Yes, it's a self-hosted platform, so you pay a one-time fee and you can download the product. You then have to upload it to a web server (I use a $5/mo DigitalOcean droplet) and use the auto-installer. There is short installation guide here: https://docs.usertrack.net/installation
If your already have a server running the LAMP stack you can add userTrack to it instead of getting a new server, as it's pretty efficient.
I was planning to also add a hosted (SaaS) variant, but if you think about it, it doesn't really make sense: you can just spin up your own DigitalOcean VPS (for cheaper than I would offer it to you) with a few clicks and have userTrack already installed on it. It's better for you for privacy, cost and performance. I am thus trying instead to educate the public more and promote the self-hosting movement, as nowdays it's really easy to run your own services (Docker, cloud-init and image marketplaces make it very easy to setup a server in a few clicks with the software that you need). I see this as the future, where every person can just run one or more virtual servers with the software that they use, instead of paying large monthly fees to big companies for a worse experience, companies that also sell their private data.