#15497C
Closest named color: Twilight Blue (#0A437A). oklch(40% 0.101 251.7), rgb(21, 73, 124).
Aa
White text reads best on this color (9.22:1).
About this color
#15497C is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.101 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.020 away. White text reads best on it, at 9.22:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #15497C |
| RGB | rgb(21, 73, 124) |
| HSL | hsl(210, 71%, 28%) |
| OKLCH | oklch(40% 0.101 251.7) |
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 #15497C | 9.22:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #15497C | 2.27:1 | Fails | Lc 13.1 | Not readable |
| #15497C text on white | 9.22:1 | AAA | Lc 90.9 | Preferred for body text |
| #15497C text on black | 2.27:1 | Fails | Lc -11.4 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C5DCF5
oklch(88.5% 0.042 250.5)
-
Step 300
300
#9DC4F1
oklch(80.8% 0.076 252.3)
-
Step 400
400
#65A5EA
oklch(70.8% 0.121 251.5)
-
Step 500
500
#348CE4
oklch(63.1% 0.156 251.8)
-
Step 600
600
#0074CF
oklch(55.5% 0.165 251.7)
-
Step 700
700
#0061AF
oklch(49% 0.146 251.8)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900 (this color)
#15497C
oklch(40% 0.101 251.7)
-
Step 950
950
#0B2745
oklch(26.9% 0.065 252.8)
#15497C 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) | #304D7E | 0.029 |
| Deuteranopia (no green cones) | #20437B | 0.018 |
| Tritanopia (no blue cones) | #00555C | 0.075 |
| Achromatopsia (no color) | #474747 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15497C
#15497C
oklch(40% 0.101 251.7)
- #643E00
#643E00
oklch(39.9% 0.086 70.8)
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 #15497C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.020
- Light Navy #155084 ΔE 0.023
- Deep Sea Blue #015482 ΔE 0.032
- Cobalt #1E488F ΔE 0.034
- Dusk Blue #26538D ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.056
- Light Navy Blue #2E5A88 ΔE 0.060
- Marine Blue #01386A ΔE 0.060
Use #15497C 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.