Competitor price and stock tracking for online stores

Competitor price tracking is the foundation of PriceZag, but price is only half the story. We also monitor stock and product availability across ecommerce websites. You can see who is cheaper, who has run out of stock, how prices have changed, and what those changes mean for your own products.

Instead of opening the same retailer pages every morning, let PriceZag revisit them, collect the information and organize it for you. Use the results to make decisions directly in your dashboard, or put them to work through reports, alerts, automatic repricing and the API.

Prices and stock, side by side

For each product you follow, PriceZag brings its offers from different retailers into one view, alongside your own price. You can compare the lowest and average competitor prices, see where your offer ranks, and check which sellers actually have stock.

Stock is especially useful when making pricing decisions. A retailer offering a very low price may have nothing available to sell. Another may have just restocked. Knowing the difference helps you decide whether to match a price, protect your margin or take advantage of an opening in the market.

• Price: the current selling price detected on each monitored product page, with its original currency recorded.
• Availability: whether a product is in stock or out of stock, when the retailer provides that information.
• Inventory quantity: the number of units available when the website actually reveals a quantity, such as "7 in stock".
• History: how prices and stock readings change over time, shown together in interactive graphs.

Some websites reveal an exact quantity, some say only "In stock", and others provide little usable inventory information. PriceZag keeps those distinctions rather than inventing a stock count. When quantities are available, their fluctuations can also feed our competitor sales estimates - an extra way to spot products that may be selling quickly.

How PriceZag reads prices from ecommerce websites

PriceZag doesn't rely on a retailer sending us its price list. We visit the actual product pages you want to monitor, using real graphical web browsers, and intelligently extract the price, currency and available stock information.

1. You identify the matching product pages. For a product you sell, add the URLs where other stores offer that same item.
2. Our browsers load those pages. This lets PriceZag work with many modern, JavaScript-driven ecommerce sites instead of depending on a simple text download.
3. We interpret and store the results. Our systems evaluate the price they find, retain its original currency, capture available stock information and keep a record for comparisons over time.

PriceZag also assigns confidence to extracted prices, retries pages when a check fails, and provides screenshots of visited pages. The camera icons in your account let you inspect what our browser saw - particularly handy when a retailer changes its layout or an unexpected price appears.

Many retailers use anti-bot protections that make ordinary scraping unreliable. We use a substantial browser and IP infrastructure to handle these challenges. You can read more about that on our Works on protected sites page. No monitoring service can promise that every product page will always be accessible, but getting useful data from difficult sites is a major part of what we build.

When does PriceZag visit each website?

Monitoring is automatic, and visits are scheduled intelligently rather than at fixed times. Standard monitoring is designed around roughly five checks per product URL per day, though actual frequency depends on the plan, the page's history and the conditions of the website.

Our scheduling system pays particular attention to the local business hours of each retailer's market - not PriceZag's business hours in California and not your own time zone. An Australian store and a European store therefore receive their visits at different times of day. Checks are generally concentrated when shoppers in that market are more active.

We also learn from each product's history. Pages whose prices and stock change frequently can receive more attention, while consistently stable pages may be checked less often. Visits are spread smoothly so we are not requesting an entire website's catalog at once. If a website temporarily blocks requests or fails to load, our retry logic adjusts how it is checked.

International price monitoring, without currency headaches

Watching retailers in different countries should not mean manually converting every price. PriceZag automatically detects currencies on the pages it visits and supports 170 currencies. Each observed price is stored in its original currency, so the underlying record stays true to what the retailer displayed.

You can choose an Interface Currency in your account settings and change it whenever you like. PriceZag converts amounts for viewing, graphs and reports using the current exchange rate. Your products can even have different currencies for their own selling prices and costs. Historical converted amounts may therefore move slightly with exchange rates even when the retailer's original price has not changed.

Where we visit from matters too. Some stores display different prices, currencies or availability depending on the visitor's location. PriceZag detects the market associated with each website and selects an appropriate visit location from its browser infrastructure in the United States, Australia or United Kingdom. For websites elsewhere, we use the closest suitable option available. This helps us see the pricing and stock information that the retailer normally presents to shoppers in its market.

If a site has unusual geographic or currency behavior, our team can help adjust how that website is visited.

One set of observations, many ways to use it

Collecting prices is only the beginning. Once price and stock data is in PriceZag, you can use it across the platform instead of maintaining your own spreadsheets and scripts just to keep an eye on the market.

Beyond individual products, the Domains view helps you examine retailers across all the products you monitor from them: average prices, price rankings, availability and trends. You can move between a broad view of a competitor and the history of one particular product.

Start tracking without changing your store

You don't need to migrate your ecommerce store or install a special integration just to track other websites. PriceZag monitors the online product pages you select, regardless of which ecommerce platform you use yourself.

1. Add your products. Import a spreadsheet, connect a supported store or create products directly in your PriceZag account.
2. Add retailer URLs. Associate each product with the pages where competing stores sell that same item.
3. Explore the results. Compare prices and stock, inspect the history graph and set up alerts or reports for the decisions that matter to you.

Start with the products you care about most. The Free Forever plan covers up to 100 monitored URLs, with no credit card required.

Frequently asked questions