#155F81
Closest named color: Light Navy Blue (#2E5A88). oklch(45.9% 0.088 234.1), rgb(21, 95, 129).
Aa
White text reads best on this color (7.03:1).
About this color
#155F81 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.088 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.027 away. White text reads best on it, at 7.03:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.98:1 |
| White text | 7.03:1 |
Values
| HEX | #155F81 |
| RGB | rgb(21, 95, 129) |
| HSL | hsl(199, 72%, 29%) |
| OKLCH | oklch(45.9% 0.088 234.1) |
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 #155F81 | 7.03:1 | AAA | Lc -89.0 | Fine for body text |
| Black text on #155F81 | 2.98:1 | Fails | Lc 20.0 | Dividers and decoration only |
| #155F81 text on white | 7.03:1 | AAA | Lc 84.0 | Fine for body text |
| #155F81 text on black | 2.98:1 | Fails | Lc -18.0 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE9
oklch(88.6% 0.028 232.7)
-
Step 300
300
#A1C7DD
oklch(80.9% 0.051 233.6)
-
Step 400
400
#6BA9CC
oklch(70.6% 0.082 234.4)
-
Step 500
500
#3D93BF
oklch(63% 0.105 234.3)
-
Step 600
600
#0B7DAB
oklch(55.6% 0.113 233.8)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800 (this color)
#155F81
oklch(45.9% 0.088 234.1)
-
Step 900
900
#134760
oklch(37.7% 0.068 234)
-
Step 950
950
#0D2A38
oklch(27% 0.043 232.5)
#155F81 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) | #4E5E83 | 0.054 |
| Deuteranopia (no green cones) | #405480 | 0.046 |
| Tritanopia (no blue cones) | #00686B | 0.053 |
| Achromatopsia (no color) | #595959 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155F81
#155F81
oklch(45.9% 0.088 234.1)
- #7D4923
#7D4923
oklch(45.9% 0.088 54.5)
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 #155F81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.027
- Peacock Blue #016795 ΔE 0.036
- Deep Sea Blue #015482 ΔE 0.037
- YInMn Blue #415A77 ΔE 0.039
- Denim #3B638C ΔE 0.039
- Petrol #005F6A ΔE 0.041
- Dusk Blue #26538D ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.046
Use #155F81 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.