#304F67
Closest named color: Dark Grey Blue (#29465B). oklch(41.4% 0.055 243), rgb(48, 79, 103).
Aa
White text reads best on this color (8.60:1).
About this color
#304F67 is a dark, muted blue. In OKLCH its lightness is 41%, its chroma 0.055 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.034 away. White text reads best on it, at 8.60:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.43:1 |
| White text | 8.60:1 |
Values
| HEX | #304F67 |
| RGB | rgb(48, 79, 103) |
| HSL | hsl(206, 36%, 30%) |
| OKLCH | oklch(41.4% 0.055 243) |
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 #304F67 | 8.60:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #304F67 | 2.43:1 | Fails | Lc 14.5 | Not readable |
| #304F67 text on white | 8.60:1 | AAA | Lc 89.5 | Fine for body text |
| #304F67 text on black | 2.43:1 | Fails | Lc -12.8 | 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 800.
-
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
#B0C4D4
oklch(81% 0.031 242.1)
-
Step 400
400
#85A5BE
oklch(70.7% 0.051 242)
-
Step 500
500
#668EAE
oklch(63% 0.066 243.2)
-
Step 600
600
#4D789A
oklch(55.5% 0.071 243.4)
-
Step 700
700
#3E6583
oklch(49.1% 0.066 242.8)
-
Step 800
800 (this color)
#304F67
oklch(41.4% 0.055 243)
-
Step 900
900
#2D4457
oklch(37.6% 0.044 244.2)
-
Step 950
950
#1B2833
oklch(27% 0.027 244.6)
#304F67 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) | #454F68 | 0.028 |
| Deuteranopia (no green cones) | #3D4967 | 0.024 |
| Tritanopia (no blue cones) | #145557 | 0.045 |
| Achromatopsia (no color) | #4C4C4C | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304F67
#304F67
oklch(41.4% 0.055 243)
- #61452B
#61452B
oklch(41.5% 0.055 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 #304F67, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.034
- Dark Slate Gray #2F4F4F ΔE 0.042
- Charcoal #264653 ΔE 0.043
- Deep Teal #00555A ΔE 0.046
- YInMn Blue #415A77 ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.049
- Light Navy #155084 ΔE 0.051
- Petrol #005F6A ΔE 0.053
Use #304F67 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.