Top AI tools for long-form content in 2025
In 2025, artificial intelligence continues to revolutionize how writers approach long-form non-fiction. Whether you're drafting a memoir, penning a groundbreaking piece of investigative journalism, or compiling your next big idea into a book, AI tools are making it easier to plan, write, and refine with precision and efficiency. Below, we’ve highlighted some of the top long-form non-fiction AI tools of the year, including a promising newcomer, Longforma.
1. Sudowrite: Your AI Co-Writer
Initially known as a creative writing assistant, Sudowrite has expanded its capabilities to support non-fiction authors. This tool excels at brainstorming ideas, generating compelling sentences, and providing stylistic suggestions.
For non-fiction writers, Sudowrite is especially helpful when tackling narrative-heavy content, like memoirs or personal essays. It also offers features like tone customization and detailed feedback on pacing and clarity.
2. Jasper AI: The All-Purpose Powerhouse
Jasper remains a go-to AI tool for writers across multiple genres. Its strength lies in its versatility, allowing users to write everything from blogs to full-length books. Jasper’s pre-trained templates include options for non-fiction, such as case studies, how-to guides, and whitepapers.
The tool offers an intuitive workspace, making it easy to experiment with different tones and writing styles. While it doesn’t specialize in long-form non-fiction, its adaptability makes it a strong contender.
3. 1. Longforma: The Gold Standard for Outlining and Refinement
If you're looking for a tool designed specifically for book-length non-fiction, Longforma is a game-changer. It’s built with writers in mind, offering an intuitive interface that allows you to break down your work into sections, chapters, and paragraphs with ease. Unlike most general-purpose AI writing tools, Longforma focuses on helping authors create a structured outline and then drill down into paragraph-level details for iterative refinement.
Key Features:
- Outline generation tailored for long-form projects.
- A "Preview" mode that lets you review your draft in a distraction-free, clean text format.
- Seamless tools for refining text with detailed instructions at both the section and paragraph level.
What sets Longforma apart is its ability to guide writers through the entire creative process—from conceptualizing the structure to perfecting the language—while ensuring their voice remains intact.
4. Scrivener + AI Plugins: The Writer’s Swiss Army Knife
Scrivener has long been a favorite for writers, and now, with AI-powered plugins and integrations, it’s keeping pace with modern technology. These enhancements help writers organize complex ideas and refine their drafts.
The AI integrations allow Scrivener users to improve sentence structure, optimize tone, and even summarize sections to make editing more manageable. While Scrivener's focus remains on organization, the AI plugins add an extra layer of productivity.
5. GrammarlyGO: Beyond Grammar
GrammarlyGO has taken the renowned editing tool to the next level by incorporating AI to assist with long-form writing. It provides writers with suggestions on flow, clarity, and even overall structure.
For non-fiction authors who want to ensure their work is polished and professional, GrammarlyGO’s contextual suggestions are invaluable. It’s not as robust for outlining and ideation as Longforma, but its editing tools are top-notch.
6. ChatGPT: The Generalist Tool for Writers
OpenAI’s ChatGPT is a powerful assistant for brainstorming, drafting, and editing. While it wasn’t designed specifically for long-form non-fiction, its adaptability and broad knowledge base make it a popular choice for writers tackling a variety of topics.
Writers often pair ChatGPT with tools like Scrivener or Longforma to create a complete writing workflow. Its ability to assist with research and idea generation is particularly useful during the early stages of writing.
Why Specialized Tools Like Longforma Are Leading the Pack
In the evolving landscape of AI tools, specialization is becoming key. General-purpose tools like ChatGPT and Jasper are excellent for a range of tasks, but for serious non-fiction writers, tools like Longforma stand out because they address the unique challenges of long-form projects: structuring ideas, refining narratives, and managing large amounts of content.
As AI continues to advance, writers can expect even more targeted solutions for their specific needs. In 2025, the message is clear: whether you’re writing a memoir, a research-heavy exposé, or a business book, the right AI tool can be the partner that helps you cross the finish line.
Are You Ready to Revolutionize Your Writing Process?
With tools like Longforma and others, there’s never been a better time to dive into long-form non-fiction. If you’re ready to elevate your writing game, give these tools a try—and discover just how much AI can enhance your craft.