#17517C
Closest named color: Deep Sea Blue (#015482). oklch(42.1% 0.092 245.4), rgb(23, 81, 124).
Aa
White text reads best on this color (8.38:1).
About this color
#17517C is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.092 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.013 away. White text reads best on it, at 8.38:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.50:1 |
| White text | 8.38:1 |
Values
| HEX | #17517C |
| RGB | rgb(23, 81, 124) |
| HSL | hsl(206, 69%, 29%) |
| OKLCH | oklch(42.1% 0.092 245.4) |
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 #17517C | 8.38:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #17517C | 2.50:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #17517C text on white | 8.38:1 | AAA | Lc 88.6 | Fine for body text |
| #17517C text on black | 2.50:1 | Fails | Lc -13.6 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADCEC
oklch(88.6% 0.029 244.9)
-
Step 300
300
#A4C5E2
oklch(80.9% 0.054 245.1)
-
Step 400
400
#72A6D3
oklch(70.6% 0.086 245.5)
-
Step 500
500
#4A8FC8
oklch(63% 0.111 245.8)
-
Step 600
600
#2979B5
oklch(55.7% 0.12 245.4)
-
Step 700
700
#1A659B
oklch(49% 0.111 245.4)
-
Step 800
800 (this color)
#17517C
oklch(42.1% 0.092 245.4)
-
Step 900
900
#1C4565
oklch(37.7% 0.072 245)
-
Step 950
950
#12283B
oklch(26.9% 0.045 246.6)
#17517C 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) | #3D537E | 0.038 |
| Deuteranopia (no green cones) | #2F497B | 0.029 |
| Tritanopia (no blue cones) | #005B60 | 0.065 |
| Achromatopsia (no color) | #4E4E4E | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17517C
#17517C
oklch(42.1% 0.092 245.4)
- #6F4103
#6F4103
oklch(42.1% 0.093 65.4)
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 #17517C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.013
- Light Navy #155084 ΔE 0.014
- Dusk Blue #26538D ΔE 0.032
- Light Navy Blue #2E5A88 ΔE 0.039
- Twilight Blue #0A437A ΔE 0.045
- Cobalt #1E488F ΔE 0.045
- YInMn Blue #415A77 ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.058
Use #17517C 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.