#175E7B
Closest named color: Petrol (#005F6A). oklch(45.4% 0.082 230.5), rgb(23, 94, 123).
Aa
White text reads best on this color (7.18:1).
About this color
#175E7B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.082 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.032 away. White text reads best on it, at 7.18:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.92:1 |
| White text | 7.18:1 |
Values
| HEX | #175E7B |
| RGB | rgb(23, 94, 123) |
| HSL | hsl(197, 68%, 29%) |
| OKLCH | oklch(45.4% 0.082 230.5) |
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 #175E7B | 7.18:1 | AAA | Lc -89.5 | Fine for body text |
| Black text on #175E7B | 2.92:1 | Fails | Lc 19.4 | Dividers and decoration only |
| #175E7B text on white | 7.18:1 | AAA | Lc 84.6 | Fine for body text |
| #175E7B text on black | 2.92:1 | Fails | Lc -17.4 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C8DDE8
oklch(88.5% 0.027 230.4)
-
Step 300
300
#A2C7DA
oklch(80.9% 0.048 230.4)
-
Step 400
400
#6DAAC7
oklch(70.7% 0.076 229.7)
-
Step 500
500
#4194B9
oklch(63.1% 0.097 230.3)
-
Step 600
600
#157EA5
oklch(55.6% 0.105 230)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800 (this color)
#175E7B
oklch(45.4% 0.082 230.5)
-
Step 900
900
#15475D
oklch(37.6% 0.064 231.2)
-
Step 950
950
#0F2A36
oklch(27% 0.04 229.8)
#175E7B 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) | #4F5D7C | 0.055 |
| Deuteranopia (no green cones) | #42537B | 0.048 |
| Tritanopia (no blue cones) | #006668 | 0.047 |
| Achromatopsia (no color) | #575757 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175E7B
#175E7B
oklch(45.4% 0.082 230.5)
- #7A482A
#7A482A
oklch(45.4% 0.081 50.5)
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 #175E7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.032
- Light Navy Blue #2E5A88 ΔE 0.032
- YInMn Blue #415A77 ΔE 0.037
- Deep Sea Blue #015482 ΔE 0.038
- Peacock Blue #016795 ΔE 0.045
- Denim #3B638C ΔE 0.045
- Light Navy #155084 ΔE 0.049
- Dark Aqua #05696B ΔE 0.050
Use #175E7B 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.