#17577B
Closest named color: Deep Sea Blue (#015482). oklch(43.5% 0.086 238.6), rgb(23, 87, 123).
Aa
White text reads best on this color (7.81:1).
About this color
#17577B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.086 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.019 away. White text reads best on it, at 7.81:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.68:1 |
| White text | 7.81:1 |
Values
| HEX | #17577B |
| RGB | rgb(23, 87, 123) |
| HSL | hsl(202, 68%, 29%) |
| OKLCH | oklch(43.5% 0.086 238.6) |
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 #17577B | 7.81:1 | AAA | Lc -91.6 | Preferred for body text |
| Black text on #17577B | 2.68:1 | Fails | Lc 17.2 | Dividers and decoration only |
| #17577B text on white | 7.81:1 | AAA | Lc 86.8 | Fine for body text |
| #17577B text on black | 2.68:1 | Fails | Lc -15.3 | 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
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEA
oklch(88.5% 0.028 239.7)
-
Step 300
300
#A3C6DE
oklch(80.9% 0.051 238.2)
-
Step 400
400
#70A8CD
oklch(70.7% 0.08 238.4)
-
Step 500
500
#4692C1
oklch(63.2% 0.103 238.5)
-
Step 600
600
#217BAD
oklch(55.5% 0.112 238.7)
-
Step 700
700
#116895
oklch(49.2% 0.104 238.5)
-
Step 800
800 (this color)
#17577B
oklch(43.5% 0.086 238.6)
-
Step 900
900
#194661
oklch(37.7% 0.067 238.6)
-
Step 950
950
#102939
oklch(26.9% 0.043 239.2)
#17577B 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) | #46577D | 0.047 |
| Deuteranopia (no green cones) | #384E7A | 0.037 |
| Tritanopia (no blue cones) | #006064 | 0.055 |
| Achromatopsia (no color) | #525252 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17577B
#17577B
oklch(43.5% 0.086 238.6)
- #74441A
#74441A
oklch(43.6% 0.086 58.4)
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 #17577B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.019
- Light Navy #155084 ΔE 0.029
- Light Navy Blue #2E5A88 ΔE 0.030
- Dusk Blue #26538D ΔE 0.037
- YInMn Blue #415A77 ΔE 0.042
- Petrol #005F6A ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.053
- Denim #3B638C ΔE 0.056
Use #17577B 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.