#303E53
Closest named color: Dark Grey Blue (#29465B). oklch(36.1% 0.041 258.3), rgb(48, 62, 83).
Aa
White text reads best on this color (10.82:1).
About this color
#303E53 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.041 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.026 away. White text reads best on it, at 10.82:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.93:1 |
| White text | 10.82:1 |
Values
| HEX | #303E53 |
| RGB | rgb(48, 62, 83) |
| HSL | hsl(216, 27%, 26%) |
| OKLCH | oklch(36.1% 0.041 258.3) |
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 #303E53 | 10.82:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #303E53 | 1.93:1 | Fails | Lc 8.8 | Not readable |
| #303E53 text on white | 10.82:1 | AAA | Lc 95.1 | Preferred for body text |
| #303E53 text on black | 1.93:1 | Fails | Lc -7.6 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D2DAE5
oklch(88.6% 0.017 256.3)
-
Step 300
300
#B5C2D5
oklch(81% 0.03 257.8)
-
Step 400
400
#8EA2C0
oklch(70.7% 0.05 258.4)
-
Step 500
500
#728BB0
oklch(63.1% 0.063 258.1)
-
Step 600
600
#5A749B
oklch(55.4% 0.068 258.3)
-
Step 700
700
#4A6285
oklch(49.2% 0.064 257.7)
-
Step 800
800
#3D506C
oklch(42.8% 0.053 257.9)
-
Step 900
900 (this color)
#303E53
oklch(36.1% 0.041 258.3)
-
Step 950
950
#1F2733
oklch(27.1% 0.025 258.3)
#303E53 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) | #363F54 | 0.010 |
| Deuteranopia (no green cones) | #333C53 | 0.007 |
| Tritanopia (no blue cones) | #244245 | 0.036 |
| Achromatopsia (no color) | #3D3D3D | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303E53
#303E53
oklch(36.1% 0.041 258.3)
- #493B24
#493B24
oklch(36.1% 0.041 79.3)
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 #303E53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.027
- Charcoal #264653 ΔE 0.028
- Onyx #343A40 ΔE 0.032
- Charcoal Grey #3C4142 ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.043
- Midnight Green #073B4C ΔE 0.046
- Gunmetal #293241 ΔE 0.047
Use #303E53 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.