ReaderBull ("we", "us") runs the platform at readerbull.com, which helps self-published authors understand and improve how discoverable their books are on Amazon. This policy covers the ReaderBull website and dashboard. It doesn't cover Amazon itself, or any other site you might reach through a link on ReaderBull.
When you sign up, we collect the email address you sign in with. We use passwordless magic-link sign-in by default, and you can optionally set a password from your dashboard for a faster return login.
You can also sign in with your Google account. If you do, Google shares your name, email address and profile picture with us, so we can create your account and show you as signed in. We don't receive anything else from your Google account, and we never post or act anywhere on your behalf.
When you add a book, you give us an Amazon ASIN or listing URL. We use that to pull the book's public listing data directly from Amazon, including its title, description, star rating, review count, price, cover image, category and bestseller rank. This is the same information any shopper can see on the book's Amazon page.
You can optionally add or edit further details yourself: a description, backend keywords, your own note on monthly sales (kept for your reference only, it doesn't affect your Visibility Score), whether you're currently running Amazon Ads, and the manuscript file itself as a PDF, if you choose to upload one.
If you subscribe to a paid plan, payment is handled by Stripe. You enter your card details on Stripe's own checkout page, so we never see or store your card number. Stripe gives us your subscription status and a customer reference, which is what we use to keep your plan active.
To build your score, competitor list, keyword research and written marketing recommendations, we send some of the information above (your book's title, category, keywords, and similar listing details, never your email address or account details) to a small number of specialist data and AI providers on your behalf: SerpApi (for Amazon listing and search data), DataForSEO (for keyword research), and Anthropic (for the AI-written narrative and keyword classification). None of these providers are permitted to use your data for anything other than fulfilling that specific request.
Some figures on your dashboard, like Sales/mo, are estimates calculated from public data (such as bestseller rank), not real reported sales. We label these clearly wherever they appear.
If you upload your book's PDF, it's stored securely and privately, accessible only to your account. We don't read, analyze, share or use the contents of your manuscript for anything beyond what you've asked ReaderBull to do for you.
If you install the ReaderBull extension and press Import From KDP, the extension opens your KDP Bookshelf to find your book, then reads that book's keywords, categories and description. It only does this when you press the button. It does not read your sales, royalties, bank or tax details, and it never changes anything in your KDP account.
What you import is kept in your own browser, not on ReaderBull's servers. To show how often readers search for your keywords, we send your keywords (not your name or email) to our data partner, which sends back an estimate of monthly searches. We never sell your data.
You can remove the extension at any time from chrome://extensions in Chrome.
Beyond the data providers above, ReaderBull relies on a small number of infrastructure providers to run the service: Supabase (our database and account sign-in provider), Vercel (website hosting), Resend (for sending your sign-in emails), Google (identity checking, only if you choose to sign in with your Google account), Stripe (payments and subscriptions), and PostHog (anonymous product analytics, see below). Each only receives the data it needs to do its job.
We don't sell your data, and we don't share it with anyone for their own marketing purposes.
ReaderBull doesn't use advertising cookies, and doesn't use any cookies for analytics either. Two things are stored in your browser's local storage instead: a small piece of session information that keeps you signed in between visits, and a randomly generated, anonymous ID used by PostHog, the analytics tool we use to understand how visitors use the site (which pages get visited, where people drop off, which features get used) so we can improve the product.
If you are signed out, that analytics ID is not tied to you in any way. If you are signed in, it is linked to your ReaderBull account, so we can see how an individual author uses the product and help them get more out of it. What we store alongside it is an account reference, never your name or your email address. We do not sell it and we do not share it for anyone else's marketing.
We also record a playback of your visit, so we can see where the product is confusing and fix it. Anything you type is hidden from the recording. Recordings are held by PostHog in the EU, are only ever watched by us, and are used to improve ReaderBull and nothing else.
All of this happens only if you accept analytics. If you decline, or change your mind below, nothing is collected and nothing is recorded.
You can turn anonymous analytics on or off at any time. This only affects analytics. The sign-in information stored in your browser is needed for the site to work and stays either way.
Checking your current setting…
We keep your account and book data for as long as your account is active. You can delete an individual book at any time from your dashboard. If you'd like your entire account and all associated data deleted, email hello@readerbull.com and we'll action it directly, we don't yet have a fully self-service deletion flow built.
You can ask us at any time to see what data we hold on you, correct anything inaccurate, or delete your account entirely. Email hello@readerbull.com for any of these and we'll respond as quickly as we can.
ReaderBull is built for authors and publishers, and isn't directed at children. We don't knowingly collect data from anyone under 16.
If this policy changes in a meaningful way, we'll update the date at the top of this page. Worth checking back occasionally if you want to stay current.
Questions about this policy or your data are always welcome at hello@readerbull.com.
readerbull