#155F80
Closest named color: Light Navy Blue (#2E5A88). oklch(45.8% 0.087 233.3), rgb(21, 95, 128).
Aa
White text reads best on this color (7.04:1).
About this color
#155F80 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.087 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.028 away. White text reads best on it, at 7.04:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.98:1 |
| White text | 7.04:1 |
Values
| HEX | #155F80 |
| RGB | rgb(21, 95, 128) |
| HSL | hsl(199, 72%, 29%) |
| OKLCH | oklch(45.8% 0.087 233.3) |
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 #155F80 | 7.04:1 | AAA | Lc -89.0 | Fine for body text |
| Black text on #155F80 | 2.98:1 | Fails | Lc 20.0 | Dividers and decoration only |
| #155F80 text on white | 7.04:1 | AAA | Lc 84.0 | Fine for body text |
| #155F80 text on black | 2.98:1 | Fails | Lc -17.9 | 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
#6BAACB
oklch(70.8% 0.081 232.4)
-
Step 500
500
#3D94BE
oklch(63.2% 0.104 232.8)
-
Step 600
600
#0B7DAA
oklch(55.5% 0.112 233.2)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800 (this color)
#155F80
oklch(45.8% 0.087 233.3)
-
Step 900
900
#134760
oklch(37.7% 0.068 234)
-
Step 950
950
#0E2A38
oklch(27.1% 0.042 233.2)
#155F80 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) | #4F5E82 | 0.056 |
| Deuteranopia (no green cones) | #40547F | 0.046 |
| Tritanopia (no blue cones) | #00686A | 0.053 |
| Achromatopsia (no color) | #595959 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155F80
#155F80
oklch(45.8% 0.087 233.3)
- #7D4925
#7D4925
oklch(45.9% 0.087 53.4)
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 #155F80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.028
- Peacock Blue #016795 ΔE 0.037
- Deep Sea Blue #015482 ΔE 0.037
- YInMn Blue #415A77 ΔE 0.038
- Petrol #005F6A ΔE 0.039
- Denim #3B638C ΔE 0.040
- Dusk Blue #26538D ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.047
Use #155F80 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.