#303E54
Closest named color: Dark Grey Blue (#29465B). oklch(36.1% 0.043 259.3), rgb(48, 62, 84).
Aa
White text reads best on this color (10.80:1).
About this color
#303E54 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.043 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.025 away. White text reads best on it, at 10.80:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #303E54 |
| RGB | rgb(48, 62, 84) |
| HSL | hsl(217, 27%, 26%) |
| OKLCH | oklch(36.1% 0.043 259.3) |
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 #303E54 | 10.80:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #303E54 | 1.94:1 | Fails | Lc 8.9 | Not readable |
| #303E54 text on white | 10.80:1 | AAA | Lc 95.0 | Preferred for body text |
| #303E54 text on black | 1.94:1 | 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
#B5C2D6
oklch(81% 0.032 258.9)
-
Step 400
400
#8EA2C1
oklch(70.8% 0.051 259.1)
-
Step 500
500
#728BB1
oklch(63.2% 0.064 258.6)
-
Step 600
600
#5A749D
oklch(55.5% 0.071 259.3)
-
Step 700
700
#4A6186
oklch(49% 0.066 259.7)
-
Step 800
800
#3D506D
oklch(42.8% 0.054 258.7)
-
Step 900
900 (this color)
#303E54
oklch(36.1% 0.043 259.3)
-
Step 950
950
#1F2734
oklch(27.1% 0.027 260)
#303E54 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) | #363F55 | 0.010 |
| Deuteranopia (no green cones) | #323C54 | 0.007 |
| Tritanopia (no blue cones) | #244346 | 0.038 |
| Achromatopsia (no color) | #3D3D3D | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303E54
#303E54
oklch(36.1% 0.043 259.3)
- #493B23
#493B23
oklch(36.1% 0.042 80.3)
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 #303E54, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.028
- Charcoal #264653 ΔE 0.028
- Onyx #343A40 ΔE 0.034
- Charcoal Grey #3C4142 ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.042
- Midnight Green #073B4C ΔE 0.046
- Gunmetal #293241 ΔE 0.048
Use #303E54 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.