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Viscosity Review

Viscosity is an advanced OpenVPN client, developed by SparkLabs, a company based in Australia that also has presence in the United States. The client was originally released in 2008 and it is recognized for its stylish and user-friendly interface that supports a great selection of features that allow you to establish, manage and edit VPN connections with security and reliability. Viscosity is compatible with Windows and Mac, and it allows you to keep your network protected easily. While OpenVPN is a free option, Viscosity requires a paid license. In order to help you find out more about this client, we will review its most important aspects here.

Getting Started

You can go to https://www.sparklabs.com/viscosity/ to purchase a Viscosity license. You can buy a license for macOS (10.9 to 10.13 are supported) for $9 USD and the license for Windows (7, 8, 8.1 and 10) is available for the same price. If you use Windows, as well as Mac, you can purchase a license compatible with both operating systems for just $14. It is also possible to buy multiple licenses at a discounted price. For instance, when you buy more than 5 Mac or Windows licenses, the individual price is reduced to $8, when you purchase more than 10, each license costs $7 and if you buy over 20 licenses, the individual price is $6. Each license includes free updates for all future versions, as well as email support. During the sign up process, you are asked to provide information like your name, last name, company name (if applicable) and email address. Once you complete the payment, your license details will be sent by email. You can pay using credit cards, PayPal and Bitcoin.

Although refunds are only accepted in certain cases and you need to contact the support team to request one, there is a free trial available that lets you test the service for 30 days. Once you buy a license, you can use it for an unlimited amount of time without paying extra fees. It should be noted that when you buy a single license, you can install the VPN client on up to three computers. When you buy two or more licenses of the same platform, you will see that a Serial Type option is displayed. This doesn’t change the amount of computers on which you can use the client, it simply changes the format of the serial number. You can choose between Single Volume Serial or Individual Serials. This is important if you are buying Viscosity for an organization. You can select if you want to use the software on a per-user basis or per-machine, but you can’t have both at the same time. One of the most practical things about Viscosity is that, as previously mentioned, it is possible to get a license that works on both Windows and Mac. There are also guides available that will allow you to set up the software on other platforms such as Linux, manually.

Privacy and Security

In order to make sure that your details remain private, Viscosity uses Windows’ credentials and in the case of Mac, keychain system. Your browser settings are automatically configured to enhance your privacy and anonymity online. Viscosity is designed to help you to keep your information protected from threats like eavesdropping and hacking. Keep in mind that Viscosity only supports OpenVPN so you won’t be able to establish connections using other protocols like L2TP, IPSec or PPTP. The good news is that OpenVPN is the most secure option and both UDP and TCP are supported when you use Viscosity.

In addition, there are many customization options available in the user interface, which gives you more control over the servers and encryption. You can set the encryption for your connection as high as you want, although this depends on the provider you are using. Still, Viscosity allows you to choose encryption ranging from 128-bit Blowfish to 256-bit AES, which provides high grade protection. It is possible to set these options in the commands area, under the Advanced tab and you can also see OpenVPN logs to check the encryption details.

When you use Viscosity, there are no details logged of your connection or session. The website collects information to provide the service and as previously mentioned, your name, email address and other details are required when you sign up. However, you can use an anonymous payment method, choose an anonymous payment method like Bitcoin and take other steps to protect your privacy. Keep in mind that the information logged also depends on the VPN service that you select, so make sure that you check your provider’s privacy policy.

Viscosity and OpenVPN – What are the differences?

OpenVPN is known as a reliable, secure and stable protocol and it is trusted by VPN users thanks to its longevity and good performance. Viscosity offers the advantages of OpenVPN, but it is a more recent option. Viscosity provides advanced features and settings that let you enjoy a better experience with OpenVPN. However, unlike OpenVPN, Viscosity is not open source and it is not available for free.

What about Viscosity and Tunnelblick?

Tunnelblick is a solution aimed at Mac and its capacity is focused on providing the best possible performance with Mac devices. However, Viscosity is more responsive and it allows you to establish connections that are more stable. In addition, Viscosity offers excellent performance with Mac and it gives you the possibility of loading Tunnelblick, as well as OpenVPN files.

Using Viscosity VPN

You can use Viscosity to establish secure connections through an intuitive graphical user interface. It gives you the possibility of using the command line and you can also edit configuration files manually. The service keeps your data secure in pretty much any network environment. Nevertheless, you need to keep in mind that in order to enjoy a secure OpenVPN connection, you need a good VPN provider. There are VPN services like TorGuard, BlackVPN and Le VPN that support Viscosity by default. Once you have selected your VPN provider and after downloading the configuration files for the server you wish to connect to, you will need to setup Viscosity on your own, unless your provider includes it with the service, in which case, you won’t need to get a license.


Viscosity is a practical solution that lets you establish, manage and edit VPN connections. The Graphical User Interface is easy to use and it works smoothly. You can also customize configuration file syntax or command-line. Although there are other options available for free, the advanced customization options and the top customer support make Viscosity a good alternative.