#305B91
Closest named color: Denim Blue (#3B5B92). oklch(46.7% 0.1 255.1), rgb(48, 91, 145).
Aa
White text reads best on this color (6.92:1).
About this color
#305B91 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.100 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.012 away. White text reads best on it, at 6.92:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.03:1 |
| White text | 6.92:1 |
Values
| HEX | #305B91 |
| RGB | rgb(48, 91, 145) |
| HSL | hsl(213, 50%, 38%) |
| OKLCH | oklch(46.7% 0.1 255.1) |
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 #305B91 | 6.92:1 | AA | Lc -88.7 | Fine for body text |
| Black text on #305B91 | 3.03:1 | AA large text | Lc 20.3 | Dividers and decoration only |
| #305B91 text on white | 6.92:1 | AA | Lc 83.7 | Fine for body text |
| #305B91 text on black | 3.03:1 | AA large text | Lc -18.2 | 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 700.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEB
oklch(88.4% 0.027 257)
-
Step 300
300
#ACC3E0
oklch(80.9% 0.048 254.3)
-
Step 400
400
#80A3D1
oklch(70.7% 0.078 255.5)
-
Step 500
500
#5F8CC5
oklch(63.2% 0.1 254.9)
-
Step 600
600
#4575B1
oklch(55.6% 0.108 254.8)
-
Step 700
700 (this color)
#305B91
oklch(46.7% 0.1 255.1)
-
Step 800
800
#2E507C
oklch(42.7% 0.084 255.5)
-
Step 900
900
#294363
oklch(37.8% 0.064 254.3)
-
Step 950
950
#18273A
oklch(26.9% 0.041 254.8)
#305B91 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) | #435F93 | 0.026 |
| Deuteranopia (no green cones) | #365690 | 0.015 |
| Tritanopia (no blue cones) | #00676F | 0.080 |
| Achromatopsia (no color) | #5A5A5A | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #305B91
#305B91
oklch(46.7% 0.1 255.1)
- #7A5100
#7A5100
oklch(46.9% 0.099 75.3)
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 #305B91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.012
- Light Navy Blue #2E5A88 ΔE 0.015
- Dusk Blue #26538D ΔE 0.027
- Dusky Blue #475F94 ΔE 0.030
- Denim #3B638C ΔE 0.030
- Peacock Blue #016795 ΔE 0.038
- Twilight #4E518B ΔE 0.043
- Dusk #4E5481 ΔE 0.043
Use #305B91 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.