#25509E
Closest named color: Dusk Blue (#26538D). oklch(44.6% 0.136 261.1), rgb(37, 80, 158).
Aa
White text reads best on this color (7.72:1).
About this color
#25509E is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.136 and its hue 261°. 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 7.72:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.71:1 |
| White text | 7.72:1 |
Values
| HEX | #25509E |
| RGB | rgb(37, 80, 158) |
| HSL | hsl(219, 62%, 38%) |
| OKLCH | oklch(44.6% 0.136 261.1) |
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 #25509E | 7.72:1 | AAA | Lc -91.2 | Preferred for body text |
| Black text on #25509E | 2.71:1 | Fails | Lc 17.6 | Dividers and decoration only |
| #25509E text on white | 7.72:1 | AAA | Lc 86.4 | Fine for body text |
| #25509E text on black | 2.71:1 | Fails | Lc -15.7 | 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
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF7
oklch(88.5% 0.044 261.2)
-
Step 300
300
#A4C2F5
oklch(81% 0.08 260.9)
-
Step 400
400
#73A0EF
oklch(70.7% 0.126 261.1)
-
Step 500
500
#4E86EA
oklch(63.1% 0.162 261)
-
Step 600
600
#326DD9
oklch(55.6% 0.177 261.2)
-
Step 700
700
#255ABC
oklch(49% 0.165 261.3)
-
Step 800
800 (this color)
#25509E
oklch(44.6% 0.136 261.1)
-
Step 900
900
#1F3F79
oklch(37.7% 0.106 261.2)
-
Step 950
950
#132547
oklch(26.9% 0.068 261.9)
#25509E 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) | #2359A1 | 0.025 |
| Deuteranopia (no green cones) | #004E9C | 0.022 |
| Tritanopia (no blue cones) | #00636F | 0.108 |
| Achromatopsia (no color) | #535353 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #25509E
#25509E
oklch(44.6% 0.136 261.1)
- #6E4E00
#6E4E00
oklch(44.7% 0.092 81.3)
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 #25509E, 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 0.033
- Light Navy #155084 ΔE 0.046
- Denim Blue #3B5B92 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.051
- Blueberry #464196 ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.054
- Twilight #4E518B ΔE 0.058
Use #25509E 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.