#09172A
Closest named color: Rich Black (#0D1B2A). oklch(20.3% 0.043 256.5), rgb(9, 23, 42).
Aa
White text reads best on this color (17.98:1).
About this color
#09172A is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.043 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.016 away. White text reads best on it, at 17.98:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 17.98:1 |
Values
| HEX | #09172A |
| RGB | rgb(9, 23, 42) |
| HSL | hsl(215, 65%, 10%) |
| OKLCH | oklch(20.3% 0.043 256.5) |
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 #09172A | 17.98:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #09172A | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #09172A text on white | 17.98:1 | AAA | Lc 104.6 | Preferred for body text |
| #09172A text on black | 1.16:1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CDDAEC
oklch(88.4% 0.029 256.5)
-
Step 300
300
#ACC3E2
oklch(81% 0.051 255.9)
-
Step 400
400
#80A3D3
oklch(70.8% 0.081 256.4)
-
Step 500
500
#5F8BC8
oklch(63.1% 0.105 256.7)
-
Step 600
600
#4574B4
oklch(55.5% 0.113 256.5)
-
Step 700
700
#36619B
oklch(49% 0.105 256.4)
-
Step 800
800
#2E507E
oklch(42.8% 0.087 256.4)
-
Step 900
900
#294265
oklch(37.6% 0.068 257)
-
Step 950
950 (this color)
#09172A
oklch(20.3% 0.043 256.5)
#09172A 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) | #0F182B | 0.010 |
| Deuteranopia (no green cones) | #0A152A | 0.007 |
| Tritanopia (no blue cones) | #001B1E | 0.035 |
| Achromatopsia (no color) | #171717 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #09172A
#09172A
oklch(20.3% 0.043 256.5)
- #221400
#221400
oklch(20.5% 0.043 76.7)
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 #09172A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.016
- Rich Navy #001219 ΔE 0.042
- Dark #1B2431 ΔE 0.056
- Navy Blue #001146 ΔE 0.060
- Almost Black #070D0D ΔE 0.064
- Oxford Blue #1B263B ΔE 0.066
- Jet #212529 ΔE 0.068
- Dark Navy #000435 ΔE 0.069
Use #09172A 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.