#15397A
Closest named color: Twilight Blue (#0A437A). oklch(36% 0.119 261.1), rgb(21, 57, 122).
Aa
White text reads best on this color (11.06:1).
About this color
#15397A is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.119 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.029 away. White text reads best on it, at 11.06:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.89:1 |
| White text | 11.06:1 |
Values
| HEX | #15397A |
| RGB | rgb(21, 57, 122) |
| HSL | hsl(219, 71%, 28%) |
| OKLCH | oklch(36% 0.119 261.1) |
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 #15397A | 11.06:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #15397A | 1.89:1 | Fails | Lc 8.8 | Not readable |
| #15397A text on white | 11.06:1 | AAA | Lc 95.1 | Preferred for body text |
| #15397A text on black | 1.89:1 | Fails | Lc -7.5 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFB
oklch(88.5% 0.05 261.5)
-
Step 300
300
#A0C2FB
oklch(81% 0.089 260.6)
-
Step 400
400
#6D9FF9
oklch(70.7% 0.143 261.4)
-
Step 500
500
#4584F5
oklch(63% 0.182 261)
-
Step 600
600
#276AE4
oklch(55.5% 0.198 261.2)
-
Step 700
700
#1A58C6
oklch(49.1% 0.183 261)
-
Step 800
800
#1849A0
oklch(42.8% 0.151 261)
-
Step 900
900 (this color)
#15397A
oklch(36% 0.119 261.1)
-
Step 950
950
#10254B
oklch(27.1% 0.076 261.2)
#15397A 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) | #0E417C | 0.022 |
| Deuteranopia (no green cones) | #003779 | 0.015 |
| Tritanopia (no blue cones) | #004953 | 0.093 |
| Achromatopsia (no color) | #3C3C3C | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15397A
#15397A
oklch(36% 0.119 261.1)
- #513800
#513800
oklch(36% 0.074 80.6)
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 #15397A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.029
- Marine Blue #01386A ΔE 0.031
- Cobalt #1E488F ΔE 0.055
- Marine #042E60 ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.060
- Light Navy #155084 ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.076
- Dark Grey Blue #29465B ΔE 0.076
Use #15397A 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.