Your data-driven advantage
on the housing market
The smartest bid for only € 69 I/O € 89,-
Use this discount code before the end of March: SLIMBODDB
5,8M+
A prediction based on more than 5,8 million previously sold homes.
1.600+
An AI-driven model based on over 1.600 characteristics of the property.
99,6%
A tested
prediction accuracy
of 99,6%.
Why Smart?
In the fourth quarter of 2025, as much as 72% of homes were sold above the asking price, with an average overbid of 5%. The housing market is therefore fiercer and more competitive than ever.
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SlimBieden gives you the advantage you need. After filling out the form, we collect 1,653 characteristic data points about the property you are interested in. Thanks to this level of detail, we can use machine learning to optimally compare the selected property with more than 5.8 million transactions (approximately 94.5% of all transactions registered at the Kadaster over a period of more than 20 years). The result is an optimal prediction of the winning bid for the property in question.
Bidding with or without an agent
Determining the right offer for a home is complex. In a short amount of time, you need to assess what a property is truly worth, while many relevant factors are difficult to research on your own.
SlimBieden is more than a tool for calculating an offer. It is a reliable second opinion for one of the biggest financial decisions you will make.
Without a buyer’s agent, SlimBieden helps you determine a competitive and well-supported offer. You see which offer price makes sense, where increasing your bid still has an impact, and whether you are at risk of overpaying.
With a buyer’s agent, you combine experience and local market knowledge with data-driven insight. SlimBieden shows how likely it is that a proposed offer will be accepted.
This way, you know where you stand before you place an offer and base your decision not on intuition alone, but on solid, data-backed insight.
Customer reviews:
"Clear, easy to use, and immediate results. Everything you need to base your bid on for your future home."
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Cas - Rotterdam
How does it work?
Step 1
Collecting data
Enter the address of your future home and answer a few questions to start the prediction.
Step 2
Pay
After answering the final question, you will be automatically redirected to the payment via iDeal.
Tip: A lot of information can be found on the website of the selling agent and property marketplaces like Funda.
Step 3
Result
After the payment and a moment of patience for the calculation, you will see the result immediately.
