#155A7E
Closest named color: Deep Sea Blue (#015482). oklch(44.4% 0.088 237.2), rgb(21, 90, 126).
Aa
White text reads best on this color (7.51:1).
About this color
#155A7E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.088 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.024 away. White text reads best on it, at 7.51:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.79:1 |
| White text | 7.51:1 |
Values
| HEX | #155A7E |
| RGB | rgb(21, 90, 126) |
| HSL | hsl(201, 71%, 29%) |
| OKLCH | oklch(44.4% 0.088 237.2) |
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 #155A7E | 7.51:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #155A7E | 2.79:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #155A7E text on white | 7.51:1 | AAA | Lc 85.7 | Fine for body text |
| #155A7E text on black | 2.79:1 | Fails | Lc -16.3 | 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
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DCEA
oklch(88.4% 0.029 238.3)
-
Step 300
300
#A2C6DE
oklch(80.8% 0.051 237.5)
-
Step 400
400
#6DA9CE
oklch(70.8% 0.083 236.7)
-
Step 500
500
#4292C1
oklch(63% 0.105 237.5)
-
Step 600
600
#197CAD
oklch(55.6% 0.113 236.9)
-
Step 700
700
#046895
oklch(49.1% 0.106 237.3)
-
Step 800
800 (this color)
#155A7E
oklch(44.4% 0.088 237.2)
-
Step 900
900
#164661
oklch(37.6% 0.069 237.5)
-
Step 950
950
#0F2939
oklch(26.9% 0.044 238.4)
#155A7E 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) | #495A80 | 0.050 |
| Deuteranopia (no green cones) | #3B507D | 0.041 |
| Tritanopia (no blue cones) | #006366 | 0.056 |
| Achromatopsia (no color) | #555555 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155A7E
#155A7E
oklch(44.4% 0.088 237.2)
- #78461C
#78461C
oklch(44.6% 0.088 57.4)
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 #155A7E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.024
- Light Navy Blue #2E5A88 ΔE 0.026
- Light Navy #155084 ΔE 0.035
- Dusk Blue #26538D ΔE 0.038
- YInMn Blue #415A77 ΔE 0.040
- Petrol #005F6A ΔE 0.042
- Peacock Blue #016795 ΔE 0.048
- Denim Blue #3B5B92 ΔE 0.048
Use #155A7E 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.