When comparing GOG vs IsThereAnyDeal.com, the Slant community recommends IsThereAnyDeal.com for most people. In the question“What are the best sites to find PC game sales?” IsThereAnyDeal.com is ranked 3rd while GOG is ranked 4th. The most important reason people chose IsThereAnyDeal.com is:
Can automatically synchronize with your wishlist on Steam, to notify you about deals for the games you want.
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Pros
Pro DRM free as a rule
GOG refuses digital rights management on principle.
Pro Seasonal sales
gog features summer and winter sales every year and offer quite a lot of games at lower than retail prices.
Pro Client is completely optional
You can either download games directly from the site or use their Steam-like client, GOG Galaxy.
Pro Occasional free games
Every so often, GOG will have a game listed as free to add to your account.
Pro Money back regional pricing
GOG may charge more in some regions as publishers request so. But in those cases they give the extra cash back as credits for buying another game.
For example, the lowest price for the game is U$20 in US, but if in your region it costs U$30 they will give you U$10 back as credits for your next purchase.
Pro Money-back guarantee
If GOG can't help you fix a game, you're free to refund it within a month of purchase.
Pro Excellent support
Support is handled by an in-house team working for the company, and staff are knowledgable about their platform and games.
Pro Good puzzle games
You can find puzzle games like Superliminal and the Myst Series on this website.
Pro Synchronize steam wishlist
Can automatically synchronize with your wishlist on Steam, to notify you about deals for the games you want.
Pro Deal filtering
Deals can be limited to match preferences, such as price points (percentage and dollar amount), Steam redeem codes, and DRM.
Pro Email notifications
Sends accurate email notifications for where you can find deals, and now much you're saving.
Pro Keep track of prices over time and set limits
It's possible to set a price under which you will be notified per game. Also, you can see what the lowest price ever was per store.
Pro It supports a very large amount of stores to compare prices
Not only are there quite a lot of stores they track, but you can also select which stores you are interested in buying from.
Cons
Con Linux games distributed as installation scripts
Installation scripts have a lot of bugs and dependencies. Packing games in archives would be better. Extracting archives from installation scripts is possible, but difficult.
Con Many games only for windows when they also have a native Linux version
The Linux library on Steam is far bigger than in GoG, many titles have its Linux version both in Steam and its respective web page, but GoG only lets buy the Windows version.
Con No Linux client (yet)
They say it's coming. And meanwhile you can still install Linux compatible games directly.
Con Limited, often dated, library selection
Con No compatible support with (Steam) achievements
Steam has achievements that many appreciate. Unfortunately, those same achievements are not available when you buy the GOG version of the same game.
Con No offer details
Con No way to filter reviews
Currently there is no option to filter reviews for a game as it would be easier to see poor reviews on their own over seeing the score mixed altogether.