# Common questions ### License Key vs API Key To activate the premium features of MindMac, a License Key is required while for interacting with ChatGPT through OpenAI's API, an API Key is needed. In order to utilize the app, an API Key is mandatory while a License Key is solely required for accessing the premium features. ### How does license work? The license is a perpetual license. One license key allows you to use the current app version forever. You are also eligible for one year of free updates. After one year, if you want to get more update versions, you can renew the license for another year with 40% discount of the price you bought it.\ \ If you don't want to renew your license after one year, you can continue to use the last version of MindMac that you have for as long as you want. ### Do I need to pay for ChatGPT Plus to use MindMac? Actually no. MindMac use ChatGPT API which is separate from ChatGPT Plus, so you don't need to subscribe ChatGPT Plus. More about the differences between them can be found [here](https://help.openai.com/en/articles/6950777-what-is-chatgpt-plus). ### Can I get a refund if I don't like it? Certainly. We offer a 14-day money-back guarantee. If you're not happy, let us know within 14 days and we'll issue a full refund with no question asked. ### Does MindMac support Windows/Linux? Currently, MindMac is only compatible with macOS. However, we continuously assess the requirements of our users, and we may explore the possibility of expanding to other platforms such as Windows or Linux in the future. Keep an eye out for any upcoming updates. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.mindmac.app/faqs/common-questions.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.