Get access to advanced features, and keep your data safe in your own network

Host your own WebSequenceDiagrams web site inside your company. Absolutely no configuration required. Just install, and go. You'll get access to advanced features such as states and parallel signals, and images are free of our logo.

Online subscription for one user

Subscribe now for only

Startup edition

Install on PC and serve up to ten simultaneous users*. Great for small teams.

$299

Corporate Edition

Install on one PC, and everyone can access it at once. This is the same version that www.websequencediagrams.com uses.

$899

Worry-free Site License

Install the corporate edition on multiple computers, without any restrictions within your company.

$1999

*A user is tracked using their IP address. Each user automatically reserves a usage slot for 60 minutes from the time of their last access.

Design as fast as you can think

Type out new scenarios as soon as they occur to you in an intuitive language, and our software takes care of making them look polished and professional.

Collaborate and Convince

Paste a link to your designs in an email and your colleagues will be able to see them or improve on them.

Design better with clear explanations

Advanced features let your express your ideas more easily, and annotate your diagrams with extended explanations and automaticallly numbered signals.

Effective security

The downloadable server edition keeps all of your data on your premises, and never makes any outside connections.

Powering innovation everywere

Many of the largest telecommunications and technology companies use WebSequenceDiagrams software in their organizations.

Upgrades & Support

All purchases include free upgrades and support for one year. If you have last purchased more than one year ago, email support@websequencediagrams.com to get a 50% discount on a new, equivalent version.

All purchases include priority e-mail technical support. If you are not satisfied with you purchase, you may request a refund within 30 days. Email support@websequencediagrams.com if you have any questions.

What is a user?

When you purchase the server, you have a license to install it on one computer at a time. The higher priced servers can handle more connections at once. Usage tracking is done in a 60-minute time period. For example, if you have purchased the 10 user version, and ten different people access it, the eleventh person must wait until the first one stops using it for 60 minutes. The server distinguishes people based on their IP address and a browser cookie.

Are there any additional fees?

The software that you install is sold as a perpetual license. Upgrades are free for one year from the date of purchase. You do not have to upgrade to keep using it.

What are the system requirements?

The software runs on Windows or Linux. A complete listing of operating systems is available when you click on the Buy button. The installer includes all necessary components, including a web server. The service will not conflict with existing web servers running on your machine. The web server runs on port 1086, but this can be changed in a configuration file.

For international fonts, you will require the font Arial Unicode. This font is included with Microsoft Office, and it is also available from Microsoft. For the Napkin style, you may also wish to install the FG Virgil font.