1. 糖同步：
SugarSync 是 J2 Global 提供的云服务和文件同步服务。它可以主动同步计算机系统和其他设备中的文件，以进行备份、访问和共享。它受 Windows、macOS、iOS 和 Android 操作系统支持。它由 J2 Global 于 2009 年推出。它不提供免费存储空间。它为付费用户提供有限和无限的存储空间。
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。
SugarSync 和 Wuala 的区别：
| SUGARSYNC | WUALA |
|---|---|
| It is owned by J2 Global. | Originally owned by Caleido Incorporation but was later owned by Seagate Technology. |
| It was launched in 2009. | It was launched in 2008. |
| It does not offer free storage space. | It offered 5 GB free storage space but later on it was made only paid-service. |
| It was developed by J2 Global. | It was developed by Dominik Grolimund and Luzius Meisserin. |
| It does not provide additional free storage space for referral. | Initially it had referral system but later on referral service was suspended. |
| Maximum storage size is 60 GB for personal paid and unlimited for professional paid. | Maximum storage size offered was 2 TB here. |
| 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 is still in use. | This service was suspended in 2015. |
| Band-width limit is applied to public links only. | Band-width limit is applied to public and private links both. |