#00213D
Closest named color: Oxford Blue (#1B263B). oklch(24.2% 0.066 248.2), rgb(0, 33, 61).
Aa
White text reads best on this color (16.34:1).
About this color
#00213D is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.066 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.038 away. White text reads best on it, at 16.34:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.34:1 |
Values
| HEX | #00213D |
| RGB | rgb(0, 33, 61) |
| HSL | hsl(208, 100%, 12%) |
| OKLCH | oklch(24.2% 0.066 248.2) |
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 #00213D | 16.34:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #00213D | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #00213D text on white | 16.34:1 | AAA | Lc 103.0 | Preferred for body text |
| #00213D text on black | 1.28:1 | 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
#DFECF9
oklch(93.7% 0.022 248.1)
-
Step 200
200
#C4DCF5
oklch(88.5% 0.043 249.4)
-
Step 300
300
#99C6F1
oklch(81% 0.078 247.6)
-
Step 400
400
#5DA6EA
oklch(70.6% 0.124 248.4)
-
Step 500
500
#208EE4
oklch(63.1% 0.159 248.3)
-
Step 600
600
#0077C6
oklch(55.6% 0.15 248.2)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#004474
oklch(37.7% 0.101 247.8)
-
Step 950
950 (this color)
#00213D
oklch(24.2% 0.066 248.2)
#00213D 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) | #13233E | 0.022 |
| Deuteranopia (no green cones) | #081D3C | 0.014 |
| Tritanopia (no blue cones) | #00282C | 0.046 |
| Achromatopsia (no color) | #202020 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00213D
#00213D
oklch(24.2% 0.066 248.2)
- #301A00
#301A00
oklch(24.2% 0.053 67.9)
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 #00213D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.038
- Rich Black #0D1B2A ΔE 0.039
- Dark #1B2431 ΔE 0.041
- Navy Blue #001146 ΔE 0.053
- Jet #212529 ΔE 0.060
- Space Cadet #2B2D42 ΔE 0.074
- Marine #042E60 ΔE 0.074
- Night Blue #040348 ΔE 0.081
Use #00213D 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.