#175999
Closest named color: Dusk Blue (#26538D). oklch(45.9% 0.122 252), rgb(23, 89, 153).
Aa
White text reads best on this color (7.17:1).
About this color
#175999 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.122 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.024 away. White text reads best on it, at 7.17:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.92:1 |
| White text | 7.17:1 |
Values
| HEX | #175999 |
| RGB | rgb(23, 89, 153) |
| HSL | hsl(210, 74%, 35%) |
| OKLCH | oklch(45.9% 0.122 252) |
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 #175999 | 7.17:1 | AAA | Lc -89.4 | Fine for body text |
| Black text on #175999 | 2.92:1 | Fails | Lc 19.6 | Dividers and decoration only |
| #175999 text on white | 7.17:1 | AAA | Lc 84.5 | Fine for body text |
| #175999 text on black | 2.92:1 | Fails | Lc -17.5 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF3
oklch(88.4% 0.04 253)
-
Step 300
300
#A0C4EE
oklch(80.9% 0.071 252.6)
-
Step 400
400
#6AA5E6
oklch(70.8% 0.114 251.9)
-
Step 500
500
#3D8CDE
oklch(63% 0.146 252)
-
Step 600
600
#1374CC
oklch(55.5% 0.159 252.2)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800 (this color)
#175999
oklch(45.9% 0.122 252)
-
Step 900
900
#144372
oklch(37.8% 0.095 251.9)
-
Step 950
950
#0D2743
oklch(26.9% 0.061 252.5)
#175999 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) | #395E9C | 0.034 |
| Deuteranopia (no green cones) | #235298 | 0.020 |
| Tritanopia (no blue cones) | #006871 | 0.090 |
| Achromatopsia (no color) | #575757 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #175999
#175999
oklch(45.9% 0.122 252)
- #794D00
#794D00
oklch(45.9% 0.098 71.9)
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 #175999, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.024
- Light Navy Blue #2E5A88 ΔE 0.032
- Denim Blue #3B5B92 ΔE 0.033
- Light Navy #155084 ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.041
- Peacock Blue #016795 ΔE 0.043
- Cobalt #1E488F ΔE 0.049
- Dusky Blue #475F94 ΔE 0.051
Use #175999 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.