Only for razer?

Yes, Razer Software only works on Razer Hardware.

ARMOR_152
Yes, Razer Software only works on Razer Hardware.

And some razer partners with limited usage like philips hue :P

also razer cortex?

Cortex works on any PC, Synapse/Chroma is for Razer stuff.

cortex doesn't need razer products, synapse (from rgb point of view) works with some non-razer ones, like thermaltake and MSI rgb, but I don't know which ones are compatible exactly

It would be cool if it was compatible with other stuff, there are some non Razer products I’m looking at {tbh there are so many cool keyboards I’ll probably just have a collection} And it would be cool if I wouldn’t have to run three different software programs for different things :3 So far my gaming arsenal is the Razer Blade 15 the Meka headset and a PS4 controller And I’m kind of agonising over other peripherals just because I’m not sure if I want that extra ease of use with the software by maintaining brand loyalty or buy other things that are also highly regarded. Tbh I think I’ll just a mass a collection of peripherals xP Too many cool keyboards and mice out there Still would be nice if the software worked with all RGB devices :3