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Looking for alternatives to Virtualizor (for production use)
We’re evaluating alternatives to Virtualizor for our virtualization platform.
Main requirements:
KVM support
Reliable backup system
API access
WHMCS or billing integration
Would like to know what other providers here are currently using in production — VirtFusion, Proxmox, SolusVM2, or something else?
Appreciate any feedback on stability and support quality.

Comments
Build on a panel on top of Proxmox, works great.
Virtfusion all the way, it works great.
Or if you have the resources, build custom based on Libvirt or proxmox
+1 for VirtFusion!
Nothing else comes close!
We use Virtfusion and Virtualizor - Virtfusion may be complete, but Virtualizor is much better in terms of support and customer service
Control panel looks modern, can we customize it ?
how long did it take you to build it, and what kind of resources or team did you need for it?
Take a look into ISPsystem products (https://www.ispsystem.com/). Be ready to unrelated claims from various ukranian trolls but it is only real and serious software which work as expected.
Technically Proxmox does have a WebUI already, with all those features you require and an API etc too. WHMCS modules exist too for it.
Apart from Proxmox, VirtFusion and hypervisor.io come to mind as modern/newer alternatives.
For backups Proxmox has the Proxmox Backup Server (PBS), which works very very well.
Dude... VirtFusion! Uncontested! Features, UI, UX, Cost, Support, WHMCS. The whole thing!
But UX is the worst I ever use from the point of the end user. Solusvm is even better.
Proxmox. It's not even a comparison. It just works.
About a week and no team myself...
With a proper team, less than a week to have it fully functional.
Could you post some images of the panel you created or a video of it in action?
We might be able to build our own panel someday.
Just got to our website https://www.avsisp.com and you can see it live mate. Our entire website and client area is built around Proxmox underneath.
Here's a good PHP SDK for getting started:
https://github.com/Saleh7/ProxmoxVE_PHP_API
That will handle most things. But for the NoVNC you'll need to wrap up a python agent to middle-man it and make sure to use tokens and Auth generated in PHP and verified in Python and so on. Run it as a service, etc. It's not too difficult.
Love to Virtfusion. Using it since February 2022!
Own client area and vps panel integration is amazing. Been like this for a few months it's much easier to integrate, add features and maintain specially with proxmox