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.快速分享：
RapidShare 是由 RapidShare AG 提供的文件托管服务、云存储服务和在线备份服务。它有能力同时处理大量用户。它有多种语言版本，如英语、法语、德语和西班牙语。它是由Christian Schmid开发的。它最初被命名为ezShare。它是最早的云存储服务之一。它于2002年推出。
Dropbox 和 RapidShare 的区别：
| DROPBOX | RAPIDSHARE |
|---|---|
| It is owned by Dropbox Incorporation. | It was owned by RapidShare AG. |
| It was launched in 2007. | It was launched in 2002. |
| It was developed by Drew Houston and Arash Ferdowsi. | It was developed by Christian Schmid. |
| It offers 2 GB free storage space and unlimited maximum storage space for paid. | It offered limited storage space for both free and paid accounts. |
| It is a file hosting, file synchronization and cloud storage service. | It was a file hosting and online backup service. |
| Maximum file size is 10 GB and unlimited using client application. | Maximum file size was 500 MB per file. |
| It offers additional 500 MB free storage space for referral up to 18 GB. | It did not have referral system. |
| Files can be downloaded multiple times. | Files could be downloaded only 10 times in free account. |
| Links are not expired after inactivity of some days. | RapidShare links expired after inactivity of 60 days. |
| It is still in use. | This service was suspended in 2015. |
| It shares files through web applications. | While it shared files through links. |
| It uses block-syncing to update changes quickly. | It did not use block-syncing to update changes quickly. |
| It has traffic or band-width limit of 20 GB per day for free and 200 GB per day for paid. | It had variable traffic or band-width limit according to paid plans. |