Does iPhone 6s support iOS 13

https://www.apple.com/ios/ios-13-preview/

iOS 13 is compatible 

with these devices.

Learn more about iPhone

Learn more about iPod touch

• iPhone XS
• iPhone XS Max
• iPhone XR
• iPhone X
• iPhone 8
• iPhone 8 Plus
• iPhone 7
• iPhone 7 Plus
• iPhone 6s
• iPhone 6s Plus
• iPhone SE
• iPod touch (7th generation)

i have iPhone 6s and it is still on iOS 12.3.1 it might get iOS 13

Not might. Will. Look at Rudegar's list and the link he posted to Apple's own list of supported devices.