#25437B
Closest named color: Twilight Blue (#0A437A). oklch(39.1% 0.102 261.7), rgb(37, 67, 123).
Aa
White text reads best on this color (9.68:1).
About this color
#25437B is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.102 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.020 away. White text reads best on it, at 9.68:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.16:1 |
| White text | 9.68:1 |
Values
| HEX | #25437B |
| RGB | rgb(37, 67, 123) |
| HSL | hsl(219, 54%, 31%) |
| OKLCH | oklch(39.1% 0.102 261.7) |
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 #25437B | 9.68:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #25437B | 2.16:1 | Fails | Lc 11.8 | Not readable |
| #25437B text on white | 9.68:1 | AAA | Lc 92.2 | Preferred for body text |
| #25437B text on black | 2.16:1 | Fails | Lc -10.2 | 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 900.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF6
oklch(88.5% 0.042 261.7)
-
Step 300
300
#A6C1F3
oklch(80.8% 0.077 262.6)
-
Step 400
400
#76A0ED
oklch(70.7% 0.122 261.9)
-
Step 500
500
#5286E7
oklch(63.1% 0.157 261.7)
-
Step 600
600
#376ED5
oklch(55.7% 0.169 261.5)
-
Step 700
700
#2A5BB8
oklch(49.1% 0.157 261.7)
-
Step 800
800
#234B95
oklch(42.7% 0.13 261.4)
-
Step 900
900 (this color)
#25437B
oklch(39.1% 0.102 261.7)
-
Step 950
950
#142546
oklch(26.9% 0.066 262.3)
#25437B 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) | #28497D | 0.019 |
| Deuteranopia (no green cones) | #19417A | 0.014 |
| Tritanopia (no blue cones) | #005059 | 0.083 |
| Achromatopsia (no color) | #444444 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #25437B
#25437B
oklch(39.1% 0.102 261.7)
- #5B4000
#5B4000
oklch(39.1% 0.081 81.5)
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 #25437B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.020
- Cobalt #1E488F ΔE 0.034
- Light Navy #155084 ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.050
- Dusk Blue #26538D ΔE 0.052
- Marine Blue #01386A ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.058
- Dark Grey Blue #29465B ΔE 0.058
Use #25437B 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.