free for 30 days first; when you do buy, one license covers all your personal devices.
Where is my data stored?
Your manuscripts and series data are stored locally on your computer. Verkilo is a desktop app that works completely offline. You own your data — no cloud lock-in, no account required to use the app.
Can I try Verkilo before I buy?
Yes — every download is the full app, free for 30 days. Write real manuscripts, use the Series Bible, and export to EPUB, PDF, and DOCX, all with no credit card, no email, and no account. When the trial ends, Verkilo locks until you buy — nothing is deleted, your projects stay safe on your own disk, and a one-time license picks up exactly where you left off. Buy only once Verkilo has earned a place in your workflow.
What is the Series Bible?
The Series Bible lets you create entries for characters, locations, items, and plot threads that persist across all books in your series. Link entries to scenes, track character appearances, and never lose track of details like eye colors or birthdays.
Does Verkilo check spelling and grammar?
Yes. Verkilo has built-in spelling and grammar checking that runs entirely on your computer. No cloud service, no AI, no account. Right-click to check a section, fix issues from the context menu, and add invented names to your personal dictionary. Character and location names from your project are recognized automatically.
What export formats are supported?
Verkilo exports to EPUB (for ebooks), PDF (for print and proofing), DOCX (for editors and agents), plus HTML and Markdown. All exports use professional typography — proper em-dashes, curly quotes, and widows and orphans handled automatically.
How do I activate my license?
After you buy, Lemon Squeezy (our checkout partner) emails you a license key. In Verkilo choose Help ▸ Activate License… (on a Mac, Verkilo ▸ Activate License…), paste the key, and you’re done. Activation needs an internet connection just that once; from then on Verkilo runs entirely offline. One key covers all the computers in your household. Lost the email? Your key is always available from Lemon Squeezy’s My Orders page.
Does Verkilo use AI?
Nothing is on by default, and nothing happens without your say-so. Spelling and grammar run on your own computer, with no cloud service and no account. Verkilo also has an optional line editor. Pick the sections you want looked at, and it sends them to Anthropic, OpenAI or Google and brings the suggestions back as tracked changes you accept or reject one at a time. It only works once you paste your own API key into Settings, where it stays on your computer — your key and your bill. No key, no connection. That line editor is the only part of Verkilo that can send your writing anywhere, and your manuscript stays a file on your own disk either way.

Founders & Friends

No subscription. No cloud. Yours forever.

Try every feature free for 30 days — no credit card, no account. Buy once when you're sure, and it's yours forever across all your desktops.

$98 $128 once
Claim a founding license

Rather try first? The 30-day trial needs no card and no account.

Direct access to Ben. Questions and bugs answered by a fellow author who builds it.

A voice in what comes next. Make suggestions that polish this into a best-in-class author application.

What's included

  • Full-featured 30-day free trial
  • Every feature included
  • Mac, Windows & Linux
  • Use on all your desktop devices
  • Free updates for version 1.x
  • Your data stays on your computer
  • Export to EPUB, PDF, DOCX, HTML & Markdown
  • Series Bible for character tracking
  • No cloud account or login needed

Founders & Friends is a limited offer. When it ends, the standard $128 license takes its place.

Write your next book in Verkilo.

Every feature free for 30 days. No card, no account. If it earns a place in your workflow, it's $98 once for the first 200 licenses, and yours for good.