#00233F
Closest named color: Oxford Blue (#1B263B). oklch(24.9% 0.066 247.3), rgb(0, 35, 63).
Aa
White text reads best on this color (16.00:1).
About this color
#00233F is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.066 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.034 away. White text reads best on it, at 16.00:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.31:1 |
| White text | 16.00:1 |
Values
| HEX | #00233F |
| RGB | rgb(0, 35, 63) |
| HSL | hsl(207, 100%, 12%) |
| OKLCH | oklch(24.9% 0.066 247.3) |
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 #00233F | 16.00:1 | AAA | Lc -105.3 | Preferred for body text |
| Black text on #00233F | 1.31:1 | Fails | Lc 0.0 | Not readable |
| #00233F text on white | 16.00:1 | AAA | Lc 102.6 | Preferred for body text |
| #00233F text on black | 1.31:1 | 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
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C3DCF5
oklch(88.4% 0.044 248.3)
-
Step 300
300
#98C6F1
oklch(80.9% 0.078 247.1)
-
Step 400
400
#5AA7EA
oklch(70.7% 0.125 246.9)
-
Step 500
500
#188FE4
oklch(63.2% 0.16 247.2)
-
Step 600
600
#0078C4
oklch(55.7% 0.147 247.1)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#005289
oklch(42.7% 0.113 247.3)
-
Step 900
900
#004473
oklch(37.7% 0.1 247.4)
-
Step 950
950 (this color)
#00233F
oklch(24.9% 0.066 247.3)
#00233F 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) | #152540 | 0.024 |
| Deuteranopia (no green cones) | #0A1F3E | 0.015 |
| Tritanopia (no blue cones) | #002A2D | 0.048 |
| Achromatopsia (no color) | #222222 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00233F
#00233F
oklch(24.9% 0.066 247.3)
- #331B00
#331B00
oklch(24.9% 0.056 65.9)
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 #00233F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.034
- Dark #1B2431 ΔE 0.040
- Rich Black #0D1B2A ΔE 0.044
- Navy Blue #001146 ΔE 0.058
- Jet #212529 ΔE 0.058
- Marine #042E60 ΔE 0.068
- Space Cadet #2B2D42 ΔE 0.068
- Gunmetal #293241 ΔE 0.076
Use #00233F 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.