#304556
Closest named color: Dark Grey Blue (#29465B). oklch(38% 0.039 243.5), rgb(48, 69, 86).
Aa
White text reads best on this color (9.94:1).
About this color
#304556 is a dark, muted blue. In OKLCH its lightness is 38%, its chroma 0.039 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.011 away. White text reads best on it, at 9.94:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.11:1 |
| White text | 9.94:1 |
Values
| HEX | #304556 |
| RGB | rgb(48, 69, 86) |
| HSL | hsl(207, 28%, 26%) |
| OKLCH | oklch(38% 0.039 243.5) |
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 #304556 | 9.94:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #304556 | 2.11:1 | Fails | Lc 10.9 | Not readable |
| #304556 text on white | 9.94:1 | AAA | Lc 93.0 | Preferred for body text |
| #304556 text on black | 2.11:1 | Fails | Lc -9.4 | 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
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#D0DBE3
oklch(88.5% 0.016 239.1)
-
Step 300
300
#B1C3D3
oklch(80.9% 0.03 245)
-
Step 400
400
#88A5BC
oklch(70.8% 0.047 242.3)
-
Step 500
500
#6A8EAC
oklch(63.1% 0.061 244.1)
-
Step 600
600
#517897
oklch(55.6% 0.065 243.3)
-
Step 700
700
#416581
oklch(49.1% 0.061 242.9)
-
Step 800
800
#365269
oklch(42.6% 0.051 244.2)
-
Step 900
900 (this color)
#304556
oklch(38% 0.039 243.5)
-
Step 950
950
#1C2832
oklch(27% 0.025 244)
#304556 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) | #3E4557 | 0.020 |
| Deuteranopia (no green cones) | #394156 | 0.017 |
| Tritanopia (no blue cones) | #22494B | 0.031 |
| Achromatopsia (no color) | #434343 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304556
#304556
oklch(38% 0.039 243.5)
- #523E2C
#523E2C
oklch(38.1% 0.04 63.2)
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 #304556, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.011
- Charcoal #264653 ΔE 0.014
- Charcoal Grey #3C4142 ΔE 0.035
- Dark Slate Gray #2F4F4F ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.042
- Onyx #343A40 ΔE 0.044
- Dark Teal #014D4E ΔE 0.048
- Deep Teal #00555A ΔE 0.056
Use #304556 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.