#303D4E
Closest named color: Onyx (#343A40). oklch(35.6% 0.034 255.3), rgb(48, 61, 78).
Aa
White text reads best on this color (11.03:1).
About this color
#303D4E is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.034 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.024 away. White text reads best on it, at 11.03:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.90:1 |
| White text | 11.03:1 |
Values
| HEX | #303D4E |
| RGB | rgb(48, 61, 78) |
| HSL | hsl(214, 24%, 25%) |
| OKLCH | oklch(35.6% 0.034 255.3) |
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 #303D4E | 11.03:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #303D4E | 1.90:1 | Fails | Lc 8.4 | Not readable |
| #303D4E text on white | 11.03:1 | AAA | Lc 95.5 | Preferred for body text |
| #303D4E text on black | 1.90:1 | Fails | Lc 0.0 | 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
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D3DAE3
oklch(88.6% 0.015 254.6)
-
Step 300
300
#B6C2D1
oklch(80.9% 0.025 254)
-
Step 400
400
#90A2BB
oklch(70.7% 0.042 256.6)
-
Step 500
500
#748BA9
oklch(63% 0.053 255.2)
-
Step 600
600
#5D7595
oklch(55.6% 0.058 255.8)
-
Step 700
700
#4C627F
oklch(49% 0.054 255.5)
-
Step 800
800
#3F5067
oklch(42.7% 0.044 256.1)
-
Step 900
900 (this color)
#303D4E
oklch(35.6% 0.034 255.3)
-
Step 950
950
#1F2731
oklch(27% 0.022 254.2)
#303D4E 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) | #373E4F | 0.012 |
| Deuteranopia (no green cones) | #333B4E | 0.007 |
| Tritanopia (no blue cones) | #274143 | 0.030 |
| Achromatopsia (no color) | #3C3C3C | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303D4E
#303D4E
oklch(35.6% 0.034 255.3)
- #473A28
#473A28
oklch(35.7% 0.034 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 #303D4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.024
- Dark Blue Grey #1F3B4D ΔE 0.024
- Charcoal #264653 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.031
- Charcoal Grey #3C4142 ΔE 0.033
- Gunmetal #293241 ΔE 0.041
- Midnight Green #073B4C ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.044
Use #303D4E 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.