Short answer: Marlowe, from Authors A.I., is a manuscript analysis report — it reads your finished novel, compares it against bestselling fiction, and hands back a diagnosis. It deliberately never rewrites a word. If that report is what you want, Marlowe does it well. You are looking for an alternative if you want the analysis and the edit — the developmental letter, the line edit done in your own voice, and a score you can re-run on the next draft.
Marlowe ingests a full manuscript — Authors A.I. state a 20,000-word minimum, in .docx or ePub — and returns an interactive report through your author dashboard. What it reports on:
Its stated principle is the interesting part: Marlowe gives feedback only and never generates or rewrites text. For authors who want an AI nowhere near their prose, that is a feature, not a limit. Authors A.I. list a single report at $29.95, with Basic and Pro subscriptions for authors running multiple drafts — check their page for current pricing, since plans change.
This is the honest trade, and it is the same trade every analysis-only tool makes:
| Marlowe (Authors A.I.) | Authors Starport | |
|---|---|---|
| Core output | One analysis report on the whole manuscript | A suite: score, developmental critique, line edit, style sheet, scene map |
| Rewrites your prose? | No — by design, never | Yes, if you want it: tracked changes you accept or reject |
| Benchmark | Bestselling novels in your genre | Real reader reviews and reader personas, plus professionally-edited books |
| Genre focus | Fiction generally | Romance specifically |
| Minimum length | 20,000 words (Authors A.I.) | A chapter for the Autopsy; the full book for the Scorecard |
| Free first look | Not offered on the Marlowe page | Reader-Ready Scorecard and First-Chapter Autopsy, both free |
| Price | $29.95 single report; subscriptions listed on their site | See plans |
Prices read off authors.ai on 22 August 2026. We earn nothing from Marlowe and we are not affiliated with Authors A.I.
The cheapest way to compare is to run the free Reader-Ready Scorecard on the same manuscript and read both outputs side by side.
Other tools in this decision: Fictionary alternatives · AutoCrit alternatives · ProWritingAid alternatives · book editing software, by category · what a manuscript evaluation is · what a manuscript report contains · "rate my writing" tools, honestly.
An analysis of the book you wrote cannot tell you whether readers want it. That is the other half, and it is free to read: PlotProse's 2026 Romance Demand Report shows which romance tropes readers are currently asking for and not getting.
Most writing tools give you an AI read of your pages and nothing else. Authors Starport is a full editing suite — developmental critique, a line edit delivered as tracked changes, a style sheet built from your own prose, a scene map and an instant score — and every one of those tools is grounded in what real readers actually respond to. Behind them sit 694,681 hook mentions extracted from real reader reviews, 137,874 book blurbs analysed for hook, stakes and tone, and 4,293 reader personas built from that data. On this site, since June 2026, authors have uploaded 74 manuscripts and run 214 completed critiques and edits plus 40 free Scorecards.
Compared with Marlowe, which benchmarks your manuscript against novels that already sold and then stops at the diagnosis, Starport benchmarks against what real readers say they wanted and did not get — and then does the revision work with you, line by line, in your own voice.
Counted from our own databases on 21 August 2026. We update these figures when we re-count; we don't round them up.
The Reader-Ready Scorecard grades your full manuscript on nine craft metrics, benchmarks it against professionally-edited books, and tells you exactly what to fix first. Free, in minutes.
Get your free Reader-Ready Scorecard →It depends what you want back. If you want another analysis-only report, AutoCrit and Fictionary cover overlapping ground. If you want the analysis plus the actual editing — a developmental letter cited to your chapters and a line edit delivered as tracked changes in your own voice — Authors Starport is built for that, specifically for romance.
Authors A.I. list a single Marlowe report at $29.95, with Basic and Pro subscription plans for authors running several drafts or manuscripts. Prices change, so check the Marlowe page on authors.ai for the current figures rather than trusting any comparison post, including this one.
No, and that is deliberate. Marlowe gives feedback only — it never generates or rewrites text. If you want an AI to stay away from your prose entirely, that rule is the reason to choose it. If you want the edit done as well as diagnosed, you need a tool that does rewriting on purpose.
It works on romance, but it is a general-fiction tool that benchmarks against bestsellers across genres. Romance has expectations readers will not forgive you for missing, and a general benchmark can miss them. A romance-specific tool measures against the beats and the reader reactions that decide whether a romance reader finishes the book.
Yes, for the first look. Authors Starport's Reader-Ready Scorecard grades a full manuscript on nine craft metrics free, and the First-Chapter Autopsy reads your opening 5,000 words free and returns three severity-ranked findings quoted from your own prose. Run one before you pay anyone, including us.