Based on our record, Steam Spy seems to be a lot more popular than GoCDKeys. While we know about 25 links to Steam Spy, we've tracked only 1 mention of GoCDKeys. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Don’t try to take on giants like Google Shopping or Shopzilla. Instead, find your niche — one that you’re already familiar with — and start small. Examples of smaller niche-centered price comparison websites are Gocdkeys that compares gaming products, Pricechecker which compares UK prices, and Farecompare that compares flight prices. Source: almost 3 years ago
If you still want an estimate you can check on Steam Spy. Source: about 1 year ago
I think Valve will shut it down once it learns about the monetization. AFAIK that is what happened to https://steamspy.com/ when they introduced paid subscription tier. - Source: Hacker News / over 1 year ago
If you still want to see numbers, you can try with Steam Spy with VN available on steam. Most of the developers say that those numbers are false. Source: over 1 year ago
Research popular game genres, for example on https://steamspy.com, and find a genre that currently sells well. Source: almost 2 years ago
Steam Spy - must have tool for anyone who wants to get some data about Steam games. Source: almost 2 years ago
GG.DEALS - Very good and clear site for best deals.
Steam Database - This tool was made to give better insight into the applications that Steam has in its absolutely huge database.
AllKeyShop - Price comparison service for CD keys and game product codes.
Steam Charts - An ongoing analysis of Steam's concurrent players.
IsThereAnyDeal - "When the price is right, you will play all night."
VG Insights - Providing video game industry data, analysis and research. Showing games trends and sales estimates.