Evaluate your OnBuy listing quality against 9 key ranking factors. Get a detailed score on title, images, EAN, dispatch time, and product attributes — with actionable tips to win the Buy Box.
Last updated: March 2026
Good title length — detailed enough for search matching without being excessive.
Only 3 image(s). Add more — OnBuy listings with 4+ photos have higher conversion rates. UK buyers compare against Amazon and eBay image quality.
EAN/barcode provided — required for OnBuy catalog matching and product identification.
Brand specified — essential for OnBuy catalog matching and buyer search.
Color specified — one of the most-filtered attributes on OnBuy.
No size specified. If applicable, add size to improve product matching and reduce returns.
Good description length — provides enough detail for informed purchasing.
2-day dispatch — competitive dispatch time for OnBuy.
Returns accepted — builds buyer confidence and meets UK consumer rights requirements.
OnBuy has grown rapidly in the UK market by offering lower seller fees than Amazon and eBay, attracting both sellers and buyers looking for better value. But lower fees mean higher competition — your listing quality determines whether you win the Buy Box and convert browsers into buyers. This tool checks the factors that matter most for OnBuy success.
Like Amazon, OnBuy uses a Buy Box system where one seller's offer is featured prominently for each product. The Buy Box winner gets the majority of sales. OnBuy's Buy Box algorithm considers three main factors: price (including delivery), dispatch speed, and seller rating. Unlike Amazon, OnBuy doesn't factor in FBA status or advertising spend. This makes it a more level playing field where product quality and competitive pricing determine success.
OnBuy's catalog system matches products by EAN (European Article Number). When you list a product with an EAN, OnBuy checks if that product already exists in the catalog. If it does, your offer is attached to the existing product page alongside other sellers. If it doesn't, you create a new catalog entry. This means product data quality at the catalog level affects every seller offering that product. Ensure your EANs are accurate — an incorrect EAN means your product appears on the wrong catalog page.
UK buyers expect fast delivery. OnBuy prominently displays dispatch time and estimated delivery dates. Sellers offering next-day dispatch have a significant advantage in both Buy Box eligibility and conversion rate. If you can reliably dispatch within 1 business day, enable it — the impact on sales velocity is substantial. OnBuy tracks your actual dispatch performance, so only promise what you can deliver consistently.
While OnBuy's catalog system means multiple sellers share the same product page, the quality of images and description affects overall conversion. If you're creating a new catalog entry, invest in professional product photography and a thorough description. These become permanent fixtures on the product page and affect every seller's conversion rate. UK buyers on OnBuy often research products across marketplaces — your images and description need to match or exceed what they see on Amazon and eBay.
Marqetir's AI creates fully optimized listings for OnBuy, Amazon, eBay, and European marketplaces — titles, descriptions, and attributes, all tailored per platform.