5-step gradient: Luminous vivid red (#ff0000) to Luminous vivid yellow (#ffff00).

RGB Gradient: Luminous vivid red to Luminous vivid yellow

Spot colors

 
 
 
 
 
#ff0000 #ff3f00 #ff7f00 #ffbf00 #ffff00
Export palette (gpl/png/ase)

Linear gradient

CSS
background-image: linear-gradient(135deg, #ff0000, #ffff00);
Output

HSV Clockwise Gradient: Luminous vivid red to Luminous vivid yellow

Spot colors

 
 
 
 
 
#ff0000 #ff3f00 #ff7f00 #ffbf00 #fffe00
Export palette (gpl/png/ase)

Linear gradient

CSS
background-image: linear-gradient(135deg, #ff0000, #ff3f00, #ff7f00, #ffbf00, #fffe00);
Output

HSV Counterclockwise Gradient: Luminous vivid red to Luminous vivid yellow

Spot colors

 
 
 
 
 
#ff0000 #bf00ff #007fff #00ff3f #ffff00
Export palette (gpl/png/ase)

Linear gradient

CSS
background-image: linear-gradient(135deg, #ff0000, #bf00ff, #007fff, #00ff3f, #ffff00);
Output