#155173
Closest named color: Deep Sea Blue (#015482). oklch(41.5% 0.082 238.8), rgb(21, 81, 115).
Aa
White text reads best on this color (8.54:1).
About this color
#155173 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.082 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.025 away. White text reads best on it, at 8.54:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.45:1 |
| White text | 8.54:1 |
Values
| HEX | #155173 |
| RGB | rgb(21, 81, 115) |
| HSL | hsl(202, 69%, 27%) |
| OKLCH | oklch(41.5% 0.082 238.8) |
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 #155173 | 8.54:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #155173 | 2.45:1 | Fails | Lc 14.9 | Not readable |
| #155173 text on white | 8.54:1 | AAA | Lc 89.1 | Fine for body text |
| #155173 text on black | 2.45:1 | Fails | Lc -13.1 | Not readable |
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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE9
oklch(88.5% 0.026 239.1)
-
Step 300
300
#A5C6DD
oklch(81% 0.048 238.6)
-
Step 400
400
#73A8CB
oklch(70.8% 0.076 238.2)
-
Step 500
500
#4B91BE
oklch(63% 0.098 239.1)
-
Step 600
600
#297BAA
oklch(55.6% 0.106 238.5)
-
Step 700
700
#1A6792
oklch(49% 0.099 238.9)
-
Step 800
800 (this color)
#155173
oklch(41.5% 0.082 238.8)
-
Step 900
900
#1C4660
oklch(37.7% 0.064 238.9)
-
Step 950
950
#122938
oklch(27% 0.04 239.2)
#155173 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) | #415175 | 0.044 |
| Deuteranopia (no green cones) | #344872 | 0.036 |
| Tritanopia (no blue cones) | #005A5D | 0.054 |
| Achromatopsia (no color) | #4C4C4C | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155173
#155173
oklch(41.5% 0.082 238.8)
- #6C3F17
#6C3F17
oklch(41.4% 0.082 58.7)
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 #155173, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.025
- Light Navy #155084 ΔE 0.030
- Dark Grey Blue #29465B ΔE 0.046
- Dusk Blue #26538D ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.048
- Twilight Blue #0A437A ΔE 0.049
- Deep Teal #00555A ΔE 0.050
- Petrol #005F6A ΔE 0.051
Use #155173 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.