If your are only looking for a simple Add to Calendar Button and are technically experienced, you should check the open source option. It can be used free of charge under its license terms! However, those scripts come with downsides by design. For example, in some cases (device, OS, browser), the dynamic generation of ics files is not supported. Additionally, you need to deal with source code for every change. If you require full stability and ideal compatibility; if you want to edit settings without touching source code; if you want to use an RSVP feature (especially with GDPR-required Double-Opt-In); if this functionality is essential to your business and therefore first-row support has an impact; if you want to share events via links, on Social Media, or via email - you benefit from our managed PRO solution.