i Have a small application for 20-25 tags but I need to set it up so end user can login or access from anywhere. Ideally from a phone or mobile device, Does VTScada lite support that ? If not, what licenses need to be bought.

Yes, it sounds like VTScadaLIGHT would be a good fit here.

As outlined on the VTScadaLIGHT page (https://www.trihedral.com/free-scada-software) this license includes one concurrent Thin Clint connection that can be accessed remotely from mobile devices.

One caveat is that unlike standard VTScada licenses, VTScadaLIGHT requires a VPN for thin client access outside your network. (We need to do this in order to prevent misuse of our free license.) A VPN is NOT required from within your network on your local WIFI.

As a rule, VPNs are a best practice for any SCADA/HMI application that needs to be accessed remotely.

Let us know how it goes!

You can see our pricing here: https://www.trihedral.com/scada-software-pricing
You can also purchase a 200 tag license from one of our system integrators or, if you are a system integrator yourself, sign up for our Certified Solution Provider program which will allow you to purchase 200 tag licenses for your customers. Please see our Find a Local Integrator page to see system integrators in your area.