#155D8A
Closest named color: Light Navy Blue (#2E5A88). oklch(45.9% 0.099 242.2), rgb(21, 93, 138).
Aa
White text reads best on this color (7.08:1).
About this color
#155D8A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.099 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.018 away. White text reads best on it, at 7.08:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.96:1 |
| White text | 7.08:1 |
Values
| HEX | #155D8A |
| RGB | rgb(21, 93, 138) |
| HSL | hsl(203, 74%, 31%) |
| OKLCH | oklch(45.9% 0.099 242.2) |
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 #155D8A | 7.08:1 | AAA | Lc -89.1 | Fine for body text |
| Black text on #155D8A | 2.96:1 | Fails | Lc 19.9 | Dividers and decoration only |
| #155D8A text on white | 7.08:1 | AAA | Lc 84.2 | Fine for body text |
| #155D8A text on black | 2.96:1 | Fails | Lc -17.8 | Dividers and decoration only |
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
#E1ECF4
oklch(93.7% 0.016 239.1)
-
Step 200
200
#C7DCED
oklch(88.4% 0.033 242.4)
-
Step 300
300
#A0C6E3
oklch(80.9% 0.058 241.3)
-
Step 400
400
#6AA8D6
oklch(70.8% 0.093 241.9)
-
Step 500
500
#3D91CB
oklch(63.1% 0.119 242.3)
-
Step 600
600
#0C7AB8
oklch(55.6% 0.13 242.4)
-
Step 700
700
#00679D
oklch(49.2% 0.117 242)
-
Step 800
800 (this color)
#155D8A
oklch(45.9% 0.099 242.2)
-
Step 900
900
#134667
oklch(37.8% 0.077 241.9)
-
Step 950
950
#0D293C
oklch(27% 0.049 241.5)
#155D8A 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) | #485E8C | 0.047 |
| Deuteranopia (no green cones) | #385489 | 0.035 |
| Tritanopia (no blue cones) | #00686D | 0.067 |
| Achromatopsia (no color) | #585858 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155D8A
#155D8A
oklch(45.9% 0.099 242.2)
- #7E490D
#7E490D
oklch(45.9% 0.099 62.2)
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 #155D8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.018
- Peacock Blue #016795 ΔE 0.031
- Deep Sea Blue #015482 ΔE 0.031
- Dusk Blue #26538D ΔE 0.032
- Denim Blue #3B5B92 ΔE 0.035
- Denim #3B638C ΔE 0.038
- Light Navy #155084 ΔE 0.039
- YInMn Blue #415A77 ΔE 0.045
Use #155D8A 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.