#17183F
Closest named color: Navy Blue (#001146). oklch(23.4% 0.073 278.1), rgb(23, 24, 63).
Aa
White text reads best on this color (16.95:1).
About this color
#17183F is a very dark, moderately saturated blue. In OKLCH its lightness is 23%, its chroma 0.073 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.044 away. White text reads best on it, at 16.95:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.23:1 |
| White text | 16.95:1 |
Values
| HEX | #17183F |
| RGB | rgb(23, 24, 63) |
| HSL | hsl(239, 47%, 17%) |
| OKLCH | oklch(23.4% 0.073 278.1) |
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 #17183F | 16.95:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #17183F | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #17183F text on white | 16.95:1 | AAA | Lc 103.7 | Preferred for body text |
| #17183F text on black | 1.23:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D1D7F9
oklch(88.5% 0.047 277.5)
-
Step 300
300
#B3BCF8
oklch(80.9% 0.085 277.7)
-
Step 400
400
#8D96F5
oklch(70.6% 0.138 278.1)
-
Step 500
500
#7479F1
oklch(63.1% 0.176 278.3)
-
Step 600
600
#5E5FE0
oklch(55.7% 0.192 277.8)
-
Step 700
700
#4E4DC2
oklch(49.1% 0.178 278)
-
Step 800
800
#40409D
oklch(42.7% 0.147 278.2)
-
Step 900
900
#35377D
oklch(37.6% 0.116 278)
-
Step 950
950 (this color)
#17183F
oklch(23.4% 0.073 278.1)
#17183F 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) | #021E40 | 0.029 |
| Deuteranopia (no green cones) | #001B3E | 0.030 |
| Tritanopia (no blue cones) | #042128 | 0.064 |
| Achromatopsia (no color) | #1C1C1C | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17183F
#17183F
oklch(23.4% 0.073 278.1)
- #241E00
#241E00
oklch(23.5% 0.049 98.6)
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 #17183F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.044
- Rich Black #0D1B2A ΔE 0.047
- Oxford Blue #1B263B ΔE 0.049
- Dark Indigo #1F0954 ΔE 0.051
- Dark #1B2431 ΔE 0.053
- Midnight Purple #280137 ΔE 0.065
- Night Blue #040348 ΔE 0.066
- Very Dark Purple #2A0134 ΔE 0.069
Use #17183F 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.