#25478F
Closest named color: Cobalt (#1E488F). oklch(41.5% 0.126 263), rgb(37, 71, 143).
Aa
White text reads best on this color (8.83:1).
About this color
#25478F is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.126 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.006 away. White text reads best on it, at 8.83:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.37:1 |
| White text | 8.83:1 |
Values
| HEX | #25478F |
| RGB | rgb(37, 71, 143) |
| HSL | hsl(221, 59%, 35%) |
| OKLCH | oklch(41.5% 0.126 263) |
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 #25478F | 8.83:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #25478F | 2.37:1 | Fails | Lc 14.1 | Not readable |
| #25478F text on white | 8.83:1 | AAA | Lc 89.9 | Fine for body text |
| #25478F text on black | 2.37:1 | Fails | Lc -12.4 | 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 800.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A8C1F1
oklch(80.9% 0.074 263.3)
-
Step 400
400
#79A0EA
oklch(70.8% 0.117 262.5)
-
Step 500
500
#5886E4
oklch(63.2% 0.15 263.1)
-
Step 600
600
#3E6DD2
oklch(55.6% 0.164 263.3)
-
Step 700
700
#305BB6
oklch(49.2% 0.152 263)
-
Step 800
800 (this color)
#25478F
oklch(41.5% 0.126 263)
-
Step 900
900
#253F75
oklch(37.7% 0.098 263.2)
-
Step 950
950
#162545
oklch(27% 0.063 263.8)
#25478F 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) | #1E4F92 | 0.022 |
| Deuteranopia (no green cones) | #00468E | 0.023 |
| Tritanopia (no blue cones) | #005864 | 0.100 |
| Achromatopsia (no color) | #4A4A4A | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #25478F
#25478F
oklch(41.5% 0.126 263)
- #624600
#624600
oklch(41.4% 0.085 82.4)
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 #25478F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.006
- Light Navy #155084 ΔE 0.035
- Dusk Blue #26538D ΔE 0.035
- Twilight Blue #0A437A ΔE 0.043
- Blueberry #464196 ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.050
- Sapphire #2138AB ΔE 0.060
Use #25478F 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.