#304B60
Closest named color: Dark Grey Blue (#29465B). oklch(40.1% 0.048 242.8), rgb(48, 75, 96).
Aa
White text reads best on this color (9.12:1).
About this color
#304B60 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.048 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.020 away. White text reads best on it, at 9.12:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.30:1 |
| White text | 9.12:1 |
Values
| HEX | #304B60 |
| RGB | rgb(48, 75, 96) |
| HSL | hsl(206, 33%, 28%) |
| OKLCH | oklch(40.1% 0.048 242.8) |
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 #304B60 | 9.12:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #304B60 | 2.30:1 | Fails | Lc 13.0 | Not readable |
| #304B60 text on white | 9.12:1 | AAA | Lc 90.9 | Preferred for body text |
| #304B60 text on black | 2.30:1 | Fails | Lc -11.4 | 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
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CEDBE6
oklch(88.5% 0.021 243.4)
-
Step 300
300
#ADC4D7
oklch(80.9% 0.037 243.1)
-
Step 400
400
#81A5C2
oklch(70.6% 0.058 243)
-
Step 500
500
#618FB3
oklch(63.1% 0.074 242.9)
-
Step 600
600
#46799F
oklch(55.6% 0.081 242.4)
-
Step 700
700
#386588
oklch(49% 0.075 243.7)
-
Step 800
800
#2F536E
oklch(42.7% 0.061 242.5)
-
Step 900
900 (this color)
#304B60
oklch(40.1% 0.048 242.8)
-
Step 950
950
#192834
oklch(26.9% 0.03 243.3)
#304B60 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) | #424B61 | 0.025 |
| Deuteranopia (no green cones) | #3C4660 | 0.021 |
| Tritanopia (no blue cones) | #1B5052 | 0.039 |
| Achromatopsia (no color) | #484848 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304B60
#304B60
oklch(40.1% 0.048 242.8)
- #5B422C
#5B422C
oklch(40.1% 0.049 62.1)
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 #304B60, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.020
- Charcoal #264653 ΔE 0.029
- Dark Slate Gray #2F4F4F ΔE 0.036
- Deep Teal #00555A ΔE 0.047
- Dark Teal #014D4E ΔE 0.051
- Charcoal Grey #3C4142 ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.060
- YInMn Blue #415A77 ΔE 0.061
Use #304B60 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.