#02578C
Closest named color: Deep Sea Blue (#015482). oklch(44.2% 0.111 245.5), rgb(2, 87, 140).
Aa
White text reads best on this color (7.65:1).
About this color
#02578C is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.111 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.018 away. White text reads best on it, at 7.65:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.74:1 |
| White text | 7.65:1 |
Values
| HEX | #02578C |
| RGB | rgb(2, 87, 140) |
| HSL | hsl(203, 97%, 28%) |
| OKLCH | oklch(44.2% 0.111 245.5) |
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 #02578C | 7.65:1 | AAA | Lc -90.8 | Preferred for body text |
| Black text on #02578C | 2.74:1 | Fails | Lc 18.0 | Dividers and decoration only |
| #02578C text on white | 7.65:1 | AAA | Lc 86.0 | Fine for body text |
| #02578C text on black | 2.74:1 | Fails | Lc -16.1 | Dividers and decoration only |
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 800.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF6
oklch(93.5% 0.019 248)
-
Step 200
200
#C6DCF0
oklch(88.4% 0.036 245.7)
-
Step 300
300
#9EC6E9
oklch(81% 0.065 245.1)
-
Step 400
400
#66A7DD
oklch(70.7% 0.104 245.1)
-
Step 500
500
#3690D4
oklch(63.1% 0.133 245.2)
-
Step 600
600
#0079C0
oklch(55.7% 0.141 245.3)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800 (this color)
#02578C
oklch(44.2% 0.111 245.5)
-
Step 900
900
#0E456C
oklch(37.7% 0.086 245.2)
-
Step 950
950
#0B293F
oklch(27.1% 0.054 244.1)
#02578C 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) | #3D598E | 0.043 |
| Deuteranopia (no green cones) | #294E8B | 0.030 |
| Tritanopia (no blue cones) | #00646B | 0.077 |
| Achromatopsia (no color) | #535353 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #02578C
#02578C
oklch(44.2% 0.111 245.5)
- #774600
#774600
oklch(44.2% 0.098 66)
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 #02578C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.018
- Dusk Blue #26538D ΔE 0.020
- Light Navy #155084 ΔE 0.022
- Light Navy Blue #2E5A88 ΔE 0.029
- Denim Blue #3B5B92 ΔE 0.044
- Cobalt #1E488F ΔE 0.044
- Peacock Blue #016795 ΔE 0.048
- Denim #3B638C ΔE 0.057
Use #02578C 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.