#17358A
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.146 265), rgb(23, 53, 138).
Aa
White text reads best on this color (10.97:1).
About this color
#17358A is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.146 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.049 away. White text reads best on it, at 10.97:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.91:1 |
| White text | 10.97:1 |
Values
| HEX | #17358A |
| RGB | rgb(23, 53, 138) |
| HSL | hsl(224, 71%, 32%) |
| OKLCH | oklch(36.6% 0.146 265) |
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 #17358A | 10.97:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #17358A | 1.91:1 | Fails | Lc 9.1 | Not readable |
| #17358A text on white | 10.97:1 | AAA | Lc 94.8 | Preferred for body text |
| #17358A text on black | 1.91:1 | Fails | Lc -7.8 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#719CFF
oklch(70.6% 0.153 265)
-
Step 500
500
#4D80FF
oklch(63.2% 0.197 264.8)
-
Step 600
600
#2A5FFF
oklch(55.7% 0.244 264.9)
-
Step 700
700
#1E4CDE
oklch(49.1% 0.227 264.9)
-
Step 800
800
#1A40B3
oklch(42.7% 0.187 264.9)
-
Step 900
900 (this color)
#17358A
oklch(36.6% 0.146 265)
-
Step 950
950
#0F2253
oklch(27% 0.093 264.8)
#17358A 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) | #00428D | 0.034 |
| Deuteranopia (no green cones) | #003788 | 0.014 |
| Tritanopia (no blue cones) | #004B5A | 0.114 |
| Achromatopsia (no color) | #3C3C3C | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17358A
#17358A
oklch(36.6% 0.146 265)
- #513B00
#513B00
oklch(36.7% 0.075 84.9)
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 #17358A, closest first.
No curated palette has a color within ΔE 0.04 of #17358A.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.049
- Cobalt #1E488F ΔE 0.053
- Sapphire #2138AB ΔE 0.057
- Marine Blue #01386A ΔE 0.058
- Royal #0C1793 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.072
- Blueberry #464196 ΔE 0.076
- Marine #042E60 ΔE 0.077
Use #17358A 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.