#304059
Closest named color: Dark Grey Blue (#29465B). oklch(36.9% 0.048 259.1), rgb(48, 64, 89).
Aa
White text reads best on this color (10.48:1).
About this color
#304059 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.048 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.019 away. White text reads best on it, at 10.48:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.00:1 |
| White text | 10.48:1 |
Values
| HEX | #304059 |
| RGB | rgb(48, 64, 89) |
| HSL | hsl(217, 30%, 27%) |
| OKLCH | oklch(36.9% 0.048 259.1) |
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 #304059 | 10.48:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #304059 | 2.00:1 | Fails | Lc 9.6 | Not readable |
| #304059 text on white | 10.48:1 | AAA | Lc 94.3 | Preferred for body text |
| #304059 text on black | 2.00:1 | Fails | Lc -8.3 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D1DAE7
oklch(88.5% 0.02 257.5)
-
Step 300
300
#B3C2D8
oklch(81% 0.035 257.9)
-
Step 400
400
#8BA2C5
oklch(70.7% 0.058 258.7)
-
Step 500
500
#6F8BB6
oklch(63.2% 0.073 258.8)
-
Step 600
600
#5774A2
oklch(55.6% 0.08 259.4)
-
Step 700
700
#47618B
oklch(49% 0.075 259.7)
-
Step 800
800
#3A5071
oklch(42.8% 0.062 258.3)
-
Step 900
900 (this color)
#304059
oklch(36.9% 0.048 259.1)
-
Step 950
950
#1D2735
oklch(27% 0.03 256.9)
#304059 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) | #37415A | 0.011 |
| Deuteranopia (no green cones) | #323E58 | 0.006 |
| Tritanopia (no blue cones) | #214549 | 0.042 |
| Achromatopsia (no color) | #3F3F3F | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304059
#304059
oklch(36.9% 0.048 259.1)
- #4D3C21
#4D3C21
oklch(36.8% 0.048 78)
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 #304059, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.019
- Charcoal #264653 ΔE 0.027
- Dark Blue Grey #1F3B4D ΔE 0.035
- Onyx #343A40 ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.046
- Midnight Green #073B4C ΔE 0.051
- Gunmetal #293241 ΔE 0.057
Use #304059 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.