Quillstone

What Quillstone is

Quillstone is a research, writing, and publishing app for journalists and nonfiction authors, with tools for developing a book from source material through publication-ready outputs. It gathers PDFs, documents, notes, and offline references to help build an outline. Its writing tools can rewrite, expand, tighten, proofread, or continue prose based on a sample of the writer’s work. A fact checker adds inline citations and needs-citation markers, then 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; cloud narration and image generation are optional. The Mac app works offline by default without analytics or telemetry, and selected text is sent to a chosen cloud provider only when enabled. Manuscripts, project materials, generated assets, and exports are stored on the Mac; entered API keys are encrypted there. Quillstone Free costs nothing, billed forever. Quillstone Pro costs $89, paid once as a one-time license. It requires an Apple Silicon Mac with an M1 or later chip and macOS 15 or newer.

Who it suits

Quillstone is designed for serious nonfiction work, including reporting, biography, narrative history, manuals, textbooks, essays, and research-led books. It suits writers who want research, editing, fact-checking, and publishing outputs in one app and can use an Apple Silicon Mac running macOS 15 or newer.

Limits

Quillstone Free is billed forever and includes writing and editing tools, private AI writing and editing, fact checking, research and offline retrieval, audiobook creation and voice cloning, cover design, and EPUB/PDF export. Cloud editing with your own key, cloud narration, image generation, and the publish-ready export bundle are included with Pro, priced at $89, paid once.

Getting started

1. Visit quillstone.io to get started.
2. Use an Apple Silicon Mac with an M1 or later chip running macOS 15 or newer.
3. Choose Quillstone Free, billed forever, or Quillstone Pro at $89, paid once.
4. Enable a cloud provider option only when you want selected text sent for cloud services.

Verdict

Choose Quillstone if you write nonfiction and want research, fact-checking, audiobook creation, and publishing exports alongside drafting tools. Look elsewhere if you do not have a supported Apple Silicon Mac, or if you need cloud narration and image generation without the $89, paid once Pro license.