#28437B
Closest named color: Twilight Blue (#0A437A). oklch(39.2% 0.101 263.2), rgb(40, 67, 123).
Aa
White text reads best on this color (9.63:1).
About this color
#28437B is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.101 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 9.63:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.17:1 |
| White text | 9.63:1 |
Values
| HEX | #28437B |
| RGB | rgb(40, 67, 123) |
| HSL | hsl(220, 51%, 32%) |
| OKLCH | oklch(39.2% 0.101 263.2) |
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 #28437B | 9.63:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #28437B | 2.17:1 | Fails | Lc 11.9 | Not readable |
| #28437B text on white | 9.63:1 | AAA | Lc 92.1 | Preferred for body text |
| #28437B text on black | 2.17:1 | Fails | Lc -10.3 | 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 900.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF6
oklch(88.6% 0.042 263)
-
Step 300
300
#A7C1F2
oklch(80.9% 0.075 262.9)
-
Step 400
400
#799FEC
oklch(70.7% 0.121 263.6)
-
Step 500
500
#5785E6
oklch(63.1% 0.155 263.5)
-
Step 600
600
#3C6DD4
oklch(55.6% 0.168 263)
-
Step 700
700
#2F5AB8
oklch(49.1% 0.157 263.3)
-
Step 800
800
#274A95
oklch(42.7% 0.13 263.2)
-
Step 900
900 (this color)
#28437B
oklch(39.2% 0.101 263.2)
-
Step 950
950
#152545
oklch(26.9% 0.064 262.8)
#28437B 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) | #29497D | 0.018 |
| Deuteranopia (no green cones) | #1B417A | 0.015 |
| Tritanopia (no blue cones) | #005059 | 0.083 |
| Achromatopsia (no color) | #454545 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28437B
#28437B
oklch(39.2% 0.101 263.2)
- #5A4100
#5A4100
oklch(39.2% 0.081 83.7)
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 #28437B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Cobalt #1E488F ΔE 0.035
- Light Navy #155084 ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.051
- Dusk Blue #26538D ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.055
- Marine Blue #01386A ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.058
Use #28437B 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.