#17537F
Closest named color: Deep Sea Blue (#015482). oklch(42.7% 0.094 245.3), rgb(23, 83, 127).
Aa
White text reads best on this color (8.13:1).
About this color
#17537F is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.094 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.009 away. White text reads best on it, at 8.13:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.58:1 |
| White text | 8.13:1 |
Values
| HEX | #17537F |
| RGB | rgb(23, 83, 127) |
| HSL | hsl(205, 69%, 29%) |
| OKLCH | oklch(42.7% 0.094 245.3) |
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 #17537F | 8.13:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #17537F | 2.58:1 | Fails | Lc 16.2 | Dividers and decoration only |
| #17537F text on white | 8.13:1 | AAA | Lc 87.8 | Fine for body text |
| #17537F text on black | 2.58:1 | Fails | Lc -14.3 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCED
oklch(88.6% 0.031 245.1)
-
Step 300
300
#A4C5E3
oklch(80.9% 0.055 246)
-
Step 400
400
#71A6D4
oklch(70.6% 0.088 245.7)
-
Step 500
500
#4890C9
oklch(63.2% 0.112 244.9)
-
Step 600
600
#2679B6
oklch(55.7% 0.122 245.3)
-
Step 700
700
#17659D
oklch(49% 0.115 245.8)
-
Step 800
800 (this color)
#17537F
oklch(42.7% 0.094 245.3)
-
Step 900
900
#1B4566
oklch(37.8% 0.073 245.3)
-
Step 950
950
#11283C
oklch(26.9% 0.047 246.9)
#17537F 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) | #3E5581 | 0.039 |
| Deuteranopia (no green cones) | #304B7E | 0.029 |
| Tritanopia (no blue cones) | #005E63 | 0.067 |
| Achromatopsia (no color) | #4F4F4F | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17537F
#17537F
oklch(42.7% 0.094 245.3)
- #724203
#724203
oklch(42.7% 0.095 64.4)
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 #17537F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.009
- Light Navy #155084 ΔE 0.014
- Dusk Blue #26538D ΔE 0.027
- Light Navy Blue #2E5A88 ΔE 0.033
- Cobalt #1E488F ΔE 0.045
- Twilight Blue #0A437A ΔE 0.050
- YInMn Blue #415A77 ΔE 0.051
- Denim Blue #3B5B92 ΔE 0.053
Use #17537F 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.