Transparency & Rating Guidelines
Welcome to Rezendo.de! Honesty and transparency are the cornerstones of our work. On this page we explain how our rankings are determined and how we handle third-party reviews.
- How We Rate: The Rezendo Score (Ranking Parameters)
Rezendo.de is an aggregator portal. This means: we do not conduct our own physical product tests in a laboratory.
Instead, we analyse the market and evaluate a wide range of publicly available data sources to save you the time-consuming research. Our goal is to create an objective overall picture in the form of the Rezendo Score (1 to 100 points).
Main parameters of our ranking (pursuant to §5b(2) UWG):
When we present products in the form of best-of lists (rankings), the placement and the Rezendo Score consist of the following weighted parameters:
50 % Expert Press & Professional Tests: We summarise the test results and ratings of renowned specialist magazines, industry-specific blogs and established test institutes.
30 % User Feedback: We evaluate the sentiment of thousands of customers who have shared their opinions on major online shops and review portals. We extract the most frequently mentioned strengths (pros) and weaknesses (cons).
20 % Technical Data & Value for Money: We compare manufacturer specifications in relation to the current market price. Products with an above-average high price receive a deduction, while cheaper products receive a bonus, measured against the typical average price in the respective category. In addition, this sub-score improves as a product ages, since the value for money increases as market prices decline. In the first months after market launch, neither an age bonus nor an age deduction applies. This ensures that a brand new product is not prematurely penalised.
Through this methodology we offset the subjective weaknesses of individual tests and provide you with a well-founded meta-analysis.
- Why Some Products and Categories Have No Score
Our score is derived exclusively from existing third-party ratings. Where that basis is missing, we deliberately do not assign a grade. We would rather show no score at all than one resting on too thin a foundation. You will still find these products on our site, with all technical data and whatever sources do exist.
The following reasons occur:
The product is too new. Right after a launch, only first impressions and hands-on articles appear, without a final verdict. As soon as the first full reviews are published, we add them.
There are too few ratings. If a grade rests on a single source, it depends heavily on that publication’s priorities. One unusually harsh or lenient verdict would distort the overall picture. In such cases we wait for further tests.
The product category is generally not covered by consumer magazines. This mainly affects devices that are not bought and installed by the end customer but by a specialist contractor, such as home storage battery modules or rooftop solar panels, for example. Technical laboratory assessments and certificates exist for them, but no graded consumer tests. We still list such categories, because the technical data makes comparison easier.
There are no German-language tests. For imported and niche devices, coverage often does not go beyond spec-sheet portals and automatically generated comparison pages. We do not count such pages as tests.
The available sources contain no rating. Data sheets, price comparison sites and manufacturer product pages are listed as references, but do not feed into the score. A product can therefore have several sources and still no score.
- Information on the Authenticity of Customer Reviews
Since user feedback (see point 1) is an important component of our score, we regularly cite or aggregate customer opinions from external online shops.
Notice pursuant to the Omnibus Directive (§5b(3) UWG):
We do not adopt third-party reviews as our own. Since we only evaluate and summarise customer opinions from the internet, we have no technical means to independently verify whether the authors of these reviews actually purchased or used the relevant products.
We do not verify the authenticity of the customer reviews we aggregate. We rely on the filtering and verification mechanisms of the respective source shops, but cannot guarantee their effectiveness.
- Copyright and Source References
In our meta-reviews we may cite brief excerpts from specialist magazines (right of quotation pursuant to §51 UrhG) in order to substantiate our assessments. We place the greatest importance on the correct attribution of authors. The respective sources and (where available) the exact references can always be found directly next to the quote or in the sources section of the respective article.
- Use of Artificial Intelligence
We use AI as a tool and disclose what for.
Research. AI assists us in finding and evaluating test reports, data sheets and user reviews. Which source enters the score with which rating is something we verify ourselves. The ratings always come from the sources named and never from an AI.
Images. Product-unspecific images such as symbolic images and illustrations are generated with AI. Product photographs are excluded from this.
Language polishing. Our texts are refined linguistically with AI. Content and assessments come from the sources we evaluated.