1.乌拉：
Wuala 是一种文件同步服务、文件存储服务、文件版本控制服务和备份存储服务，最初由 Caleido Incorporation 提供，但后来归希捷科技所有。它是由Dominik Grolimund和Luzius Meisserin 开发的。它主要是使用Java开发的。它提供了 5 GB 的免费存储空间。它于2008年推出。
2.泽塔：
Zetta 是由 Zetta Incorporation 提供的文件同步服务和基于云的备份存储服务。它由Jeff Whitehead 、 Lou Montulli和Jason Harrison 开发。它主要用于中小型企业和企业。它不提供免费软件版本。它主要用于存储专业数据而不是个人数据。它于2008年推出。
Wuala 和 Zetta 的区别：
| WUALA | ZETTA |
|---|---|
| Originally owned by Caleido Incorporation but was later owned by Seagate Technology. | It is owned by Zetta Incorporation. |
| It was launched in 2008. | It was also launched in 2008. |
| It offered 5 GB free storage space but later on it was made only paid-service. | It does not offer freeware service. |
| It was developed by Dominik Grolimund and Luzius Meisserin. | It was developed by Jeff Whitehead, Lou Montulli and Jason Harrison. |
| It was a file hosting and file synchronization service. | It is a file synchronization service. |
| It provided cloud storage service. | It provides cloud based backup service. |
| It was used by individuals, small and larger enterprises. | It is used by small and medium sized enterprises. |
| It provided storage service for personal data. | It does not provide service for personal data and is used for professional work only. |
| It supported file versioning. | It does not support file versioning. |
| It was supported by Windows, OS X, Debian, Ubuntu, Android and iOS. | It is supported by Windows, OS X and Linux. |
| It had the freeware version. | It does not have the freeware version. |