#304E91
Closest named color: Dusk Blue (#26538D). oklch(43.7% 0.116 264.1), rgb(48, 78, 145).
Aa
White text reads best on this color (8.00:1).
About this color
#304E91 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.116 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.018 away. White text reads best on it, at 8.00:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.62:1 |
| White text | 8.00:1 |
Values
| HEX | #304E91 |
| RGB | rgb(48, 78, 145) |
| HSL | hsl(221, 50%, 38%) |
| OKLCH | oklch(43.7% 0.116 264.1) |
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 #304E91 | 8.00:1 | AAA | Lc -92.2 | Preferred for body text |
| Black text on #304E91 | 2.62:1 | Fails | Lc 16.5 | Dividers and decoration only |
| #304E91 text on white | 8.00:1 | AAA | Lc 87.5 | Fine for body text |
| #304E91 text on black | 2.62:1 | Fails | Lc -14.7 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDDAF3
oklch(88.6% 0.037 263.6)
-
Step 300
300
#ABC1ED
oklch(80.9% 0.067 264.1)
-
Step 400
400
#7E9FE5
oklch(70.6% 0.11 264.5)
-
Step 500
500
#5E86DD
oklch(63.1% 0.139 264.2)
-
Step 600
600
#456ECB
oklch(55.6% 0.151 264.2)
-
Step 700
700
#375BAF
oklch(49% 0.14 264.4)
-
Step 800
800 (this color)
#304E91
oklch(43.7% 0.116 264.1)
-
Step 900
900
#283F71
oklch(37.6% 0.091 264)
-
Step 950
950
#182542
oklch(26.9% 0.057 264.6)
#304E91 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) | #2D5594 | 0.019 |
| Deuteranopia (no green cones) | #1C4C90 | 0.020 |
| Tritanopia (no blue cones) | #005D68 | 0.096 |
| Achromatopsia (no color) | #505050 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304E91
#304E91
oklch(43.7% 0.116 264.1)
- #694D00
#694D00
oklch(43.8% 0.09 84.4)
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 #304E91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.018
- Cobalt #1E488F ΔE 0.027
- Light Navy #155084 ΔE 0.033
- Light Navy Blue #2E5A88 ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.041
- Twilight #4E518B ΔE 0.043
- Blueberry #464196 ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.044
Use #304E91 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.