Lacuna vs Atticus
Lacuna vs Atticus in 2026: Desktop App vs Browser App
Atticus runs in your browser and stores your files on their servers. Lacuna installs on your computer and keeps everything local. Same EPUB and PDF output. Different design philosophies. Compare them side-by-side.
No credit card required. Full features during trial.
By Corey Jackson, developer of Lacuna
Reviewed by Melissa Erin Jackson, author of 15 self-published books
Updated July 22, 2026 · Read about us
A note about this comparison
Atticus is a solid book formatting tool with a loyal community. It takes a cloud-first approach, while Lacuna takes the opposite: desktop-first, privacy-first, offline-first. Both are one-time purchases. Both produce professional results. This page is here to help you understand the differences so you can choose the right tool for how you work.
Desktop Book Formatting vs. Cloud-Based
Lacuna (Desktop-Native)
- No server outages: runs on your own hardware
- Local saves: no cloud sync between you and your book project
- No syncing issues: no waiting for cloud uploads
- No data stored in the cloud: total manuscript privacy
Atticus (Web-Based)
- Runs anywhere: any browser, any device, plus an installable PWA
- Autosaves to the cloud and syncs across all your devices
- Needs an internet connection for full functionality, including export
- Your manuscript lives on Atticus’s servers rather than your computer
Book Formatting Feature Comparison (2026)
Where the two book formatting tools match, and where they don’t.
| Feature | Lacuna | Atticus |
|---|---|---|
| How it runs | Desktop app (Windows, Mac) | Web app + installable PWA |
| Runs natively on your own computer | ||
| Runs in any web browser / Chromebook | ||
| Works fully offline (including export) | Limited; needs internet | |
| Files stay on your computer | Autosaves to Atticus cloud | |
| Writing + formatting in one app | ||
| Templates and theming | 32 pre-made styles (see features) | Custom theme builder |
| Per-section style overrides | Limited | |
| Image gallery with folders | Limited | |
| Live preview | Multi-device frames | |
| Print-ready PDF (PDF/X-1a) | ||
| EPUB 3 / 2 export | ||
| DOCX export | ||
| Hardcover support | ||
| One-time purchase | $149 | $147 |
| Free trial before you buy | Unlimited, no card | No trial; 30-day refund |
Lacuna saves you money
Smaller ebook files, bigger Amazon royalties
On the 70% royalty option, Amazon’s delivery fee is charged by the megabyte, so a lighter EPUB leaves more in your pocket on every copy you sell.
“I know it’s not really a new thing, but I’ve been moving my manuscripts from Atticus to Lacuna slowly since I bought Lacuna in June. As I’ve been uploading the new Lacuna versions to retailers, I’ve realized that the Lacuna versions are roughly half the size of Atticus versions. Which means the delivery fee Amazon deducts from royalties is decreasing each book I switch over. I’ve made about $10 more in royalties on Amazon this month just because Lacuna exports are smaller than Atticus. At this rate, once I have all my books updated, Lacuna will pay for itself by the end of the year.”
Why our exports come out smaller
- Image compression. Images are resized and recompressed for the screens people read on.
- Lean CSS. The stylesheet carries the rules your book uses, not leftovers repeated in every chapter.
- Font optimization. Embedded fonts are trimmed down to what your book actually needs.
It is quiet work nobody sees, and we have put a lot of hours into it. Every megabyte we shave off is money that stays with you. How much depends on how image-heavy your book is.
Amazon’s delivery cost is $0.15 per MB in the US, on the 70% royalty option. See KDP’s pricing page.
Before you spend a dollar
One of us lets you try the whole thing first.
The other asks you to buy and hope.
Atticus does not offer a free trial. You pay the $147 first and find out afterward how it handles your book, with a 30 day money-back guarantee as the safety net. We think that is backwards.
Lacuna: try it, then decide
- Download free. No credit card, no expiring trial, no clock. Some authors use Lacuna for months before they buy.
- Import your real manuscript and format the whole book, not a demo.
- Every feature is unlocked. Pretty much anything you can do to a book, you can do in Lacuna before you pay a cent.
- Paying is what unlocks final file generation: your EPUB and print PDF.
Atticus: buy first
- No free trial. No way to know if it is the right product for you before you spend the money.
- There is nothing to download and test. The buttons lead to checkout.
- $147 up front, before you know how it handles your manuscript.
- A 30 day money-back guarantee instead, so the clock starts once you have paid.
This is why all sales are final at Lacuna
We stand right next to our software instead of behind a refund window. You get to see all of it first: the features we are proud of and the blemishes we are still sanding down. Nothing is hidden behind a paywall until the moment you export.
So take your time. Bring your hardest book. Poke at it, break it, email us the awkward questions. When you are sure, buy it. Because you can try everything before you pay, we do not offer refunds for a change of mind, and we say so plainly above checkout rather than in the fine print.
Atticus trial and guarantee details from Atticus’s own help center, checked August 2026.
Which One Is Right for You?
Both produce professional ebooks and print books. The honest answer comes down to how you like to work.
Choose Lacuna if…
- You want to try the whole thing on your own book before you spend a dollar
- You want a fast desktop app that works fully offline, export included
- You want your manuscript to stay on your own computer, not a server
- You want to write and format in the same app, with full editors built in
- You want deep design control: 32 pre-made styles plus per-section overrides
- You are on Windows or Mac and want native software, $149 one time
Choose Atticus if…
- You need real-time collaboration, with two people working in the same book at once
- You move between devices and want your book to sync automatically
- You need it to run on Linux or a Chromebook, or straight from a browser
Why Authors Choose Lacuna Over Atticus
No Server Outages
Desktop-native means there is no remote server between you and your book. Your book formatting software works directly with your hardware.
Your Files Stay Local
Your work saves to your own drive, so there is no cloud sync to fail mid-save. Your manuscripts never touch a cloud server.
Works Completely Offline
Format your books without an internet connection. No cloud sync, no accounts, and no data collection. Your manuscripts stay on your computer where they belong.
Two Different Approaches
Atticus and Lacuna are both one-time-purchase book formatting tools that produce professional results. The difference is in how they work. Atticus runs in your browser and stores your data in the cloud. Lacuna runs on your desktop and keeps everything local.
Atticus formats in the cloud.
Lacuna formats on your computer.
If you want a book formatting app that works anywhere you have a browser and an internet connection, Atticus does that well. If you want book formatting software that’s faster, works offline, and keeps your manuscripts private, Lacuna is the better fit.
We built Lacuna for authors who want their tools to feel like real software: fast, reliable, and completely under their control.
Why We Built Lacuna
Lacuna was built by a brother and sister who got tired of the tradeoffs.
Melissa has been writing for over 20 years and has published 15 books. She knows what authors need because she is one. She knows what is missing because she lived it.
Corey has been building software since he was 10 years old. When Melissa told him about her formatting struggles, he knew they could build something better.
No investors. Just a family business building software for authors who deserve better options.
What Authors Are Saying
Real authors. Real books. Formatted with Lacuna.
I’m a cover designer and interior formatter by profession and run my own small publishing press, so trust me when I say I’m picky and my standards are high. InDesign has always been the only program that formats for print with the level of customization I need. For years, I’ve used it for print and another program entirely for ebooks to get the results I wanted. When I saw Lacuna, I immediately went to check it out and within an hour from having downloaded the trial, I was hooked.
This gives me so much more freedom with print options than other formatting programs like Atticus or Vellum while still making ebooks a breeze. The ability to work from one file and have separate print and ebook settings is a complete gamechanger. I’m still learning my way around the program and loving every second.
JJ Carpenter
The Haunting of Kenmore Asylum
I originally checked out Lacuna because somebody in a KDP publishing group I belong to asked if anyone had tried Lacuna out yet. I published nine other books using a different formatter, but I wasn’t happy with it. I ended up taking a look at Lacuna even though I was pretty much sold on Atticus or Vellum. Once I started diving into Lacuna and saw the ease of use and flexibility, I was absolutely floored. It was a no-brainer, and I purchased Lacuna. Since then the program has only improved. Corey is amazing at fixing things and streamlining processes.
If you take a look at the book that I formatted with Lacuna you will see, it would be pretty difficult to do something like that with one of those other formatting programs. Plus they cost more. In my opinion Lacuna is already the best formatter on the market and only getting better. Thanks, Corey and Melissa, for making this available.
NextGen Victory Press
3-Minute Wrestling Devotionals for Rising Athletes
I tried numerous formatting methods and followed endless instructions from publishing websites, but nothing ever turned out right. Since finding Lacuna, everything has changed. I’ve been able to update all my manuscripts effortlessly and give them the professional look they deserve.
Lacuna helped me perfect one of my most cherished stories, The Magic Globe, and finally present it exactly as I envisioned. It’s truly been a game changer for my author journey.
Samuel Graham Astley
The Magic Globe
Try Lacuna Free Today
Download Lacuna and start formatting your first book in minutes. Desktop-native, fully offline, and $149 one time when you’re ready.
After you download:
Want to learn more first? See all features or view pricing.