#17397C
Closest named color: Twilight Blue (#0A437A). oklch(36.2% 0.121 262), rgb(23, 57, 124).
Aa
White text reads best on this color (10.97:1).
About this color
#17397C is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.121 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.029 away. White text reads best on it, at 10.97:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.91:1 |
| White text | 10.97:1 |
Values
| HEX | #17397C |
| RGB | rgb(23, 57, 124) |
| HSL | hsl(220, 69%, 29%) |
| OKLCH | oklch(36.2% 0.121 262) |
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 #17397C | 10.97:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #17397C | 1.91:1 | Fails | Lc 8.9 | Not readable |
| #17397C text on white | 10.97:1 | AAA | Lc 95.0 | Preferred for body text |
| #17397C text on black | 1.91:1 | Fails | Lc -7.7 | 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 900.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFB
oklch(88.5% 0.05 261.5)
-
Step 300
300
#A1C1FC
oklch(80.9% 0.091 262.4)
-
Step 400
400
#6E9FFA
oklch(70.8% 0.144 261.9)
-
Step 500
500
#4783F8
oklch(63.1% 0.186 262.1)
-
Step 600
600
#2A69E7
oklch(55.6% 0.202 262.1)
-
Step 700
700
#1D57C9
oklch(49.2% 0.187 262)
-
Step 800
800
#1A48A2
oklch(42.8% 0.154 261.9)
-
Step 900
900 (this color)
#17397C
oklch(36.2% 0.121 262)
-
Step 950
950
#10244B
oklch(26.8% 0.077 262.1)
#17397C 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) | #0A417E | 0.022 |
| Deuteranopia (no green cones) | #00387B | 0.015 |
| Tritanopia (no blue cones) | #004954 | 0.094 |
| Achromatopsia (no color) | #3C3C3C | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17397C
#17397C
oklch(36.2% 0.121 262)
- #513900
#513900
oklch(36.2% 0.075 82.1)
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 #17397C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.029
- Marine Blue #01386A ΔE 0.035
- Cobalt #1E488F ΔE 0.052
- Marine #042E60 ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.064
- Light Navy #155084 ΔE 0.067
- Dark Slate Blue #483D8B ΔE 0.073
- Deep Sea Blue #015482 ΔE 0.078
Use #17397C 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.