#304558
Closest named color: Dark Grey Blue (#29465B). oklch(38.1% 0.042 246.5), rgb(48, 69, 88).
Aa
White text reads best on this color (9.91:1).
About this color
#304558 is a dark, muted blue. In OKLCH its lightness is 38%, its chroma 0.042 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.009 away. White text reads best on it, at 9.91:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.11:1 |
| White text | 9.91:1 |
Values
| HEX | #304558 |
| RGB | rgb(48, 69, 88) |
| HSL | hsl(209, 29%, 27%) |
| OKLCH | oklch(38.1% 0.042 246.5) |
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 #304558 | 9.91:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #304558 | 2.11:1 | Fails | Lc 11.0 | Not readable |
| #304558 text on white | 9.91:1 | AAA | Lc 93.0 | Preferred for body text |
| #304558 text on black | 2.11:1 | Fails | Lc -9.5 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#D0DBE4
oklch(88.6% 0.017 242.5)
-
Step 300
300
#B1C3D4
oklch(80.9% 0.031 246.7)
-
Step 400
400
#88A4BF
oklch(70.7% 0.05 247.6)
-
Step 500
500
#698EAF
oklch(63.2% 0.065 246)
-
Step 600
600
#50779A
oklch(55.5% 0.07 246.5)
-
Step 700
700
#416484
oklch(49% 0.066 247.1)
-
Step 800
800
#36526B
oklch(42.7% 0.054 246.4)
-
Step 900
900 (this color)
#304558
oklch(38.1% 0.042 246.5)
-
Step 950
950
#1C2833
oklch(27.1% 0.026 246.6)
#304558 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) | #3D4559 | 0.019 |
| Deuteranopia (no green cones) | #384158 | 0.016 |
| Tritanopia (no blue cones) | #21494B | 0.035 |
| Achromatopsia (no color) | #434343 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304558
#304558
oklch(38.1% 0.042 246.5)
- #523E2A
#523E2A
oklch(38% 0.042 66)
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 #304558, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.009
- Charcoal #264653 ΔE 0.016
- Charcoal Grey #3C4142 ΔE 0.038
- Dark Slate Gray #2F4F4F ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.043
- Onyx #343A40 ΔE 0.046
- Dark Teal #014D4E ΔE 0.050
- Deep Teal #00555A ΔE 0.057
Use #304558 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.