#175D7A
Closest named color: Petrol (#005F6A). oklch(45% 0.081 230.8), rgb(23, 93, 122).
Aa
White text reads best on this color (7.28:1).
About this color
#175D7A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.081 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.031 away. White text reads best on it, at 7.28:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.88:1 |
| White text | 7.28:1 |
Values
| HEX | #175D7A |
| RGB | rgb(23, 93, 122) |
| HSL | hsl(198, 68%, 28%) |
| OKLCH | oklch(45% 0.081 230.8) |
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 #175D7A | 7.28:1 | AAA | Lc -89.9 | Fine for body text |
| Black text on #175D7A | 2.88:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #175D7A text on white | 7.28:1 | AAA | Lc 85.0 | Fine for body text |
| #175D7A text on black | 2.88:1 | Fails | Lc -17.0 | 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
#6EAAC7
oklch(70.8% 0.075 230.1)
-
Step 500
500
#4294B9
oklch(63.1% 0.097 230.5)
-
Step 600
600
#187EA5
oklch(55.7% 0.105 230.2)
-
Step 700
700
#036A8E
oklch(49.2% 0.098 230.8)
-
Step 800
800 (this color)
#175D7A
oklch(45% 0.081 230.8)
-
Step 900
900
#16475D
oklch(37.6% 0.064 231.5)
-
Step 950
950
#0F2A36
oklch(27% 0.04 229.8)
#175D7A 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) | #4E5C7B | 0.054 |
| Deuteranopia (no green cones) | #41527A | 0.048 |
| Tritanopia (no blue cones) | #006567 | 0.047 |
| Achromatopsia (no color) | #565656 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175D7A
#175D7A
oklch(45% 0.081 230.8)
- #794729
#794729
oklch(45.1% 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 #175D7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.033
- Deep Sea Blue #015482 ΔE 0.036
- YInMn Blue #415A77 ΔE 0.037
- Denim #3B638C ΔE 0.047
- Peacock Blue #016795 ΔE 0.047
- Light Navy #155084 ΔE 0.047
- Dusk Blue #26538D ΔE 0.049
Use #175D7A 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.