1.亚马逊S3：
Amazon S3 代表 Amazon Simple Storage Service。它是由 Amazon Web Services 提供的云存储服务。它通过 Web 服务接口提供对象存储。它允许存储任何类型的对象，如用于分析、数据存档、备份和恢复、灾难恢复、混合云存储和互联网应用程序的数据湖。它由 AWS 于 2006 年推出。
2.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。
Amazon S3 和 Wuala 的区别：
| AMAZON S3 | WUALA |
|---|---|
| It is owned by Amazon. | Originally owned by Caleido Incorporation but was later owned by Seagate Technology. |
| It was launched in 2006. | It was launched in 2008. |
| It does not offer 5 GB free storage space. | It offered 5 GB free storage space but later on it was made only paid-service. |
| It was developed by Amazon Web Services (AWS). | It was developed by Dominik Grolimund and Luzius Meisserin. |
| It does not have referral system for gaining additional free storage space. | Initially it had referral system but later on referral service was suspended. |
| It has the unlimited maximum storage size. | Maximum storage size offered was 2 TB. |
| It supports file versioning. | It also supported file versioning. |
| It does not provide ability to trade local disk storage space. | It provided ability to trade local disk storage space against cloud storage. |
| It requires credit-card details for free trial. | It did not require credit-card details for free services. |
| It is still in use. | This service was suspended in 2015. |