For writers waiting on beta readers
AI Beta Reader: See Where Readers Stop
Paste a chapter. Get a reader's report: where they were hooked, where they got lost or skimmed, and the exact line where they'd stop.
Free to start. No card needed.
Theo had been dumped at his own surprise party, which was a first, even for him.
The restaurant had been in the Caruso family for three generations, ever since his great-grandfather came over from Naples with a recipe and a debt.
Ava explained the zoning dispute in detail: the setbacks, the variance, the hearing in March.
- Hooked"Dumped at his own surprise party." Great first line. I'm in.
- Skimming"Three generations." A history lesson while I wait for the party fallout.
What you'll get
A reader's report that names the line where they'd stop
- The line where a reader would stop, and why
- Every spot they got lost or started skimming
- What pulled them forward, quoted from your chapter
Before and after
Your chapter in. A reader's honest reactions out.
The Ninth Bell of Varrow tolled for the Sundering, as it had since the Accord of Ashes, and Keth Varn-Ilsa, last of the Ilsa line, stood in the Hall of Echoes holding the Shardkey of Morrow. Her uncle, the Regent-Who-Waits, had told her the key would choose. It had not chosen. Below, the Grey Assembly argued about the tithe of salt. She thought of Mira. She thought of the river. She thought about leaving, and how the key would follow her if she did.
Lost: "the Sundering, as it had since the Accord of Ashes." Name after name in one sentence, and I don't know whose story this is yet. Hooked: "It had not chosen." The first thing I understand, and I want to know why. I'd stop here: "Below, the Grey Assembly argued about the tithe of salt." The key won't choose her and we cut to a meeting about salt.
No scores and no fixes. Just what reading it felt like.
Why it works
What does an AI beta reader do?
An AI beta reader reads your chapter the way a first reader would and tells you how it felt. River's shows where you hooked them, where they got lost or skimmed, and the exact line where they would have put the book down. It writes all of that up as a reader's report in a doc, with every reaction tied to a quoted line. So you see what your words did on the page, not just what someone thought of them.
A beta reader, in Reedsy's definition, reads a completed or near-completed manuscript to give the writer feedback before publication. Good human betas are hard to find, slow to reply, and sometimes go quiet halfway through without saying why. River's reader finishes every chapter you give it and answers the question every writer wants answered: where did you stop caring? Use it before you send pages out, so your human readers' time goes on what only people can tell you.
It reports; it doesn't fix. You won't get scores, line edits or a rewritten chapter, only a reader's honest account, with one closing line on what they'd change first. For an editor's view of the same chapter, with notes on stakes, the turn and cuts, try the AI book editor. When the report says a reader skimmed, the AI line editor can tighten that passage. And if a reader trips over a fact that changed between chapters, the plot hole finder checks the whole book.
What lands in your doc
What's in your reader's report
- Would I keep reading: yes, maybe or no, with the one line that decided it
- Where I'd stop: the exact line, quoted, with what the reader felt in that moment
- Every reaction in reading order, tagged Hooked, Lost or Skimming, with your line and paragraph
- Lost moments say what the reader thought was happening, so you can compare it with your intent
- What pulled me forward: the lines that hooked the reader, so you protect them in revision
- Questions I'm carrying, plus the one thing the reader would change first, as a direction
How it works
From chapter to reader's report
Paste your chapter
Paste a full chapter, or drop in the file, so the reader can show where it stops.
River reads it
It reads in order, reacting as a first reader would, and quotes every moment it reacts to.
Read your report
Your reader's report lands in a doc you can keep, compare across drafts and ask about.
Revise and rerun
Fix what matters to you, then paste the new draft to see whether the reader keeps going.
What a good beta read tells you
The most useful beta feedback describes an experience, not a repair. As one editor puts it on Reedsy's blog, beta readers are volunteers offering opinions, while developmental editors are paid professionals offering solutions. A reader who says "I got bored here" has handed you something nobody can fake: the moment attention slipped. So River's reader reacts in the first person, in reading order. It tags each moment Hooked, Lost, Skimming or I'd stop here, so the pattern across your chapter is easy to see.
Lost and Skimming are different problems. Lost means the reader couldn't follow: too many names at once, a jump in time, a line that assumes something they don't know yet. Skimming means they followed but stopped caring, often during backstory that arrives before the story has earned it. Each reaction quotes your line with its paragraph number, and the stop line is always named. You can find every spot in your own file and compare what you meant with what landed.
When you want human readers too, swap chapters with other writers. Critique Circle and Scribophile are critique communities that are free to join: you earn credits or points by critiquing other people's work, then spend them to post your own. On r/BetaReaders, you post a short request with your genre and word count. Before anyone reads it, work through the self-editing checklist, so their notes go on the story rather than on slips you could catch yourself.
Questions authors ask
Common questions
What is a beta reader?
A beta reader reads a finished or nearly finished manuscript and tells the author how it felt to read. The Editorial Freelancers Association says beta readers identify errors, plot problems, inconsistencies and unclear sections. Many are volunteers or fellow writers, and the most useful ones say plainly where they lost interest, which is the hardest thing to ask a friend.
How is an AI beta reader different from a human one?
A human reader brings their own taste, history and mood to your book, and an AI reader doesn't. What River's reader does well is finish every chapter you give it, never go quiet on you, and say plainly where it got lost or bored. Treat it as a first pass before human betas, not a replacement for them.
How much do beta readers cost?
Many beta readers are volunteers, often fellow writers swapping chapters, so they cost nothing. Paid beta readers in the EFA's 2026 rate chart report median rates of 0.5¢ to 0.8¢ a word, or about $400 to $640 for an 80,000-word novel. Our guide to the types of editing explains how a beta read differs from an edit. River's beta reader starts free.
Will it tell me how to fix my chapter?
Not in the report, on purpose. A beta reader reports what reading felt like, and the report ends with one line on what the reader would change first. Afterward you can ask River for ideas on the slow spots, still without a rewrite. For notes on stakes, the turn and what to cut, run the chapter through the AI book editor.
Which chapter should I give it?
Start with your opening chapter, because that's where a browsing reader decides whether to buy or put the book back. Next, try the chapter where your human betas went quiet, or where you suspect the middle sags. Give it the whole chapter rather than a few pages, so the reader can tell you where it would stop.
Is it cheating to use AI as a beta reader?
It's your book and your call, and a beta read adds no words to it; it only tells you how the chapter felt to read. If you also swap chapters with human betas, telling them you ran an AI read first is a simple courtesy.
Is my chapter private?
Yes. River reads your chapter or file inside your own River space, not on a public page. It writes the report in a new doc there, and your file stays as it is. River's privacy policy says your documents and drafts are not used to train AI models.
Your next step
More for your book
Find out where your reader stops
Paste a chapter and see the line where a reader would stop, then keep going, one chapter at a time.