#004678
Closest named color: Twilight Blue (#0A437A). oklch(38.5% 0.104 248.2), rgb(0, 70, 120).
Aa
White text reads best on this color (9.77:1).
About this color
#004678 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.104 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.010 away. White text reads best on it, at 9.77:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.14:1 |
| White text | 9.77:1 |
Values
| HEX | #004678 |
| RGB | rgb(0, 70, 120) |
| HSL | hsl(205, 100%, 24%) |
| OKLCH | oklch(38.5% 0.104 248.2) |
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 #004678 | 9.77:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #004678 | 2.14:1 | Fails | Lc 11.9 | Not readable |
| #004678 text on white | 9.77:1 | AAA | Lc 92.1 | Preferred for body text |
| #004678 text on black | 2.14:1 | Fails | Lc -10.3 | 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 900.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF9
oklch(93.7% 0.022 248.1)
-
Step 200
200
#C3DCF5
oklch(88.4% 0.044 248.3)
-
Step 300
300
#99C6F1
oklch(81% 0.078 247.6)
-
Step 400
400
#5CA6EB
oklch(70.7% 0.126 248.5)
-
Step 500
500
#1E8EE4
oklch(63.1% 0.16 248.1)
-
Step 600
600
#0077C6
oklch(55.6% 0.15 248.2)
-
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 (this color)
#004678
oklch(38.5% 0.104 248.2)
-
Step 950
950
#052845
oklch(27% 0.066 248.3)
#004678 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) | #2D497A | 0.035 |
| Deuteranopia (no green cones) | #193F77 | 0.022 |
| Tritanopia (no blue cones) | #005259 | 0.074 |
| Achromatopsia (no color) | #444444 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #004678
#004678
oklch(38.5% 0.104 248.2)
- #613A00
#613A00
oklch(38.7% 0.085 68.3)
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 #004678, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.010
- Light Navy #155084 ΔE 0.037
- Cobalt #1E488F ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.044
- Marine Blue #01386A ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.055
- Dusk Blue #26538D ΔE 0.058
- Charcoal #264653 ΔE 0.066
Use #004678 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.