Quillstone

Quillstone is a research and publishing app for journalists and nonfiction authors working on reporting, biography, narrative history, manuals, textbooks, essays, and other research-led books. It gathers PDFs, documents, notes, and offline references to help build an outline, then offers private AI tools to rewrite, expand, tighten, proofread, or continue prose based on a sample of the writer’s work. Its fact checker adds inline citations and needs-citation markers and produces a verification report. For finished projects, Quillstone can prepare EPUB, PDF, and M4B files, along with covers, metadata, and publishing checklists. It supports local chaptered audiobook creation and layered cover design, with cloud narration and image generation available as options. The Mac app is offline by default, has no analytics or telemetry, and stores project materials and encrypted API keys on the Mac. Selected text is sent to a chosen cloud provider only when enabled. Quillstone requires an Apple Silicon Mac with an M1 or later chip and macOS 15 or newer. The Free plan is free, billed forever; Pro is $89, paid once, billed as a one-time license.

Quillstone brings research, writing, verification, and book-production tools together for nonfiction projects. Its Mac system requirements and the distinction between local and optional cloud features are important to weigh before choosing a plan.

Quillstone suits journalists and nonfiction authors who want research, drafting, fact-checking, and publishing tools in one app. It requires an Apple Silicon Mac running macOS 15 or newer.

Quillstone is a nonfiction book-production app that brings research, drafting, verification, and publishing exports into one Mac workspace. It suits authors who want local-first tools and can work on Apple Silicon; its strict Mac requirements make it a poor fit for writers who need Windows or web access.

Its strongest case is the breadth of its workflow, from organizing source material to preparing EPUB, PDF, and audiobook files. The trade-off is that some cloud capabilities require a paid license and provider costs, while its free plan already covers much of the core toolkit.

Overview

Quillstone is built for research-led nonfiction, including reporting, biography, narrative history, manuals, textbooks, essays, and other evidence-based books. It can collect PDFs, documents, notes, and offline references, then help turn that material into an outline. Continuity tools and book outlining suit long projects better than a simple prose generator.

Its private AI writing tools can rewrite, expand, tighten, proofread, or continue prose using a sample of the writer’s work. That gives authors several kinds of revision support in the same environment, though the available facts do not establish that this replaces a dedicated editor or fact-checking process.

Key features

Research and verification

The research workflow gathers local source materials and helps structure them into an outline. A built-in fact checker adds inline citations and needs-citation markers, then produces a verification report. For nonfiction writers, that pairing can make it easier to spot claims needing support while drafting; citations and markers still call for author review.

Drafting and production

Rewrite controls let writers adjust prose in several ways, and continuity tools support book-length work. Quillstone also prepares EPUB, PDF, and M4B outputs, alongside covers, metadata, and publishing checklists. Local chaptered audiobook creation and layered cover design extend it beyond drafting software. Cloud narration and image generation are optional rather than part of the local workflow.

Privacy and external services

The Mac app is offline by default, with no analytics or telemetry. Manuscripts, outlines, characters, covers, generated images, narration audio, and exports stay on the Mac, and entered API keys are encrypted there. When enabled, selected text goes directly to a chosen cloud provider. The privacy policy names OpenAI and Anthropic for cloud language models and ElevenLabs for narration; it also identifies Brave for web search, OpenAI for online fact-checking, Hugging Face and CivitAI for model downloads, Sparkle for updates, and Lemon Squeezy for license validation. This is a meaningful local-first design, but cloud features necessarily involve external services.

Pricing

Quillstone Free costs nothing, billed forever. It includes all nine writing and editing tools, private AI writing and editing, the fact checker, research and offline retrieval, audiobook creation and voice cloning, cover design, and EPUB/PDF export. That is a substantial starting package for authors who can work within the included capabilities.

Quillstone Pro costs $89, paid once as a one-time license. It includes everything in Free, plus bring-your-own-key cloud editing, cloud narration and image generation, and a publish-ready export bundle, with no markup on provider costs. Pro fits authors who need those cloud options or the fuller export bundle; provider usage costs remain separate. Free gives up those Pro-only cloud features and the publish-ready bundle, but keeps a broad set of local tools.

Platforms

Quillstone is available for iOS and macOS, but its stated system requirements are an Apple Silicon Mac (M1 or later) running macOS 15 or newer. The Mac edition is therefore limited to newer Apple hardware and software; the iOS listing does not change the Mac requirement for the desktop workflow.

Email support is available, and Quillstone says a real person usually responds within two business days.

Who it's for

Choose Quillstone if you are producing serious nonfiction and want research organization, drafting assistance, citation prompts, and book-production outputs in one privacy-conscious Mac app. Its free tier is a sensible place to begin if local tools are enough. Authors who depend on cloud generation, narration, or image creation should weigh Pro’s one-time license against the additional provider costs.

It is not the right choice for writers who lack a compatible Apple Silicon Mac, or whose priority is a browser-based workflow or fiction-focused writing tools.

Pros and cons

• Pros: Research, outlining, revision, fact-checking, cover design, audiobook creation, and EPUB/PDF export are brought together for nonfiction projects.
• Pros: Offline-by-default operation and on-device storage make the local workflow a strong fit for writers who want manuscripts to remain on their Mac.
• Pros: The forever-free plan includes a wide range of writing and production features, rather than limiting the free tier to a short trial.
• Cons: The Mac app requires Apple Silicon and macOS 15 or newer, excluding older Macs and other desktop platforms.
• Cons: Cloud editing, narration, and image generation require Pro and bring separate provider costs, so the license is not the full cost of cloud use.
• Cons: The free plan does not include the publish-ready export bundle or the listed cloud features.

Alternatives

For a wider range of book-writing options, browse AI Book Writing Software.

Jenova Creative Fiction Writer is a better fit for fiction writers who want Android, iOS, or web access. Its Free plan has limited usage, while Plus is $20 a month with 30× Free usage, custom model selection, and no watermarks; Premium is $50 a month.

Automateed may suit ebook creators who prefer Android, iOS, or web access and want a one-time plan: Entry Lifetime is $149, paid once, with 4 eBooks/month, 40 images/month, and 100 tasks/month. Extra credits and website hosting may cost separately.

NovelAI is another option for writers seeking Android, iOS, or web access; it has no free plan, but offers a free trial. Its Paper trial includes 30 image generations, 50 text generations, and 100 text-to-speech generations.

Novelcrafter is worth considering for web and mobile fiction planning: its Scribe plan is $4 a month for unlimited books, series and universes, and basic review features.

Sudowrite may be a better match for people writing fiction for fun or school who want a web-based option; its Hobby & Student plan is $10 a month and includes 225,000 credits per month.

BookBud.ai offers a web-based free starting point with 25,000 signup credits, described as enough to start a book, create a cover, and draft early chapters.

Calliope is a web and API alternative with a free editor and unlimited books; it also offers a €10 credit pack for €10, paid once.

Kosmos is a web-based alternative whose Beta plan is free during beta and requires the user’s own Claude subscription.

Verdict

Quillstone is a strong choice for nonfiction authors who want a broad, local-first book workflow on a current Apple Silicon Mac. Its unusually complete free plan makes it easy to assess the core tools, while Pro adds cloud options and a publish-ready export bundle for a one-time $89 license. Look elsewhere if you need broader desktop compatibility, a browser-first setup, or cloud features without separate provider costs.