What's new in CoAuthor

Also in this release

• NewLive collaboration: co-authors can edit the same book at the same time, with presence avatars showing who's working where.
• NewSection version history — every section keeps snapshots you can browse and restore with one click.
• NewBuy book credits directly from your dashboard, with clearer plan and billing management.
• ImprovedAI generation is now backed by multiple model providers, so a single provider outage no longer interrupts your writing, covers, or A+ content.
• FixedFact-checker results are now consistent between runs and no longer fail with parsing errors on long sections.

Also in this release

• ImprovedThe generator always writes copy for the book you selected, and the review step now shows exactly which book the copy was written for.
• Improved“Rewrite copy” fills your empty checklist items instead of deleting them, and rewrites every unlocked field — including comparison tables and step labels.
• ImprovedThe Toolkit module now showcases objects that actually belong to your book's topic.
• FixedBanner text no longer gets cut off at the edges of generated module images.
• Fixed“New project” clearly starts a fresh project, and drafts autosave reliably as you work.

Also in this release

• NewPick your trim size at the start of the cover generator so artwork is created at the right proportions from the first draft.
• NewBack cover designer: AI-written blurbs with four professional layouts, author photo support, and barcode-safe zones.
• ImprovedHardcover wraps now match KDP's case-laminate specs exactly — spine width, board wrap, and bleed are calculated from your page count and paper type.
• ImprovedeBook covers export as Kindle-ready JPEGs at the ideal 1.6:1 ratio, filling the screen with no black bars.
• FixedCovers no longer get cropped when switching trim sizes, and exported wraps have crisp, print-safe edges.

Also in this release

• NewApply assistant suggestions to your title, subtitle, description, USP, author persona, beliefs, and bio with one click — and revert just as easily.
• NewCover & title judge: an AI review step that scores your cover concepts and recommends stronger titles for your exact audience.
• ImprovedThe assistant tells you when something can't be applied automatically and points you to the right step instead of failing silently.
• FixedAuthor persona generation works with just an author name or description — the optional fields are truly optional now.

Also in this release

• NewStandalone generators for covers, A+ content, author bios, outlines, titles, and personas — no full book project required.
• NewBook trailer studio: turn your book into a short promotional video with AI-generated scripts and scenes.
• NewFact-checker for non-fiction sections with source-grounded corrections.
• ImprovedManuscript exports include image-only sections and cleaner KDP-ready PDF and DOCX formatting.

Also in this release

• NewNiche Hunter: browse real Amazon sales data, best-seller rank trends, and royalty estimates to validate your book idea before writing a word.
• NewChrome extension that analyzes any Amazon book page while you browse.
• NewDifferentiation step: pick the angle that sets your book apart, backed by analysis of competing titles.
• ImprovedCover generator now creates three variants per generation with bestseller-quality prompts, and the gallery highlights your selected cover.
• ImprovedFaster, more reliable generation across the app with major database and timeout fixes.

Also in this release

• NewTranslate your entire book into other languages with real-time progress, localized exports, and in-app preview.
• NewCitations with real Google Search grounding — sources link to actual DOIs and publications, collected in a References section.
• NewCredit-based AI generation with an Essentials tier, in-app credit purchases, and 10 book covers included per book credit.
• NewIn-depth tutorial page with guides for every feature.
• ImprovedKDP-compliant PDF and DOCX exports: navigable table of contents, proper page breaks, font choices that carry through, and reliable exports for large image-heavy books.

Also in this release

• NewFormat & Publish step: a three-panel book formatting studio to style chapters, fonts, and layout before export.
• NewSimple vs. Advanced creation modes — a streamlined path for first-time authors, full control for pros.
• NewResize and reposition images inside your manuscript, with sizing preserved in PDF exports.
• NewRecently Deleted: recover books you removed by mistake.
• ImprovedGenre-aware cover styling tailors typography and imagery to your book's category.

Also in this release

• NewAuthor Persona: create a writing persona from your name, description, or writing samples, and let it shape your book's voice.
• NewAI assistant available on every page of the app.
• NewStandalone Title Generator and Cover Generator — craft titles and covers without starting a full book project.
• NewResources step: add your own research, links, and notes that the AI weaves into your proposal.
• ImprovedWriting agents follow word-count guidelines and outline structure more faithfully, with automatic retries across models.