#15437A
Closest named color: Twilight Blue (#0A437A). oklch(38.4% 0.106 255.3), rgb(21, 67, 122).
Aa
White text reads best on this color (9.92:1).
About this color
#15437A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.106 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.006 away. White text reads best on it, at 9.92:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.11:1 |
| White text | 9.92:1 |
Values
| HEX | #15437A |
| RGB | rgb(21, 67, 122) |
| HSL | hsl(213, 71%, 28%) |
| OKLCH | oklch(38.4% 0.106 255.3) |
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 #15437A | 9.92:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #15437A | 2.11:1 | Fails | Lc 11.3 | Not readable |
| #15437A text on white | 9.92:1 | AAA | Lc 92.6 | Preferred for body text |
| #15437A text on black | 2.11:1 | Fails | Lc -9.8 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9FC3F4
oklch(80.8% 0.08 256.2)
-
Step 400
400
#68A3EE
oklch(70.7% 0.127 255.1)
-
Step 500
500
#3C8AE9
oklch(63.2% 0.162 255.2)
-
Step 600
600
#1271D7
oklch(55.6% 0.176 255.3)
-
Step 700
700
#005EBA
oklch(49.1% 0.163 255.3)
-
Step 800
800
#084D97
oklch(42.6% 0.137 255.4)
-
Step 900
900 (this color)
#15437A
oklch(38.4% 0.106 255.3)
-
Step 950
950
#0D2746
oklch(27.1% 0.066 254.6)
#15437A 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) | #27487C | 0.024 |
| Deuteranopia (no green cones) | #133F79 | 0.012 |
| Tritanopia (no blue cones) | #005058 | 0.080 |
| Achromatopsia (no color) | #434343 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15437A
#15437A
oklch(38.4% 0.106 255.3)
- #5C3C00
#5C3C00
oklch(38.4% 0.081 75.2)
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 #15437A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.006
- Cobalt #1E488F ΔE 0.038
- Light Navy #155084 ΔE 0.040
- Marine Blue #01386A ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.050
- Dusk Blue #26538D ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.068
Use #15437A 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.