From first draft
to finished export.
PetroInk is writing software for people working on something bigger than a quick note. Use it to organize novels, theses, scripts, and other long-form projects with a binder, corkboard, and outliner. Clean up your writing with offline grammar tools, compile your project with simple presets, and export when it’s ready. No subscription. Just one payment. And your work stays on your machine.
macOS, Windows 10/11, and Linux
Everything a serious writer needs
One tool that takes you from planning and drafting through editing and export, without sending a single word to the cloud.
- →Organize long projects. Switch between binder, corkboard, and outliner views. Drag chapters and scenes into order as your manuscript grows.
- →Edit with confidence. Catch passive voice, repetition, and heavy sentences with offline grammar tools. Undo up to 200 steps, including assistant suggestions and formatting.
- →Stay focused. Press F11 for composition mode. A calm, typography-first canvas with live preview keeps the interface out of the way while you write.
- →Compile and export. Finish a chapter or the whole book, then compile with presets or export as DOCX, PDF, Markdown, or EPUB.
- →Offline writing assistant. A private writing companion that runs on your machine. Ask about a scene, outline a chapter, or get rewrite suggestions. Accept or reject changes in the preview before they land in your draft. Nothing leaves your hard drive.
- →Audiobook Studio. Turn chapters into narration with offline standard or premium voices. Preview by chapter, then export MP3 or chapter-ready M4B without sending text to the cloud.
Buy once, write for years
One payment covers everything, forever. No recurring fees, no surprise price hikes, and no features gated behind a higher tier. Pay once and write for years.
Offline by design
After activation, saving, grammar checking, and exporting never touch the internet. Your drafts live on your hard drive, not someone else's server.
Every machine you write on
Native apps for macOS, Windows 10/11, and Linux. One license covers every machine you write on, whether that is your desk at home or the laptop you take on the road.
See your project your way
Switch between binder, corkboard, and outliner views. Press F11 for composition mode when you need a quiet canvas. Live preview and a format toolbar with typography presets keep structure and polish close at hand.
Your writing assistant stays on your machine
Offline grammar tools flag passive voice, repeated words, and heavy sentences on your machine. Undo up to 200 steps, including assistant suggestions and formatting changes. Take named snapshots before a big rewrite. Accept or reject assistant suggestions in the preview pane. Nothing leaves your hard drive.
Export on your terms, no lock-in
Compile with presets and per-chapter control, then export as DOCX, PDF, Markdown, or EPUB. Your work is stored as plain text, so your files stay readable with or without PetroInk.
Bring your story to life
Generate immersive audiobooks with high quality offline narration. Pick a standard or premium voice, preview chapter by chapter, and export when you are ready.
- ✓High quality offline narration
- ✓Chapter-aware narration
- ✓Export ready to publish (MP3 + chapters)
Built to run on the machine you already own
The writing assistant runs entirely on your computer. No cloud uploads, no graphics card required.
How the assistant works
- →Runs on a normal laptop. No graphics card required. A few hundred words of suggestions takes about 15 to 60 seconds on a recent CPU.
- →Stays on your machine. Your manuscript is read from your own disk and replies are generated locally. After activation, nothing is uploaded.
- →Preview before it lands. Every suggestion appears in a preview first. You accept or reject each change before it touches your draft.
- →Light on memory. The assistant uses roughly 4 to 5 GB while active and releases it when you are done. On smaller machines, a lighter, faster assistant keeps things smooth.
System requirements
- ✓Windows 10 or 11 (64-bit), macOS 11 or newer, or Linux (x86-64)
- ✓8 GB RAM recommended (4 GB minimum); 16 GB or more for the largest context
- ✓About 500 MB disk for the app, plus up to ~3 GB for optional assistant and voice packs
- ✓Internet required once to activate and to download optional packs
See everything in one place
Writing, assistant, history, organization, export, and more. All offline, all included.
One payment. Everything above. Lifetime license for macOS, Windows, and Linux.
Own your desk for good
One tool from first draft to finished export. No monthly fees, no features held back, no catches.
PetroInk
One-time payment. Lifetime license. Everything included, nothing held back.
- ✓Binder, corkboard, and outliner for novels, essays, and long reports
- ✓200-step undo, composition mode, named snapshots, and format toolbar
- ✓Offline grammar tools and live preview. No cloud uploads.
- ✓Offline writing assistant with your manuscript as context. Nothing sent to the cloud.
- ✓Compile presets plus export to DOCX, PDF, Markdown, and EPUB
- ✓Audiobook export with premium or standard voices, including chapter-ready M4B
- ✓macOS, Windows 10/11, and Linux with one license
Lifetime license. Fast support if anything goes wrong.