#303B4F
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.1% 0.038 262.2), rgb(48, 59, 79).
Aa
White text reads best on this color (11.26:1).
About this color
#303B4F is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.038 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.023 away. White text reads best on it, at 11.26:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.86:1 |
| White text | 11.26:1 |
Values
| HEX | #303B4F |
| RGB | rgb(48, 59, 79) |
| HSL | hsl(219, 24%, 25%) |
| OKLCH | oklch(35.1% 0.038 262.2) |
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 #303B4F | 11.26:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #303B4F | 1.86:1 | Fails | Lc 7.9 | Not readable |
| #303B4F text on white | 11.26:1 | AAA | Lc 96.0 | Preferred for body text |
| #303B4F text on black | 1.86:1 | 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
#D3D9E4
oklch(88.4% 0.016 262.7)
-
Step 300
300
#B7C1D4
oklch(80.9% 0.029 263.4)
-
Step 400
400
#91A1BE
oklch(70.6% 0.046 262.3)
-
Step 500
500
#768AAD
oklch(63.1% 0.058 261.5)
-
Step 600
600
#5F7499
oklch(55.7% 0.063 261.5)
-
Step 700
700
#4E6183
oklch(49.1% 0.06 261.8)
-
Step 800
800
#404F6A
oklch(42.6% 0.049 261.9)
-
Step 900
900 (this color)
#303B4F
oklch(35.1% 0.038 262.2)
-
Step 950
950
#202732
oklch(27.1% 0.023 259.3)
#303B4F 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) | #343C50 | 0.007 |
| Deuteranopia (no green cones) | #31394F | 0.007 |
| Tritanopia (no blue cones) | #263F42 | 0.034 |
| Achromatopsia (no color) | #3B3B3B | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303B4F
#303B4F
oklch(35.1% 0.038 262.2)
- #453923
#453923
oklch(35.1% 0.039 82)
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 #303B4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.023
- Onyx #343A40 ΔE 0.026
- Charcoal #264653 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.036
- Gunmetal #293241 ΔE 0.037
- Prussian Blue #1D3557 ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.039
- Midnight Green #073B4C ΔE 0.042
Use #303B4F 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.