#00203B
Closest named color: Rich Black (#0D1B2A). oklch(23.8% 0.064 247.9), rgb(0, 32, 59).
Aa
White text reads best on this color (16.53:1).
About this color
#00203B is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.064 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.035 away. White text reads best on it, at 16.53:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.26:1 |
| White text | 16.53:1 |
Values
| HEX | #00203B |
| RGB | rgb(0, 32, 59) |
| HSL | hsl(207, 100%, 12%) |
| OKLCH | oklch(23.8% 0.064 247.9) |
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 #00203B | 16.53:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #00203B | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #00203B text on white | 16.53:1 | AAA | Lc 103.2 | Preferred for body text |
| #00203B text on black | 1.26:1 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C4DCF4
oklch(88.4% 0.042 248.3)
-
Step 300
300
#9AC6F0
oklch(81% 0.076 247.6)
-
Step 400
400
#5FA6E8
oklch(70.6% 0.121 248.3)
-
Step 500
500
#258EE1
oklch(63% 0.155 248)
-
Step 600
600
#0077C5
oklch(55.6% 0.149 247.9)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#014474
oklch(37.7% 0.101 248)
-
Step 950
950 (this color)
#00203B
oklch(23.8% 0.064 247.9)
#00203B 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) | #12223C | 0.022 |
| Deuteranopia (no green cones) | #081C3A | 0.014 |
| Tritanopia (no blue cones) | #00272A | 0.047 |
| Achromatopsia (no color) | #1F1F1F | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00203B
#00203B
oklch(23.8% 0.064 247.9)
- #2F1900
#2F1900
oklch(23.8% 0.053 67.1)
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 #00203B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.035
- Oxford Blue #1B263B ΔE 0.040
- Dark #1B2431 ΔE 0.042
- Navy Blue #001146 ΔE 0.051
- Jet #212529 ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.077
- Rich Navy #001219 ΔE 0.078
- Marine #042E60 ΔE 0.079
Use #00203B 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.