#15173F
Closest named color: Navy Blue (#001146). oklch(23% 0.075 276.6), rgb(21, 23, 63).
Aa
White text reads best on this color (17.12:1).
About this color
#15173F is a very dark, moderately saturated blue. In OKLCH its lightness is 23%, its chroma 0.075 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.040 away. White text reads best on it, at 17.12:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.22:1 |
| White text | 17.12:1 |
Values
| HEX | #15173F |
| RGB | rgb(21, 23, 63) |
| HSL | hsl(237, 50%, 16%) |
| OKLCH | oklch(23% 0.075 276.6) |
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 #15173F | 17.12:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #15173F | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #15173F text on white | 17.12:1 | AAA | Lc 103.8 | Preferred for body text |
| #15173F text on black | 1.22:1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D0D7FA
oklch(88.5% 0.049 276.4)
-
Step 300
300
#B1BCFA
oklch(80.9% 0.089 276.4)
-
Step 400
400
#8A97F8
oklch(70.8% 0.142 276.4)
-
Step 500
500
#7079F4
oklch(63% 0.181 276.7)
-
Step 600
600
#5B5EE3
oklch(55.5% 0.197 276.9)
-
Step 700
700
#4B4DC5
oklch(49.1% 0.183 276.6)
-
Step 800
800
#3D40A0
oklch(42.8% 0.152 276.5)
-
Step 900
900
#33377F
oklch(37.6% 0.12 276.6)
-
Step 950
950 (this color)
#15173F
oklch(23% 0.075 276.6)
#15173F 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) | #001D40 | 0.029 |
| Deuteranopia (no green cones) | #001A3E | 0.028 |
| Tritanopia (no blue cones) | #002028 | 0.064 |
| Achromatopsia (no color) | #1C1C1C | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #15173F
#15173F
oklch(23% 0.075 276.6)
- #231D00
#231D00
oklch(23.1% 0.048 98.3)
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 #15173F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.040
- Rich Black #0D1B2A ΔE 0.047
- Dark Indigo #1F0954 ΔE 0.050
- Oxford Blue #1B263B ΔE 0.053
- Dark #1B2431 ΔE 0.057
- Night Blue #040348 ΔE 0.061
- Midnight Purple #280137 ΔE 0.065
- Very Dark Purple #2A0134 ΔE 0.069
Use #15173F 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.