Comp title finder
Paste your book description below. Get five real, published, commercially successful comp titles — with reasons why each fits, plus ready-to-paste copy for your Amazon book description.
See an example of what you'll get
5 comp titles
- The Searcher by Tana French (2020) — Why: rural setting, slow-burn investigation, female outsider protagonist
- The Lost Apothecary by Sarah Penner (2021) — Why: dual timelines, female-driven mystery, atmospheric prose
- Things We Lost to the Water by Eric Nguyen (2021) — Why: literary mystery, family secrets, coastal community
- The Push by Ashley Audrain (2021) — Why: psychological tension, motherhood themes, unreliable narrator
- The Family Upstairs by Lisa Jewell (2019) — Why: dark family secrets, dual timelines, atmospheric tension
Use these in
- Amazon book description: "for readers who loved The Searcher and The Lost Apothecary"
- Amazon Ads: paste author names into the Authors targeting field
- Query letters and back-cover copy
Romance
Fantasy / Sci-Fi
Mystery / Thriller
Literary / Book club
YA / Kidlit
Non-fiction
Your comp titles
More tools.
Authorly is built one carefully-tuned tool at a time. Six live, more on the way:
Amazon book description
Paste your plot, get a structured blurb — hook, setup, stakes, cliffhanger.
KDP keyword expander
One keyword in, ten related ones authors actually search for.
Category recommender
Best Amazon Kindle categories for your book + competition notes.
Trope finder
Identify the tropes in your plot that readers actively search for.
Amazon Ads headlines
Write punchy ad copy from your title and comp titles.
Author bio generator
A few facts in, polished KDP author-page bio out.
Built for indie authors.
Authorly is a small, growing collection of free tools for self-published authors. No accounts. No upload-your-manuscript. No paywalls on the basics. Just tools that work.
Powered by Anthropic's Claude — the AI we found gives the highest-quality output for craft work like this. Five free runs per tool, every day, per visitor — more than enough for most authors. We pay the AI bill so you don't have to. Pro tier with unlimited usage coming soon.
Built by Darren — an indie author who got tired of paying $25–50/month for SaaS tools that mostly just paraphrased synopses. Email is — I read every reply.
Common questions.
Why use this instead of ChatGPT or Claude?
ChatGPT and Claude can do the same work — if you write the right prompt, every time, and check the character counts yourself. Authorly has the prompts tuned and the constraints baked in: KDP keyword phrases char-counted to 50 chars, blurbs structured into hook / setup / stakes / cliffhanger and sized to 130–180 words for Amazon, ad headlines split between Sponsored Products' 150-char and Sponsored Brands' 80-char limits, comp titles cited with reasons each fits.
One click, formatted output, Copy buttons everywhere. I built it because I was tired of re-typing the same setup prompts every book launch.
How is this free?
I pay the AI bill. Each generation costs me about two cents. Five free runs per tool per day per visitor — more than most authors need for a single book launch — keeps it sustainable. The Pro tier ($9/month, unlimited, with batch processing for series authors) is coming soon for people who run dozens of comp lookups per release.
Do you store my plot or my book description?
No. Inputs are sent to the AI, the response is returned to your browser, and nothing is saved server-side except an anonymized rate-limit counter that's auto-deleted after 48 hours. Full details on the Privacy page.
Why no signup?
Because the moment a tool asks for an email, it stops being a tool and starts being a marketing funnel. Authorly works the way Google works: open the page, get the answer, leave. (If you want updates on the Pro tier, the waitlist below is opt-in.)
Get notified when it launches.
Unlimited runs, priority models, save and revisit your past results. We'll email once — when it's ready.