Crystal is an addon for iOS games that lets you enter leaderboards, obtain achievements, and… Created by Chillingo Ltd Crystal is an addon for iOS games that lets you enter leaderboards, obtain achievements, and challenge friends and other players over the internet.
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Crystal
Alternatives
| # | Image | App Name | Features | Platforms | Price | Website Link |
| 1 |  |
Plus+ | Android iPhone |
Free | Website | |
| 2 |  |
Scoreoid | Web Discontinued |
Commercial | Website | |
| 3 |  |
Clay.io | Web | Free | Website | |
| 4 |  |
Game Center | Mac iPhone iPad |
Free | Website |