COLOR
#28343D
≈ Petrol Slumber
Values · copy any
On white
Aa
12.74:1
Passes AAA
On black
Aa
1.37:1
Fails AA
Best text on this color
Aa#FFFFFF(12.74:1)
Adjust & explore
drag the picker or wheel — values & harmonies update livePicker · drag to explore
Harmonies · live
Colour-blindness preview
Normal vision#28343D
Protanopia#30343D
Deuteranopia#2D313D
Tritanopia#223637
Tints & shades
Color harmonies
Open in scheme generator →Colors that go with Petrol Slumber
Petrol Slumber sits in the blue family. Pair it with warm accents — amber, coral or gold — to stop it feeling cold, or lean into its harmonies below for a ready-made scheme.
Closest named, CSS & systems
Colour namePetrol Slumber#243640ΔE 2.2CSS nameMidnightblue#191970ΔE 12.7Web-safe#333333#333333ΔE 6.9
Pantone & RAL matches are coming soon — those libraries aren't openly licensed for redistribution.
Petrol Slumber — meaning & where to use it
Petrol Slumber is a deep, shadowy blue — it reads as trustworthy, stable and professional. It's a natural fit for corporate, tech and financial brands, and dependable UI chrome. To keep it balanced, pair it with warm accents — amber, coral or gold — to stop it feeling cold.
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Download image1200×1500 — sized for Pinterest, Instagram & social sharing. Free to download and use.
This exact shade isn't a named or standard-set colour, so it isn't indexed — but every tool above works.