From first draft
to published book.
The free, all-in-one toolkit for self-published authors — write your manuscript, hit your word count goals, get AI editorial feedback, format a KDP-ready PDF, and design your cover. Every stage of self-publishing, in one workspace.
Free to use · No credit card required · Export to Amazon KDP
End-to-end publishing support
Research
Explore the market, analyze comparable titles, and shape your concept with AI.
Write
Draft your manuscript with daily word count targets and a built-in deadline.
Review
Get a full AI manuscript review and apply every suggested revision in bulk.
Publish
Export a KDP-ready PDF and Kindle EPUB that Amazon accepts on the first upload.
Before. After.
Self-publishing on KDP without the right tools is a project management nightmare. River removes every bottleneck.
- 6 separate tools stitched together
- No plan for how many words to write per day
- $1,500+ for a professional editor
- Fighting InDesign or Vellum for KDP formatting
- A separate cover design tool
- Praying your file passes KDP's requirements
- One workspace, research to published
- AI-calculated daily target to hit your launch date
- Full AI manuscript review with instant revision application
- One-click KDP-ready PDF and Kindle EPUB export
- Professional cover designer built in
- Files Amazon KDP accepts on the first upload
Start with a winning concept.
Write it to your KDP deadline.
Before writing a word, use River’s AI tools to research your genre, analyze comparable titles, and validate your book concept. Once you start drafting, the Writers Dashboard calculates your daily word count target based on your KDP launch date and tracks every session automatically.
- AI research assistantAnalyze your genre, surface comparable titles, and pressure-test your book concept before you write a single chapter.
- KDP launch date plannerSet your KDP publish date and the Dashboard calculates exactly how many words you need each day to get there.
- Daily session trackingEvery writing session is logged automatically, so you always know where you stand against your deadline.
- End-to-end workflow checklistFour built-in phases (Research, Write, Review, Publish) guide you from concept to KDP listing.
She walked into the room. It was very dark and she could not see anything at all as her eyes adjusted.
Editorial-quality review.
Every revision, one click away.
A professional editorial review used to cost $1,500 and take three weeks. The AI Review Tool reads your full draft chapter by chapter, surfaces every prose issue and pacing problem, and gives you a complete rewrite for each one. Apply them individually or hit Apply All. Your manuscript is publisher-ready in minutes, not months.
- Chapter-by-chapter analysisThe AI Review Tool reads your full manuscript and surfaces prose issues, pacing problems, and unclear passages.
- Suggested rewrites includedEvery finding comes with a complete rewrite so you can see the improvement before accepting it.
- Apply revisions in bulkAccept individual suggestions or apply all with one click. No copy-pasting required.
- Full revision historyEvery applied change is tracked with before/after so you can revert anything.
Format for KDP.
Export. Publish.
Getting your file to pass KDP’s requirements used to mean learning InDesign or paying for Vellum. The Book Formatter does it in minutes — adjust your 6×9 layout, typography, margins, and chapter headers in real time, then export files that Amazon KDP accepts on the first upload.
- KDP-ready PDFExport a print-ready 6×9 PDF with your typography, margins, and chapter headers, accepted by Amazon KDP out of the box.
- Kindle EPUBOne-click EPUB export formatted for the Kindle Store and other ebook platforms.
- Cover designerDesign your cover with professional templates, AI generation, or your own artwork.
- Live previewSee exactly how your formatted book looks page by page as you tweak the design.
Everything you need to publish. Free.
Create a Book Project and get the full toolkit — no credit card, no paywall.
Book Toolkit
Research, write, review, format, and publish on Amazon KDP. All in River.
- Book Project — Manage your full manuscript in one place
- Writers Dashboard — Research, goal-setting, daily session tracking
- AI Review Tool — Manuscript review with one-click revisions
- Book Formatter — KDP-ready PDF & Kindle EPUB export
- Cover Designer — Templates, AI generation, or custom uploads
No credit card required · Cancel anytime
Frequently asked questions
- Is the book toolkit really free?
- Yes. Creating a Book Project and using the full toolkit — Writers Dashboard, AI Review Tool, Book Formatter, KDP PDF export, EPUB export, and cover designer — is free for all River users. Sign up, create a Book Project, and start right away.
- How does River help with the research and planning phase?
- River's AI writing tools help you analyze your target genre, identify comparable titles, understand what readers in your category want, and refine your book concept — all before writing a single word of your manuscript.
- How does the AI Review Tool work?
- The AI Review Tool reads your full manuscript chapter by chapter and surfaces prose issues, pacing problems, and unclear passages. Every finding comes with a suggested rewrite so you can see the improvement before accepting it. Apply changes one at a time or use "Apply All" to instantly improve your entire manuscript.
- Does the Book Formatter produce files Amazon KDP will accept?
- Yes. The Book Formatter exports print-ready PDFs sized at 6×9 inches with configurable margins, fonts, and chapter headers that meet Amazon KDP interior specifications. It also exports EPUB files for the Kindle Store. Both formats are generated from the same manuscript so you only need to lay out your book once.
- How do I create a Book Project?
- After signing up, create a Book Project from any space in River. Your manuscript chapters, formatting settings, and cover all live inside the project — export a print-ready PDF or EPUB whenever you're ready.
- Can I write my manuscript inside River?
- Yes. River is a full-featured writing environment with AI assistance, document management, and real-time collaboration. Your manuscript chapters sync automatically into your Book Project for formatting.
Your book won't write itself.
Start today.
Research, writing, AI review, formatting, and export. Every step from blank page to live KDP listing, in one free workspace built for self-published authors.
Create Book Project — FreeFree to use · No credit card required · Export to Amazon KDP