Product Tracker: Find Profitable Products

What is a product tracker and why do you need one?

A product tracker is a tool that lets you track and analyze sales data, prices, and trends of products on online marketplaces like bol.com. Whether you're an experienced seller or just starting out with e-commerce, a product tracker gives you the data-driven insights you need to make profitable decisions. Without one, you're navigating a market with millions of products blind - and that's a recipe for failed investments.

In this comprehensive article, we'll explain how a product tracker works, the methods for estimating sales data, how to choose the best tool, and how to use the collected data to maximize your sales. We compare the key product tracker solutions on the market and give you concrete tips to get started right away.

How does a product tracker work?

A product tracker collects and analyzes data about products on marketplaces. The core of every product tracker is estimating sales volumes - how many units of a product are sold per month? This is essential information that marketplaces don't make public. There are two main methods for collecting this data:

The shopping cart method (traditional)

The shopping cart method is the oldest and most used technique. It involves measuring a product's stock at different times by adding items to a shopping cart. The difference in stock over time gives an estimate of the number of units sold. While this method is intuitive, it has serious limitations:

• Waiting time: You have to specify which products you want to track and then wait weeks for usable data
• Stock limit: On bol.com, you can see a maximum of 500 units of stock, making it inaccurate for products with large stocks
• Stock replenishment: If a seller replenishes stock in between, the numbers become unreliable
• Multiple sales channels: If a product is sold through multiple platforms from the same inventory system, bol.com sales are overestimated

Algorithm-based estimation (modern)

Modern product tracker tools use self-developed algorithms that estimate sales data based on multiple data points, such as search volume, reviews, price history, category position, and seasonal patterns. This method provides direct data without waiting time and can also accurately estimate products with large stocks. Boloo's product tracker uses this advanced approach and gives you access to over 2 million products.

Product tracker methods compared

To help you make the right choice, we've put the two main product tracker methods side by side in a comparison:

Criteria	Shopping Cart Method	Algorithm-based
Availability Data	After weeks of waiting	Available immediately
Accuracy	Error-prone with large inventories	Tested on tens of thousands of products
Number of trackable products	Limited to manual selection	2+ million products
Costs	High server costs	Cost-efficient
Inventory >500	Not possible	Possible
Multi-channel sales	Unreliable	Accurate filtering
Replenishment impact	Disrupts measurements	No impact

What data does a product tracker provide?

A good product tracker offers much more than just sales volumes. Below, you'll find the key data points that a professional product tracker should provide:

Sales data and revenue estimates

The most important part of any product tracker is insight into how many units of a product are sold per month, quarter, and year. Linked to the sales price, this provides a revenue estimate. With Boloo's sales dashboard, you can view this data in a clear and concise manner and track trends over time.

Search volumes and search trends

A product tracker also shows how often consumers search for specific terms on bol.com. This helps you understand which product categories are popular and where demand is growing. Seasonal search trends are particularly valuable - they show when demand for specific products peaks, so you can adjust your inventory and marketing accordingly.

Competitor analysis

How many sellers offer the same product? What are their prices? How do they perform in terms of reviews? A product tracker gives you this competitor insight. By assessing market saturation, you can determine if there's room for a new provider or if you should choose a different niche.

Price history and margin calculation

Prices fluctuate constantly on bol.com. A product tracker keeps track of price history, so you can see if a product is structurally profitable or if margins are under pressure due to price competition. Combine this with your own purchase price and shipping costs to calculate your net margin.

How to choose the best product tracker for your situation

There are various product tracker tools on the market, each with their own pros and cons. When choosing the right product tracker, there are several crucial factors to consider:

1. Data availability and coverage

Check how many products the product tracker covers. Some tools track only a few thousand products that you have to select manually, while others - like Boloo - have over 2 million products available directly. The larger the database, the more opportunities you can discover.

2. Data accuracy

Always ask about the accuracy and test results of a product tracker. Reliable tools are tested on tens of thousands of products and can demonstrate that their estimates are within an acceptable margin of error. A product tracker that has a maximum error margin of 25% for 80% of products offers sufficient accuracy for strategic decisions.

3. Ease of use and integration

A product tracker is only useful if you can easily access the data. Look for tools with a Chrome extension that displays data directly on bol.com while you browse the platform. This saves you the hassle of switching between different applications.

4. Price-quality ratio

Product tracker subscriptions vary greatly in price. Algorithm-based tools are generally cheaper to maintain than tools that use the shopping cart method, as they require less server capacity. Compare not only the monthly price, but also what you get back in terms of functionality and data quality.

Practical strategies with a product tracker

Having a product tracker is just the beginning. The real value lies in how you use the data. Here are proven strategies that successful sellers apply:

Niche validation for new products

Before investing in a new product, use the product tracker to validate whether there is sufficient demand. Look for products with consistently high sales but relatively little competition. A product with 500+ monthly sales and fewer than 10 active sellers can be a goldmine.

Seasonal planning

Use the search trend data from your product tracker to identify seasonal patterns. Order your stock well in advance for peak seasons and avoid overstock after seasonal declines. Think of gardening items in the spring, school supplies in August, and toys towards Sinterklaas and Christmas.

Optimizing price strategy

Monitor your competitors' prices via the product tracker and adjust your strategy. If you see that competitors are lowering their prices, you can decide to follow suit or differentiate yourself on quality and service. Read more about bol.com product tracking for detailed pricing strategies.

Expanding your assortment

A product tracker helps you discover related products that sell well. If you sell phone cases, for example, and see that screen protectors in the same category have high sales, you can strategically expand your assortment.

Common mistakes when using a product tracker

Even with the best product tracker, you can make mistakes. These are the most common pitfalls to avoid:

• Only looking at sales volume: A product with high sales but low margins is not necessarily profitable. Always calculate your net margin, including purchase price, shipping costs, bol.com commission, and any return percentages
• Ignoring seasonal trends: A product that sells well in December may show little movement in January. Always look at at least 12 months of data
• Underestimating competition: High sales attract new sellers. Check not only the current number of sellers, but also the growth trend of the number of providers
• Entering too late: If a product has been trending for months, the market may already be saturated when you place your first order. Use your product tracker to spot emerging trends early

Product tracker and the future of e-commerce

The role of a product tracker is becoming increasingly important as e-commerce grows. With the rise of AI and machine learning, product trackers are becoming more accurate in their predictions. Future product trackers will not only display historical data, but also provide predictive analyses - which products will be trending in the coming months?

For sellers on bol.com, now is the time to integrate a product tracker into your workflow. Competition is increasing, margins are getting smaller, and only sellers who make data-driven decisions will be successful in the long run. Start today with Boloo's product tracker and discover which products will be your next bestsellers.

Frequently Asked Questions about Product Trackers

How much does a product tracker cost?

Product tracker subscriptions start at €29 per month for basic functionality. Professional packages with extended data and API access cost between €49 and €149 per month. Check out Boloo's current prices for a full overview.

How accurate is a product tracker?

Accuracy varies by method. Algorithm-based product trackers like Boloo have a maximum error margin of 25% for 80% of products, which is sufficient for strategic decision-making. The shopping cart method can be significantly less accurate for large inventories or multi-channel sales.

Can I try a product tracker for free?

Yes, most product tracker providers offer a free trial period. Boloo offers a free starter plan that allows you to test the basic functionality before committing to a paid subscription.

Which product tracker is best for beginners?

For beginners, a product tracker with an intuitive interface and immediate data availability is crucial. You don't want to wait weeks for data while you're still learning. A tool with a Chrome extension that displays data directly on bol.com makes the learning curve significantly shorter.