#175371
Closest named color: Deep Sea Blue (#015482). oklch(41.9% 0.078 235.2), rgb(23, 83, 113).
Aa
White text reads best on this color (8.35:1).
About this color
#175371 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.078 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.028 away. White text reads best on it, at 8.35:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.51:1 |
| White text | 8.35:1 |
Values
| HEX | #175371 |
| RGB | rgb(23, 83, 113) |
| HSL | hsl(200, 66%, 27%) |
| OKLCH | oklch(41.9% 0.078 235.2) |
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 #175371 | 8.35:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #175371 | 2.51:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #175371 text on white | 8.35:1 | AAA | Lc 88.5 | Fine for body text |
| #175371 text on black | 2.51:1 | Fails | Lc -13.7 | 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
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A5C6DA
oklch(80.9% 0.045 234.7)
-
Step 400
400
#73A8C8
oklch(70.6% 0.073 235.7)
-
Step 500
500
#4B92BA
oklch(63% 0.093 235.6)
-
Step 600
600
#2A7CA6
oklch(55.6% 0.101 235.4)
-
Step 700
700
#1B688E
oklch(49% 0.094 235.5)
-
Step 800
800 (this color)
#175371
oklch(41.9% 0.078 235.2)
-
Step 900
900
#1D465D
oklch(37.6% 0.06 236.1)
-
Step 950
950
#122936
oklch(26.9% 0.038 235.3)
#175371 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) | #445272 | 0.046 |
| Deuteranopia (no green cones) | #384A71 | 0.039 |
| Tritanopia (no blue cones) | #005B5D | 0.050 |
| Achromatopsia (no color) | #4E4E4E | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175371
#175371
oklch(41.9% 0.078 235.2)
- #6D401F
#6D401F
oklch(41.9% 0.078 54.8)
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 #175371, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.028
- Light Navy #155084 ΔE 0.036
- Petrol #005F6A ΔE 0.043
- Deep Teal #00555A ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.048
- Dusk Blue #26538D ΔE 0.050
- YInMn Blue #415A77 ΔE 0.050
Use #175371 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.