BoozDealz Methodology
How Our Deal Score Works
A retailer's advertised discount doesn't automatically make something a great deal. BoozDealz looks at the evidence behind the price and combines several factors to produce a Deal Score out of 100.
The five scoring factors
Historical price advantage
45 pointsA smooth curve rewards prices below the comparable historical median. The bigger the verified advantage, the more points are earned, up to the 45-point allocation.
Approved competitor advantage
25 pointsWe compare against in-stock, approved matches at other retailers, using comparable pack quantities. The saving against the cheapest comparable retailer and the number of retailer prices beaten both contribute.
Recent verified price reduction
15 pointsA verified recent price drop can earn points when daily observations show a reliable transition. These points fade out by expiring seven days after the reduction began; an unobserved price change does not qualify.
Historical price rarity
5 pointsA price that has appeared unusually rarely in sufficiently varied tracked history can earn a small additional reward. A flat or very short history does not qualify.
Availability
10 pointsAn in-stock eligible listing receives availability points.
Historical prices matter
Where enough reliable history is available, BoozDealz uses the product's 90-day median price as its primary historical benchmark. This helps us assess whether today's price is genuinely unusual rather than simply relying on a retailer's claimed saving.
Example
If a bottle normally sells around £40 and is currently £32, that 20% reduction provides useful evidence that the current price is attractive.
Before a score is given
A product must first pass basic eligibility checks. BoozDealz will not present a verified Deal Score where the evidence is not good enough.
- • Out-of-stock products are not eligible.
- • Invalid or suspicious prices are excluded.
- • Uncertain product matches are not automatically merged.
- • Suspicious reference-price behaviour, including extreme differences from historical prices or ambiguous pack sizes, may be excluded or reviewed.
- • Listings failing eligibility checks may receive no Deal Score.
Deal Score and Confidence are different
Deal Score
How attractive is the deal?
The Deal Score measures the overall attractiveness of the opportunity based on the scoring factors above.
Confidence
How strong is the evidence?
Confidence is scored separately out of 100: history length (25 points), price observations (20), retailer coverage (20), approved product matching (10), observation validity (10), current price freshness (5), stock freshness (5) and tracked-day coverage (5). A product with only one retailer and no approved competitor match has less independent evidence, even when its historical price is attractive. High confidence starts at 75, Good at 50 and Limited is below 50.
Confidence levels
- High — strong supporting evidence.
- Good — useful supporting evidence, with some limitations.
- Limited — weaker evidence or shorter history.
- No Score — insufficient evidence to make a reliable assessment.
How scores are used
A high Deal Score does not automatically guarantee that a product will be selected as the Deal of the Day. The product must also pass the eligibility checks, have a suitable confidence level and be in stock.
Deal of the Day selection
The current selection rules require an eligible listing with a Deal Score of at least 80, a confidence level of High or Good, and in-stock availability. If no product meets those requirements, BoozDealz should not manufacture a qualifying deal.
Our approach
We won't pretend that a deal is better than the evidence suggests. We won't rely solely on a retailer's advertised discount. And when we don't have enough information to make a reliable assessment, we'll say so.
BoozDealz is here to help you understand the deal — not make the decision for you.