#25559B
Closest named color: Dusk Blue (#26538D). oklch(45.5% 0.125 258.1), rgb(37, 85, 155).
Aa
White text reads best on this color (7.36:1).
About this color
#25559B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.125 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.023 away. White text reads best on it, at 7.36:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.85:1 |
| White text | 7.36:1 |
Values
| HEX | #25559B |
| RGB | rgb(37, 85, 155) |
| HSL | hsl(216, 61%, 38%) |
| OKLCH | oklch(45.5% 0.125 258.1) |
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 #25559B | 7.36:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #25559B | 2.85:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #25559B text on white | 7.36:1 | AAA | Lc 85.2 | Fine for body text |
| #25559B text on black | 2.85:1 | Fails | Lc -16.8 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C9DBF5
oklch(88.6% 0.041 257.5)
-
Step 300
300
#A4C3F0
oklch(81% 0.072 257.6)
-
Step 400
400
#72A2E9
oklch(70.7% 0.117 258)
-
Step 500
500
#4C89E3
oklch(63.2% 0.15 258.1)
-
Step 600
600
#2E70D0
oklch(55.5% 0.163 258.2)
-
Step 700
700
#205EB5
oklch(49.2% 0.152 258)
-
Step 800
800 (this color)
#25559B
oklch(45.5% 0.125 258.1)
-
Step 900
900
#1D4174
oklch(37.7% 0.097 257.5)
-
Step 950
950
#122644
oklch(26.9% 0.062 258.3)
#25559B 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) | #315C9E | 0.024 |
| Deuteranopia (no green cones) | #1A519A | 0.015 |
| Tritanopia (no blue cones) | #006570 | 0.097 |
| Achromatopsia (no color) | #565656 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #25559B
#25559B
oklch(45.5% 0.125 258.1)
- #734F00
#734F00
oklch(45.5% 0.095 78.4)
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 #25559B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.023
- Denim Blue #3B5B92 ΔE 0.034
- Light Navy Blue #2E5A88 ΔE 0.038
- Cobalt #1E488F ΔE 0.041
- Light Navy #155084 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.047
- Dusky Blue #475F94 ΔE 0.052
- Twilight #4E518B ΔE 0.052
Use #25559B 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.