Uncover Your Competitors’ True Inventory
Live checks on every Amazon product page show what’s really available — by seller and by region — plus daily tracking, trends, and Buy Box analysis in your dashboard.
Every check happens right where you shop.
Real-time inventory checks on Amazon
The How Many widget sits right in the buy box. See how many units are available for the offer you’re viewing — then open Amazon’s “Other Sellers” panel and run the same check on every competing offer.
See past seller inventory limits directly on the product page
When a seller caps the quantity you can order, Limit Buster shows the quantity Amazon will actually accept — so competitors can’t hide availability behind purchase limits.
See regional availability & delivery promises
One click opens a US map showing availability across 8 regions, with Amazon’s delivery promise for each. Compare two sellers’ regions and speeds side by side.
Track it once. Watch it every day.
Track products daily for in-depth trend analysis
Add any ASIN to your monitor: price, sales, revenue, sellers, stock level, and rating — updated daily, with weekly averages and one-click report export.
Deconstruct the Buy Box & winning factors
See the ranking factors behind the current Buy Box winner and how your offer compares, factor by factor, on the Buy Box Cheat Sheet.
See what Alexa says about your product.
See how Alexa, Amazon’s AI shopping assistant, describes and recommends products like yours across 25 real shopper questions matched to your product.
- Carousel rank, tracked daily. Where Alexa places your product — 1st through 6th — for each question, and how that position moves day to day.
- Visibility you can measure. The share of shopper questions where Alexa names your brand at all, so you can watch it climb as you improve.
- Who gets named instead. The competing brands ranked ahead of you, question by question — a to-do list for your listing content, not just a report.
One plan for the page. One for the pipeline.
Everything is included from day one. Start on a 14-day free trial, no credit card, and cancel anytime — there are no contracts.
Advanced Inventory Insights
- Unlimited live quantity checks on any Amazon.com listing — buy box and every seller
- Limit Buster — see past seller purchase caps, up to 999 units
- Detailed Geo View — inventory and delivery speed across 8 US regions
- Seller comparison — two sellers side by side, region by region
- 10 monitored ASINs, captured every day
- Trends for price, sales, revenue, stock level, and rating, with weekly averages
- Buy Box ranking factors and the Buy Box Cheat Sheet
- Stock analysis, reviews, alerts, and one-click daily report export
API Plan
- Everything in Advanced Inventory Insights
- Full API access — live checks, Limit Buster, Geo View, and monitoring data
- Bulk monitoring for thousands of ASINs at volume rates
- Premium support through a dedicated Slack channel
- Agencies running many client brands
- Aggregators and enterprise sellers with large catalogs
- Teams feeding inventory data into their own tools
What our users say
Real sellers. Real numbers.
“After three months, we cut our storage fees by 80%…”
After three months of using How Many, we cut our storage fees by 80%. Before, I relied on guesswork and often miscalculated, resulting in high storage costs. How Many was a key piece of the puzzle in achieving these savings!
“How Many is absolutely critical for us to keep our profit margin…”
How Many is crucial for maintaining our profit margins. Previously, I made uninformed purchases, not knowing my competition’s inventory levels. Now, How Many provides insights into potential product demand before buying. It’s invaluable for wholesale arbitrage, allowing me to see behind seller inventory and assess my potential profit. My sister uses it for online arbitrage to check competitor stock and monthly sales, enhancing our decision-making process.
“We save probably 10 hours a week using How Many…”
We save roughly 10 hours a week with How Many, transforming our inventory tracking from a cumbersome chore into efficient, streamlined work. Previously, assessing competitors’ stock felt as impractical as mowing a lawn without a mower. Now, How Many has become indispensable for us, especially in competing for Amazon’s buy box, by significantly reducing the time and effort required for inventory management.
See what your competitors actually have.
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