#15448B
Closest named color: Cobalt (#1E488F). oklch(39.9% 0.129 259), rgb(21, 68, 139).
Aa
White text reads best on this color (9.41:1).
About this color
#15448B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.129 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.016 away. White text reads best on it, at 9.41:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.23:1 |
| White text | 9.41:1 |
Values
| HEX | #15448B |
| RGB | rgb(21, 68, 139) |
| HSL | hsl(216, 74%, 31%) |
| OKLCH | oklch(39.9% 0.129 259) |
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 #15448B | 9.41:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #15448B | 2.23:1 | Fails | Lc 12.7 | Not readable |
| #15448B text on white | 9.41:1 | AAA | Lc 91.3 | Preferred for body text |
| #15448B text on black | 2.23:1 | Fails | Lc -11.1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C4DBFD
oklch(88.5% 0.053 258)
-
Step 300
300
#9BC2FF
oklch(80.8% 0.097 259.2)
-
Step 400
400
#63A0FF
oklch(70.7% 0.154 259)
-
Step 500
500
#3484FE
oklch(63.1% 0.198 259)
-
Step 600
600
#026AED
oklch(55.6% 0.214 258.9)
-
Step 700
700
#0058CA
oklch(49.1% 0.191 259.1)
-
Step 800
800
#0048A7
oklch(42.7% 0.165 259)
-
Step 900
900 (this color)
#15448B
oklch(39.9% 0.129 259)
-
Step 950
950
#0A254D
oklch(27% 0.081 258.5)
#15448B 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) | #184C8E | 0.023 |
| Deuteranopia (no green cones) | #00418A | 0.015 |
| Tritanopia (no blue cones) | #005561 | 0.098 |
| Achromatopsia (no color) | #464646 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15448B
#15448B
oklch(39.9% 0.129 259)
- #5F4100
#5F4100
oklch(39.9% 0.083 79)
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 #15448B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.016
- Twilight Blue #0A437A ΔE 0.030
- Light Navy #155084 ΔE 0.039
- Dusk Blue #26538D ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.051
- Blueberry #464196 ΔE 0.060
- Sapphire #2138AB ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.061
Use #15448B 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.