What's new in CoAuthor

Also in this release

• ImprovedWriting is powered by the newest generation of AI models, with automatic fallbacks across three providers so an outage never interrupts your book.
• ImprovedThe rules against invented statistics, credentials, success stories, and features your book doesn't have now apply everywhere — chapters, introduction, conclusion, author bio, description, and back cover. Your credentials are reproduced exactly as you wrote them.
• NewThe writer keeps a running record of every claim, example, and statistic it has used, so later chapters build on earlier ones instead of repeating them.
• NewThe Finish step scans your book and shows exactly where repetition occurs. Light duplication can be removed automatically; sections that need a real rewrite are flagged by name so you can regenerate them from the Write step.
• NewFact-check reports now list every claim that was checked, what the evidence showed, and a link to the source — for accurate verdicts too, not just problems. Each proposed citation states the exact sentence it supports, and you see the full source list before anything is applied.
• NewConfident-sounding generalizations with nothing behind them (“X always outperforms Y”) are flagged, with softer, honest wording suggested.
• FixedBooks were sometimes ending up with only one or two citations because valid sources were wrongly rejected. Reference lists now fill out the way they should, and duplicate citation markers are cleaned up.
• NewBring your own manuscript: upload a PDF or text file and it's rebuilt with proper structure — chapters and sections mapped correctly, even when the table of contents is messy — with a page-by-page preview of what was imported.
• FixedEmpty, cut-off, or garbled AI output is caught before it can replace text you already have — and simultaneous saves no longer collide, so fast typing or a slow AI response can't wipe your edits.
• FixedRenamed titles stick, subtitles no longer disappear, and renaming a chapter flags its writing directions so the AI writes to your new title, not the old one.
• NewIf your title promises a count (“50 recipes”), the software checks the book actually delivers it.
• FixedBold and italic text now survive into your PDF and Word downloads, and headings can't be silently dropped or duplicated.

Also in this release

• ImprovedOutline and section generation watch themselves: if a step stalls, it retries and resumes from saved progress automatically instead of hanging forever.
• ImprovedTime estimates are computed from your book's actual size — a full outline says “10–15 minutes” when that's the truth, not “2–3”.
• FixedThe author bio uses your name exactly as you gave it — no more invented pen names.
• FixedA brief connection hiccup during generation no longer bounces you back to the book library — the page retries in place and your work stays put.
• FixedText you highlight for inline editing stays selected when you reach for the editing tools.

Also in this release

• NewNotebooks and planners: lined, dot-grid and graph notebooks, sketchbooks, log books, habit trackers, daily, weekly and monthly planners, composition books and guest books.
• NewPuzzle books: word search, sudoku, mazes, word scramble, crossword, cryptogram, trivia and mixed activity books. Give a theme and a difficulty and the puzzles are built for you — answer keys included — so you're never typing in word lists by hand.
• NewGuided books: guided journals, gratitude journals, workbooks and prompted planners, built from a library of page templates you can edit.
• NewColoring books, including a realistic adult line-art style rather than a children's one, up to 100 pages.
• NewChildren's storybooks: your characters stay recognizably the same across every illustration, with full-page edge-to-edge artwork.
• NewOr start from a blank canvas and design every page in the book yourself.
• ImprovedTrim size, paper type and page count follow Amazon's printing rules as you work, so the interior you download uploads cleanly the first time.

Also in this release

• NewA film strip shows every page in your book. Click straight into any of them, and drag pages to reorder them.
• NewA searchable catalog of page templates grouped by category, so you can drill into planners, journals or puzzles rather than scrolling one long list.
• NewType directly on the page and see exactly what will print — no separate edit panel.
• NewTitle, copyright and other structural pages can now be opened and designed too, instead of being fixed.
• NewApply a design, border or decoration to your entire book with one click, or ask AI to fill a page in your book's theme.
• ImprovedPuzzles can be edited page by page — swap words, rewrite clues, recolor, and preview the answer key.

Also in this release

• NewMagic select: click an object in an image and it's recognized and lifted out cleanly — no tracing, no prompt.
• NewLasso anything by hand to grab it or erase it, and the space left behind is filled in for you.
• NewRemove backgrounds, expand an image beyond its original edges, and upscale for print.
• NewEdit part of an image with AI and keep the same character and art style, rather than getting back something unrelated.
• NewUpload your own photos, and every image you generate is kept in a reusable art library you can pull from on any book.
• ImprovedA full-screen editor with a complete undo history, so nothing you try is a one-way door.

Also in this release

• ImprovedThe AI writing engine was upgraded across the board.
• FixedThe AI is no longer permitted to invent statistics, anecdotes, studies or credentials to make a section sound authoritative.
• ImprovedResearch you upload now reaches the writer in far greater depth, and the passages most relevant to the section you're writing are chosen rather than just the opening pages. Where you've provided source material, it is treated as the authority over anything found online.
• FixedSaving your formatting no longer deletes the research you'd uploaded.
• FixedEach source is stored once per book, so your reference list no longer repeats the same citation many times over.
• ImprovedOnly sources that genuinely resolve to a real publication are cited.
• NewChoose how your outline is built: all at once, or step by step so you can edit the chapters and sections before the next stage is generated.
• FixedTyping quickly can no longer cause a save to arrive out of order and cut a section short.
• FixedWhen one AI model hands off to another, the section no longer comes back with the same paragraphs twice.
• ImprovedGenerating the rest of a book shows how many sections are done, how long it's taken and roughly how long is left — and it keeps that progress on screen between sections.

Also in this release

• FixedSections no longer appear twice in the download, and none go missing.
• FixedSubheadings inside a chapter now appear in both the PDF and the Word file, instead of being dropped on the way out.
• FixedThe copyright page fits on a single page.
• FixedThe Word table of contents shows real page numbers in every app — Google Docs, Pages and Preview included, not only Microsoft Word.
• FixedEditing one paragraph in the Write step no longer wipes out the formatting work you'd already done in Format.
• ImprovedFinished exports are delivered rather than quietly failing, and the ornament and section-break settings you choose in Format are respected in the file.

Also in this release

• NewAdvertisement mode for video: built to look native in a social feed, with a TikTok format alongside the existing sizes.
• FixedAd and trailer scripts are no longer cut short, and durations are consistent run to run.
• ImprovedA+ Content now understands whether it's writing about fiction, a children's book or non-fiction, and adjusts accordingly.
• FixedA+ Content stopped inventing book covers, repeating bullets, and adding a stray label line above lists.
• ImprovedChrome extension v1.5.2: sales and rank figures are read from live Amazon search results and checked before they're shown, and royalty numbers are accurate. Update your extension to get this.
• FixedThe support form accepts drag-and-drop and large attachments including video, and every ticket reliably includes your email address so we can reply.

Also in this release

• FixedIn the Format step, changing the font with nothing selected restyles the whole book again. Highlight a passage first and only that passage changes — the two no longer override each other.
• NewInfluencer Review trailers: a new style where an on-camera presenter speaks about your book.
• ImprovedWhen an image generator flags your prompt as sensitive, it retries with a cleaned-up prompt and tells you plainly if it still can't produce the image — instead of failing with nothing you can act on.
• ImprovedIn the cover step, Next walks you through Front, Back, and Full Cover before moving on, so a tab can't be skipped by accident — and a cover image that fails to load offers a retry instead of leaving a blank panel.
• ImprovedOutline generation messages say what is actually happening, and the sub-section summary label reads clearly.

Also in this release

• NewAudible support: best-seller rank, sales, and royalty cards now appear on audible.com — on search results and on the product page, with rank history.
• NewInternational marketplaces: the extension works on amazon.co.uk, .de, .ca, .com.au, .fr, .it, and .es. Rank, price, format, page count, and review data are read correctly in each language, and figures show in the local currency.
• ImprovedSales estimates were recalibrated against real market data — Kindle and Audible especially — and now scale to the size of the marketplace you're browsing instead of applying US numbers everywhere.
• ImprovedRoyalty estimates are calculated from list price, and free books correctly show $0 instead of an invented royalty.
• ImprovedBooks we have no data for now say so, with a short explanation — instead of the card quietly disappearing or showing zeros as though the book sells nothing.
• FixedMy Books opens straight from the extension instead of hanging on a loading screen.

Also in this release

• ImprovedYour trim size is settled before any artwork is generated, so covers are built at your book's real proportions from the first draft instead of being resized to fit afterwards.
• ImprovedBack covers keep Amazon's barcode area clear, and generated artwork no longer paints in a white barcode box or an invented barcode of its own.
• ImprovedHardcover wraps now extend each edge cleanly, so the wrap and flaps no longer show mirrored or made-up artwork along the edges.
• ImprovedSpine text is measured against your book's real spine width before it's placed, so it can't overflow a thin spine.
• New8.25 x 11 is now available as a trim size — it was missing from the hardcover picker.
• FixedThe cover generator returns flat, print-ready artwork instead of occasionally handing back a photo of a book mockup.
• ImprovedIn the Format step, page breaks now appear in both PDF and DOCX, margin presets update the preview as you change them, and the copyright page is a complete localized block with reproduction and content disclaimers.
• FixedDOCX manuscripts open correctly in Apple Pages. Introductions no longer break one paragraph per page, and body text stays justified instead of centered.
• FixedSubsection titles print once, and chapters no longer repeat text they already contain.
• FixedFormatting changes always reach your export, and older Format edits can no longer override newer writing from the Write step.

Also in this release

• NewAngle Finder pulls the most-reviewed books for your keywords, reads their reader reviews, and returns positioning angles as cards: the pattern behind each one, your hook, why it works, and what your book needs to include to deliver on it.
• NewThe Differentiation step inside a book runs the same analysis against the competitive research you've already saved, and the angle you choose carries through the rest of the guided flow.
• NewWrite your own angle instead of choosing one of ours, or regenerate for a fresh set without waiting on the research again.
• ImprovedCompetitor books can be added from any Amazon marketplace, and pricing reads the actual buy-box price rather than an unrelated cheaper offer.
• ImprovedThe fact-checker returns the same verdict for a section you haven't changed, and no longer drops sources on long sections.
• ImprovedWhen you ask the assistant to change your differentiation, it points you to Regenerate ideas instead of offering a change it can't actually make.

Also in this release

• ImprovedSections retry saving on their own if the database is briefly unavailable, and you're warned right away when something didn't save — instead of finding out later.
• FixedReordering your outline can never clear content you've already written.
• ImprovedMerged chapters explain what happened instead of opening an empty editor.
• ImprovedCaptions in vertical (9:16) trailers sit above the Reels and TikTok interface, so they're never covered by the app.
• FixedTrailers retry automatically when a generation step fails, jobs no longer get stuck partway, and journal-style titles no longer produce spiral-bound spines.
• ImprovedBoth balances are now called credits, and each page says what it unlocks: Book Credits write your book, Creative Credits make covers, trailers, ads, and A+ pages.
• ImprovedEvery plan now spells out what it includes, so you know before you subscribe rather than when you first reach for something: writing with AI and the inline AI editing agents come with Professional and above.
• FixedPausing your plan behaves consistently, and changing plans while paused no longer fails.
• ImprovedA+ Content rewrites no longer echo column labels back into comparison rows, and every standalone tool shares one consistent header.

Also in this release

• NewCreative Credits: one unified balance for covers (5), ads (10), trailers (15), and A+ pages (5). Every plan includes a monthly allowance, and unused credits roll into your bank at renewal instead of expiring.
• NewYour separate cover and trailer credits were automatically merged into the unified Creative Credits balance at full value — 1 cover credit became 5 Creative Credits, 1 trailer credit became 15 — so you can generate exactly what you could before. Nothing was lost.
• NewTop up anytime with credit packs, right from the Buy Credits page — bigger packs cost less per credit, and purchased credits never expire.
• ImprovedThe dashboard credits menu shows your full wallet at a glance: monthly usage, banked and purchased balances, and what each creative asset costs.
• ImprovedIf a renewal payment fails, your subscription page now shows a clear “Payment issue” notice with a Fix Payment Method button. Updating your card retries the charge within seconds and shows you the result live — your account unlocks the moment it goes through.
• FixedDownloading a PDF from the Format step could occasionally alter subsection titles in your outline or drop paragraphs. This is fixed, and any affected books repair themselves the next time you open them.

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.