#25539F
Closest named color: Dusk Blue (#26538D). oklch(45.3% 0.134 259.9), rgb(37, 83, 159).
Aa
White text reads best on this color (7.45:1).
About this color
#25539F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.134 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.030 away. White text reads best on it, at 7.45:1.
| Hue family | Blues |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.81:1 |
| White text | 7.45:1 |
Values
| HEX | #25539F |
| RGB | rgb(37, 83, 159) |
| HSL | hsl(217, 62%, 38%) |
| OKLCH | oklch(45.3% 0.134 259.9) |
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 #25539F | 7.45:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #25539F | 2.81:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #25539F text on white | 7.45:1 | AAA | Lc 85.5 | Fine for body text |
| #25539F text on black | 2.81:1 | Fails | Lc -16.5 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A3C2F4
oklch(80.9% 0.079 259.9)
-
Step 400
400
#72A1EE
oklch(70.8% 0.124 259.9)
-
Step 500
500
#4C87E8
oklch(63.1% 0.159 259.8)
-
Step 600
600
#2F6ED7
oklch(55.6% 0.174 260.1)
-
Step 700
700
#225BBA
oklch(49% 0.162 260.2)
-
Step 800
800 (this color)
#25539F
oklch(45.3% 0.134 259.9)
-
Step 900
900
#1E4078
oklch(37.8% 0.104 259.9)
-
Step 950
950
#122646
oklch(27.1% 0.065 259.4)
#25539F 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) | #2A5BA2 | 0.024 |
| Deuteranopia (no green cones) | #07509D | 0.020 |
| Tritanopia (no blue cones) | #006571 | 0.104 |
| Achromatopsia (no color) | #555555 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #25539F
#25539F
oklch(45.3% 0.134 259.9)
- #714F00
#714F00
oklch(45.3% 0.094 80)
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 #25539F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.030
- Cobalt #1E488F ΔE 0.040
- Denim Blue #3B5B92 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.047
- Light Navy #155084 ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.054
- Twilight #4E518B ΔE 0.056
- Blueberry #464196 ΔE 0.057
Use #25539F 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.