#15417B
Closest named color: Twilight Blue (#0A437A). oklch(38% 0.11 256.9), rgb(21, 65, 123).
Aa
White text reads best on this color (10.12:1).
About this color
#15417B is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.110 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.008 away. White text reads best on it, at 10.12:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.07:1 |
| White text | 10.12:1 |
Values
| HEX | #15417B |
| RGB | rgb(21, 65, 123) |
| HSL | hsl(214, 71%, 28%) |
| OKLCH | oklch(38% 0.11 256.9) |
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 #15417B | 10.12:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #15417B | 2.07:1 | Fails | Lc 10.8 | Not readable |
| #15417B text on white | 10.12:1 | AAA | Lc 93.1 | Preferred for body text |
| #15417B text on black | 2.07:1 | Fails | Lc -9.4 | 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
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF8
oklch(88.5% 0.046 256.5)
-
Step 300
300
#9FC3F6
oklch(80.9% 0.082 257.1)
-
Step 400
400
#69A2F1
oklch(70.7% 0.131 256.8)
-
Step 500
500
#3E88ED
oklch(63.1% 0.169 257.1)
-
Step 600
600
#176FDB
oklch(55.5% 0.183 257)
-
Step 700
700
#055CBE
oklch(49% 0.17 257)
-
Step 800
800
#0C4C9A
oklch(42.7% 0.141 256.9)
-
Step 900
900 (this color)
#15417B
oklch(38% 0.11 256.9)
-
Step 950
950
#0D2648
oklch(27% 0.07 257)
#15417B 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) | #22467D | 0.020 |
| Deuteranopia (no green cones) | #0A3D7A | 0.015 |
| Tritanopia (no blue cones) | #004F58 | 0.084 |
| Achromatopsia (no color) | #424242 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15417B
#15417B
oklch(38% 0.11 256.9)
- #5A3C00
#5A3C00
oklch(38.1% 0.08 77.1)
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 #15417B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.008
- Cobalt #1E488F ΔE 0.039
- Marine Blue #01386A ΔE 0.042
- Light Navy #155084 ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.056
- Dusk Blue #26538D ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.067
Use #15417B 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.