1. 保管箱：
Dropbox 是美国公司 Dropbox Incorporation 提供的文件托管服务。它提供云存储、文件同步、个人云和客户端软件。它成立于 2007 年。 Dropbox 是由两位麻省理工学院的学生Drew Houston和Arash Ferdowsi 开发的。它仅提供 2 GB 的免费存储空间。它是最早的云存储服务之一。
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。
Dropbox 和 Wuala 的区别：
| DROPBOX | WUALA |
|---|---|
| It is owned by Dropbox Incorporation. | Originally owned by Caleido Incorporation but was later owned by Seagate Technology. |
| It was launched in 2007. | It was launched in 2008. |
| It offers 2 GB free storage space. | It offered 5 GB free storage space but later on it was made only paid-service. |
| It was developed by Drew Houston and Arash Ferdowsi. | It was developed by Dominik Grolimund and Luzius Meisserin. |
| It provides additional 500 MB free storage space for referral up to 18 GB. | 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 here. |
| It partly supports file versioning. | It fully 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 is still in use. | This service was suspended in 2015. |
| It uses block-syncing to update changes quickly. | It did not use block-syncing to update changes quickly. |
| It shares files through web applications. | While it used to share files through links. |