FAQ (Frequently Asked Questions)


Is StarUML open source?

No. StarUML V1 was an open source project under GPL License. However, current StarUML (after V2) is not open source any more. Many users have been expected that the project is being continued, developed and maintained. But, we couldn’t find any sponsors so we can’t avoid to commercialize this product in order to keep developing and supporting users.

Can I still use StarUML V1?

Yes. you can use StarUML V1 for any purpose. However, don't forget that the StarUML V1 is no more maintained and cannot be supported.

Purchased license is perpetual or time limited?

License is perpetual, so you can use forever with the purchased version. However, you need to pay to upgrade to new major versions.

What is the difference between evaluation and purchased license?

In evaluation mode, there will be watermarks in the exported diagram images. There is no time limit for evaluation, but it is only allowed for evaluation purpose. If you want to use for other purposes including educational, personal, or commercial purpose, you need to purchase licenses.

What is the difference between personal license and commercial license?

Commercial licenses are the standard licensing option for companies. They can be used by anyone working for the company. On the contrary, personal license is the licensing option for a private individual purchasing. See more details about licensing options.

Can I use my personal license at work and at home?

Yes, you can. But your license can not be shared with other colleagues.

Can I use my personal license on 2 different machines at the same time?

Yes. you can install on multiple machines owned by you, but it is not allowed to install on other's machines.

Can I use company's commercial license at home?

No. Employees should not use a commercial license at home, unless on a work computer or for work purposes. Commercial license cannot be shared with other companies or individuals.

Why my license key is not working?

First, please check the correct “Name” (License Holder) and “License key” in the license email. Enter the name (your name for personal/educational license, company name for commercial license) used when purchasing for the “Name” field. It’s still not working even If you confirmed the correct name and license key. Please try restarting StarUML or rebooting OS. Most of these problems will be resolved by just restarting or rebooting. If the above trials are failed, you need to deactivate proxy server. You can do this in the settings of Internet Explorer if you are using Windows (See this link).


Can I get a refund?

Refunds are available within 30 days of purchasing. Please send us an email (support@staruml.io) if you wish to claim a refund.

Should I pay to update or upgrade to newer versions?

You can freely update to minor updates (e.g. to 3.x version), but you may need to pay to upgrade to major upgrades (e.g. to V4 version). Upgrade fee will be much cheaper than purchasing new one.

If you have further questions, please contact us.