Steam keys or the Steam store: what to know before you buy

Many shops sell PC games as "Steam keys", often for less than the Steam store charges. A key is a code. You redeem it in Steam and the game is in your library, the same as if you had bought it there. The differences are in the details: where the key works, who you ask for help, and what happens if you want your money back.
What a key is, and how to use one
A shop that sells keys buys them from publishers or distributors and resells them at its own price. After you pay, it shows you a code. In the Steam client, open the Games menu, choose "Activate a Product on Steam" and enter the code. The game is added to your library and downloads like any other. From then on it is a Steam game, and Steam does not treat it differently when you play, update or install it.
Why a key can be cheaper
A shop's price depends on what it paid, its own margin, its promotions and its currency, not on Steam's list price. That is why the same game can cost noticeably less at one shop than at another and than on Steam. It is also why comparing is worthwhile: the gap is sometimes large and sometimes zero.
Region locks
A key can be restricted to certain countries or regions. Outside them it will not activate, and the shop may not refund it, because it sold what it said it sold. Check the listing for a region note before you buy. SaveSpawn marks rows that say a key will not activate in your region ("Key won't activate in …") and leaves them out of the headline price, but the shop's own listing is the authority, so read it.
Refunds and help
Steam's refund rules apply to games bought in the Steam store. A key bought from another shop is covered by that shop's policy, which is often stricter, and many shops do not refund a key once it has been revealed or activated. If something goes wrong with the key itself, you deal with the shop that sold it, not with Steam. Look for the shop's refund and "invalid key" terms before you rely on it for an expensive game.
Other launchers
Not every key is a Steam key. A listing can be for the Epic Games Store, GOG (whose games are DRM-free installers added to your GOG account), or a publisher's own launcher. Some games bought on Steam also need a publisher account on top of Steam. The listing says which, and it should match what you use.
Reliable shops, and what we compare
The shops on SaveSpawn are established retailers and the stores' own storefronts, not open marketplaces where anyone can list a key. That lowers the risk without removing it: you are still buying from a third party, so the terms above apply.
When to buy on Steam, and when a key is worth it
- Buy on Steam when the price is the same, or within a euro or two, when you want the simplest refund, or when the game is a gift for someone in another region.
- A key can be the better buy when the saving is real, the shop is one you are comfortable with, the key is for your region and your launcher, and you are happy to take the shop's refund terms instead of Steam's.
The five checks for a good deal apply to both, and the comparison on a game page shows the Steam price and every other shop's side by side.