#28537C
Closest named color: Deep Sea Blue (#015482). oklch(43.2% 0.083 249.3), rgb(40, 83, 124).
Aa
White text reads best on this color (8.01:1).
About this color
#28537C is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.083 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.022 away. White text reads best on it, at 8.01:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.61:1 |
| White text | 8.01:1 |
Values
| HEX | #28537C |
| RGB | rgb(40, 83, 124) |
| HSL | hsl(209, 51%, 32%) |
| OKLCH | oklch(43.2% 0.083 249.3) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #28537C | 8.01:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #28537C | 2.61:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #28537C text on white | 8.01:1 | AAA | Lc 87.6 | Fine for body text |
| #28537C text on black | 2.61:1 | Fails | Lc -14.6 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CCDBEB
oklch(88.5% 0.027 249.9)
-
Step 300
300
#A9C4DF
oklch(80.9% 0.048 248.4)
-
Step 400
400
#7BA5D0
oklch(70.8% 0.078 249.6)
-
Step 500
500
#588EC3
oklch(63.1% 0.099 249.2)
-
Step 600
600
#3B77B0
oklch(55.6% 0.109 249.3)
-
Step 700
700
#2D6497
oklch(49.1% 0.101 249.1)
-
Step 800
800 (this color)
#28537C
oklch(43.2% 0.083 249.3)
-
Step 900
900
#244463
oklch(37.7% 0.066 249.2)
-
Step 950
950
#16283A
oklch(27.1% 0.041 249.6)
#28537C with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #41557E | 0.030 |
| Deuteranopia (no green cones) | #364D7B | 0.021 |
| Tritanopia (no blue cones) | #005D62 | 0.065 |
| Achromatopsia (no color) | #505050 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28537C
#28537C
oklch(43.2% 0.083 249.3)
- #6D4713
#6D4713
oklch(43.2% 0.083 69.9)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #28537C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.022
- Light Navy #155084 ΔE 0.023
- Light Navy Blue #2E5A88 ΔE 0.028
- Dusk Blue #26538D ΔE 0.028
- YInMn Blue #415A77 ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.047
- Dusk #4E5481 ΔE 0.049
- Cobalt #1E488F ΔE 0.051
Use #28537C in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.