Best Book Writing Apps in 2025

Writer Assistant (Wassi) is an application created specifically for inventors! We all constantly invent new characters for our stories, be it a comic, a novel, a script, a play, or a game. And so that our characters are alive and riveted the attention, they need to be developed a lot! That is what the Writer Assistant was created for! Plus, with Wassi you can easily outline your stories on the go.

Platforms: Mac, iPhone, iPad

Best for: Outlining, Book, Story, and Free

Website: https://apps.apple.com/app/writer-assistant-wassi/id14686...

Also rated 3.9 ★ on the App Store

Get organized. Stay creative. Milanote is an easy-to-use tool to organize your ideas and projects into visual boards.

Platforms: iPhone, iPad, PC, Windows, Mac, Android, Chrome, Online

Best for: Note-taking, Outlining, Book, Story, Journal, and Free

Website: https://milanote.com/

Also rated 3.0 ★ on PC Magazine

Elevate your writing, create beautiful documents, and collaborate with others—anywhere, anytime.

Platforms: Online, Mac, Windows, iPhone, iPad, Chrome, PC

Best for: Drafting, Essay, Journal, Book, Story, Poetry, and Blog

Website: https://www.microsoft.com/en-us/microsoft-365/word

Also rated 4.5 ★ on TechRadar

The only writing platform with unlimited potential through project management, collaboration, and publishing.

Platforms: Online, Chrome

Best for: Outlining, Drafting, Book, and Story

Website: https://www.squibler.io/

With our writing tools you can track your progress thus far, plan your novel, write your novel and be able to focus on what matters for you the most: FINISHING THE DAMN BOOK!

Platforms: Android

Best for: Outlining, Worldbuilding, Book, Story, and Free

Website: https://play.google.com/store/apps/details?id=net.ajp_gam...

Also rated 4.0 ★ on Google Play

Compose bold, clear, mistake-free writing with Grammarly. Work with an AI writing partner that helps you find the words you need⁠—⁠to write that tricky email, to get your point across, to keep your work moving.

Platforms: Windows, Mac, iPhone, iPad, Android, Chrome, Online, PC

Best for: Editing, Proofreading, Book, Essay, Story, Blog, and Free

Website: https://www.grammarly.com/

Also rated 4.4 ★ on the App Store

Join (probably?) the world's largest writing contest. Flex those creative muscles with weekly writing prompts.

Platforms: Online

Best for: Drafting, Book, Story, and Free

Website: https://blog.reedsy.com/creative-writing-prompts/