#155B8A
Closest named color: Light Navy Blue (#2E5A88). oklch(45.4% 0.101 243.9), rgb(21, 91, 138).
Aa
White text reads best on this color (7.25:1).
About this color
#155B8A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.101 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy Blue (#2E5A88), ΔE 0.017 away. White text reads best on it, at 7.25:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Light Navy Blue (#2E5A88) |
| Black text | 2.89:1 |
| White text | 7.25:1 |
Values
| HEX | #155B8A |
| RGB | rgb(21, 91, 138) |
| HSL | hsl(204, 74%, 31%) |
| OKLCH | oklch(45.4% 0.101 243.9) |
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 #155B8A | 7.25:1 | AAA | Lc -89.7 | Fine for body text |
| Black text on #155B8A | 2.89:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #155B8A text on white | 7.25:1 | AAA | Lc 84.8 | Fine for body text |
| #155B8A text on black | 2.89:1 | Fails | Lc -17.2 | 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
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEE
oklch(88.5% 0.033 245.3)
-
Step 300
300
#A1C6E5
oklch(81% 0.059 243.9)
-
Step 400
400
#6BA7D7
oklch(70.6% 0.094 243.8)
-
Step 500
500
#3E90CD
oklch(63% 0.121 244.1)
-
Step 600
600
#1179BA
oklch(55.5% 0.132 244.2)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800 (this color)
#155B8A
oklch(45.4% 0.101 243.9)
-
Step 900
900
#144568
oklch(37.6% 0.079 244.1)
-
Step 950
950
#0E293D
oklch(27.1% 0.05 243.6)
#155B8A 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) | #455D8C | 0.045 |
| Deuteranopia (no green cones) | #345289 | 0.033 |
| Tritanopia (no blue cones) | #00676C | 0.071 |
| Achromatopsia (no color) | #575757 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155B8A
#155B8A
oklch(45.4% 0.101 243.9)
- #7C4803
#7C4803
oklch(45.3% 0.101 64.3)
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 #155B8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy Blue #2E5A88 ΔE 0.017
- Dusk Blue #26538D ΔE 0.026
- Deep Sea Blue #015482 ΔE 0.026
- Light Navy #155084 ΔE 0.033
- Denim Blue #3B5B92 ΔE 0.035
- Peacock Blue #016795 ΔE 0.036
- Denim #3B638C ΔE 0.042
- YInMn Blue #415A77 ΔE 0.047
Use #155B8A 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.