#175171
Closest named color: Deep Sea Blue (#015482). oklch(41.4% 0.079 237.7), rgb(23, 81, 113).
Aa
White text reads best on this color (8.56:1).
About this color
#175171 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.079 and its hue 238°. 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 8.56:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.45:1 |
| White text | 8.56:1 |
Values
| HEX | #175171 |
| RGB | rgb(23, 81, 113) |
| HSL | hsl(201, 66%, 27%) |
| OKLCH | oklch(41.4% 0.079 237.7) |
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 #175171 | 8.56:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #175171 | 2.45:1 | Fails | Lc 14.8 | Not readable |
| #175171 text on white | 8.56:1 | AAA | Lc 89.1 | Fine for body text |
| #175171 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
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A6C6DB
oklch(81% 0.045 236.9)
-
Step 400
400
#74A8C9
oklch(70.7% 0.073 237)
-
Step 500
500
#4D92BC
oklch(63.2% 0.094 237.5)
-
Step 600
600
#2C7BA8
oklch(55.6% 0.103 237.9)
-
Step 700
700
#1D6890
oklch(49.2% 0.095 237.2)
-
Step 800
800 (this color)
#175171
oklch(41.4% 0.079 237.7)
-
Step 900
900
#1D465E
oklch(37.6% 0.061 237.2)
-
Step 950
950
#122937
oklch(26.9% 0.039 237.4)
#175171 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) | #425172 | 0.045 |
| Deuteranopia (no green cones) | #364870 | 0.037 |
| Tritanopia (no blue cones) | #00595C | 0.051 |
| Achromatopsia (no color) | #4C4C4C | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175171
#175171
oklch(41.4% 0.079 237.7)
- #6B3F1B
#6B3F1B
oklch(41.3% 0.079 57.2)
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 #175171, 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 0.033
- Dark Grey Blue #29465B ΔE 0.044
- Deep Teal #00555A ΔE 0.047
- Dusk Blue #26538D ΔE 0.049
- Petrol #005F6A ΔE 0.049
- Light Navy Blue #2E5A88 ΔE 0.050
- Twilight Blue #0A437A ΔE 0.051
Use #175171 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.