#00213F
Closest named color: Oxford Blue (#1B263B). oklch(24.4% 0.069 249.8), rgb(0, 33, 63).
Aa
White text reads best on this color (16.28:1).
About this color
#00213F is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.069 and its hue 250°. 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 16.28:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.28:1 |
Values
| HEX | #00213F |
| RGB | rgb(0, 33, 63) |
| HSL | hsl(209, 100%, 12%) |
| OKLCH | oklch(24.4% 0.069 249.8) |
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 #00213F | 16.28:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #00213F | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #00213F text on white | 16.28:1 | AAA | Lc 102.9 | Preferred for body text |
| #00213F 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C3DCF6
oklch(88.4% 0.045 249.4)
-
Step 300
300
#99C5F4
oklch(80.9% 0.082 250.5)
-
Step 400
400
#5CA6EE
oklch(70.8% 0.129 249.5)
-
Step 500
500
#1E8DE9
oklch(63.2% 0.167 249.8)
-
Step 600
600
#0076CA
oklch(55.7% 0.156 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#004377
oklch(37.7% 0.106 249.9)
-
Step 950
950 (this color)
#00213F
oklch(24.4% 0.069 249.8)
#00213F 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) | #122340 | 0.021 |
| Deuteranopia (no green cones) | #061D3E | 0.013 |
| Tritanopia (no blue cones) | #00282C | 0.049 |
| Achromatopsia (no color) | #202020 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00213F
#00213F
oklch(24.4% 0.069 249.8)
- #301B00
#301B00
oklch(24.4% 0.053 70.1)
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 #00213F, 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 0.042
- Dark #1B2431 ΔE 0.044
- Navy Blue #001146 ΔE 0.051
- Jet #212529 ΔE 0.062
- Marine #042E60 ΔE 0.071
- Space Cadet #2B2D42 ΔE 0.073
- Dark Indigo #1F0954 ΔE 0.078
Use #00213F 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.