#303D55
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.9% 0.045 262.3), rgb(48, 61, 85).
Aa
White text reads best on this color (10.91:1).
About this color
#303D55 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.045 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.028 away. White text reads best on it, at 10.91:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.92:1 |
| White text | 10.91:1 |
Values
| HEX | #303D55 |
| RGB | rgb(48, 61, 85) |
| HSL | hsl(219, 28%, 26%) |
| OKLCH | oklch(35.9% 0.045 262.3) |
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 #303D55 | 10.91:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #303D55 | 1.92:1 | Fails | Lc 8.7 | Not readable |
| #303D55 text on white | 10.91:1 | AAA | Lc 95.2 | Preferred for body text |
| #303D55 text on black | 1.92:1 | Fails | Lc -7.4 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D2D9E6
oklch(88.4% 0.019 263)
-
Step 300
300
#B5C1D7
oklch(80.9% 0.034 262.7)
-
Step 400
400
#8EA1C3
oklch(70.6% 0.054 262)
-
Step 500
500
#738AB4
oklch(63.2% 0.069 262.2)
-
Step 600
600
#5B73A0
oklch(55.5% 0.076 262.5)
-
Step 700
700
#4B6189
oklch(49.2% 0.07 261.9)
-
Step 800
800
#3E4F6F
oklch(42.7% 0.058 262.6)
-
Step 900
900 (this color)
#303D55
oklch(35.9% 0.045 262.3)
-
Step 950
950
#1F2735
oklch(27.2% 0.029 261.4)
#303D55 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) | #353F56 | 0.010 |
| Deuteranopia (no green cones) | #313B54 | 0.006 |
| Tritanopia (no blue cones) | #244245 | 0.041 |
| Achromatopsia (no color) | #3D3D3D | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303D55
#303D55
oklch(35.9% 0.045 262.3)
- #493B20
#493B20
oklch(36% 0.046 82.8)
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 #303D55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.028
- Dark Grey Blue #29465B ΔE 0.028
- Charcoal #264653 ΔE 0.032
- Onyx #343A40 ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.043
- Midnight Green #073B4C ΔE 0.046
- Gunmetal #293241 ΔE 0.047
Use #303D55 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.