Terms of Service

Last updated: May 2026

Service Description

Amazon Ranker is a product ranking tool that searches Amazon marketplaces and sorts results using a statistical method called the Wilson score lower bound confidence interval. This algorithm combines star ratings with review volume to produce a composite quality score, giving higher rankings to products that have both strong ratings and a meaningful number of reviews.

The service is provided by Ranker (ranker.elmisi.com) and is not affiliated with, endorsed by, or sponsored by Amazon.

Credits

Searches on Amazon Ranker are paid for with credits. Credits can be purchased through our Stripe-powered checkout. The following terms apply to credits:

• Credits are non-refundable, except when the system automatically refunds a credit for a search that was served entirely from cache (since no API call was made).
• Credits are non-transferable and are tied to the account that purchased them.
• Credits do not expire. They remain in your account until used.

Free Tier

New users who sign in with Google receive 10 free search credits. These credits work exactly like purchased credits and do not expire.

Searches that return cached results (previously fetched by any user) are always free and do not consume credits. Anonymous visitors can browse cached results on the Explore page without signing in.

Price Disclaimer

Product prices displayed in search results are fetched from Amazon at the time of the original search. Prices may change at any time on Amazon, and cached results may show outdated pricing. Always verify the current price on the Amazon product page before making a purchase. Amazon Ranker does not guarantee the accuracy, completeness, or timeliness of any pricing information shown.

Amazon Affiliate Disclosure

Amazon Ranker is a participant in the Amazon Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by linking to Amazon. Product links on this site contain affiliate tags.

When you click a product link and make a purchase on Amazon, we may earn a commission from qualifying purchases. This affiliate relationship does not influence rankings in any way. All products are ranked solely by their composite statistical score, regardless of affiliate status.

Limitation of Liability

Amazon Ranker is provided on an "as is" and "as available" basis, without warranties of any kind, either express or implied.

• Rankings are statistical estimates based on publicly available review data. They are not guarantees of product quality, suitability, or value.
• We are not responsible for any purchase decisions you make based on the rankings or information provided by this service.
• We do not guarantee that the service will be uninterrupted, error-free, or that results will be accurate or complete.
• In no event shall Amazon Ranker or its operators be liable for any indirect, incidental, special, or consequential damages arising from your use of the service.

Contact

If you have questions about these terms, please contact us at questions@ranker.elmisi.com.