
The category you pick on Amazon is the single biggest lever controlling where your book appears — and Amazon reads your title, subtitle, blurb and keywords to decide whether you really belong there. Get it right and the readers who want exactly your kind of story find you; get it wrong and your book sits on a shelf they never browse.
Run ShelfSmith →ShelfSmith checks your book against thousands of real titles whose Amazon shelves we already know and tells you where it actually lands — the category it reads as before you publish, or the real shelves Amazon gave it once you're live. Then it hands you the exact fixes, ready to copy straight into KDP and emailed to you too.
BISAC is the publishing industry's standard subject code — your book's shelf label. On Amazon you pick a category and Amazon maps it to a BISAC behind the scenes; that code matters directly if you also sell wide through IngramSpark, libraries and other retailers.
No. ShelfSmith works from your blurb (a draft is perfect) or your live Amazon link — no manuscript upload needed.
No. These are recommendations from live market data — a strong, data-backed signal, not a guarantee, and not affiliated with or endorsed by Amazon. You set the category yourself in KDP, free.