#15557F
Closest named color: Deep Sea Blue (#015482). oklch(43.2% 0.093 242.9), rgb(21, 85, 127).
Aa
White text reads best on this color (7.96:1).
About this color
#15557F is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.093 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.010 away. White text reads best on it, at 7.96:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.63:1 |
| White text | 7.96:1 |
Values
| HEX | #15557F |
| RGB | rgb(21, 85, 127) |
| HSL | hsl(204, 72%, 29%) |
| OKLCH | oklch(43.2% 0.093 242.9) |
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 #15557F | 7.96:1 | AAA | Lc -92.0 | Preferred for body text |
| Black text on #15557F | 2.63:1 | Fails | Lc 16.8 | Dividers and decoration only |
| #15557F text on white | 7.96:1 | AAA | Lc 87.2 | Fine for body text |
| #15557F text on black | 2.63:1 | Fails | Lc -14.9 | 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 800.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A3C5E1
oklch(80.8% 0.054 243.3)
-
Step 400
400
#6FA7D3
oklch(70.7% 0.087 243.1)
-
Step 500
500
#4590C7
oklch(63% 0.112 243.1)
-
Step 600
600
#207AB4
oklch(55.7% 0.121 242.7)
-
Step 700
700
#10669B
oklch(49.1% 0.113 243.2)
-
Step 800
800 (this color)
#15557F
oklch(43.2% 0.093 242.9)
-
Step 900
900
#194565
oklch(37.6% 0.073 243.7)
-
Step 950
950
#10293B
oklch(27.1% 0.046 242.4)
#15557F 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) | #415681 | 0.042 |
| Deuteranopia (no green cones) | #334D7E | 0.032 |
| Tritanopia (no blue cones) | #005F64 | 0.063 |
| Achromatopsia (no color) | #515151 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15557F
#15557F
oklch(43.2% 0.093 242.9)
- #73430B
#73430B
oklch(43.1% 0.093 63.1)
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 #15557F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.010
- Light Navy #155084 ΔE 0.019
- Dusk Blue #26538D ΔE 0.029
- Light Navy Blue #2E5A88 ΔE 0.030
- YInMn Blue #415A77 ΔE 0.048
- Cobalt #1E488F ΔE 0.050
- Denim Blue #3B5B92 ΔE 0.051
- Petrol #005F6A ΔE 0.054
Use #15557F 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.