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.共享文件：
ShareFile 是 Citrix Systems 提供的文件同步服务、文件共享服务和基于云的文件存储服务。它是一种安全的内容协作，支持以文档为中心的任务。它提供基于云的存储、虚拟数据室和客户门户。它是由Jesse Lipson开发的。它适用于 Windows、macOS、iOS 和 Android。它不提供免费存储空间。它于2005年推出。
Wuala 和 ShareFile 的区别：
| WUALA | SHAREFILE |
|---|---|
| Originally owned by Caleido Incorporation but was later owned by Seagate Technology. | It is owned by Citrix Systems. |
| It was launched in 2008. | It was launched in 2005. |
| It offered 5 GB free storage space but later on it was made only paid-service. | It offers 30 days free trial with maximum storage size 10 GB. |
| It was developed by Dominik Grolimund and Luzius Meisserin. | It was developed by Jesse Lipson. |
| Maximum storage size offered was 2 TB here. | Maximum storage size is unlimited here. |
| It was a file hosting and commercial file synchronization service. | It is a commercial file sharing and file synchronization service. |
| Initially it had referral system but later on referral service was suspended. | It does not provide additional free storage space for referral. |
| This service was suspended in 2015. | It is still in use. |
| It was supported by Windows, OS X, Debian, Ubuntu, iOS and Android. | It is supported by Windows, OS X, Android and iOS. |
| It provided ability to trade local disk storage space against cloud storage. | It does not provide ability to trade local disk storage space. |