#303D53
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.8% 0.042 260.7), rgb(48, 61, 83).
Aa
White text reads best on this color (10.94:1).
About this color
#303D53 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.042 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.026 away. White text reads best on it, at 10.94:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.91:1 |
| White text | 10.94:1 |
Values
| HEX | #303D53 |
| RGB | rgb(48, 61, 83) |
| HSL | hsl(218, 27%, 26%) |
| OKLCH | oklch(35.8% 0.042 260.7) |
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 #303D53 | 10.94:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #303D53 | 1.91:1 | Fails | Lc 8.6 | Not readable |
| #303D53 text on white | 10.94:1 | AAA | Lc 95.3 | Preferred for body text |
| #303D53 text on black | 1.91:1 | Fails | Lc -7.3 | 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
#D3DAE5
oklch(88.6% 0.017 259.4)
-
Step 300
300
#B5C1D6
oklch(80.8% 0.032 261.7)
-
Step 400
400
#8FA2C1
oklch(70.8% 0.05 260.2)
-
Step 500
500
#738AB1
oklch(63% 0.065 260.8)
-
Step 600
600
#5C749D
oklch(55.7% 0.07 260.9)
-
Step 700
700
#4B6186
oklch(49.1% 0.066 260.6)
-
Step 800
800
#3E4F6D
oklch(42.6% 0.055 261.5)
-
Step 900
900 (this color)
#303D53
oklch(35.8% 0.042 260.7)
-
Step 950
950
#1F2734
oklch(27.1% 0.027 260)
#303D53 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) | #353E54 | 0.009 |
| Deuteranopia (no green cones) | #313B53 | 0.006 |
| Tritanopia (no blue cones) | #244245 | 0.038 |
| Achromatopsia (no color) | #3C3C3C | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303D53
#303D53
oklch(35.8% 0.042 260.7)
- #483A22
#483A22
oklch(35.7% 0.042 80.2)
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 #303D53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.029
- Charcoal #264653 ΔE 0.031
- Onyx #343A40 ΔE 0.032
- Charcoal Grey #3C4142 ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.040
- Gunmetal #293241 ΔE 0.045
- Midnight Green #073B4C ΔE 0.045
Use #303D53 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.