#304B65
Closest named color: Dark Grey Blue (#29465B). oklch(40.3% 0.055 248.4), rgb(48, 75, 101).
Aa
White text reads best on this color (9.05:1).
About this color
#304B65 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.055 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.024 away. White text reads best on it, at 9.05:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.32:1 |
| White text | 9.05:1 |
Values
| HEX | #304B65 |
| RGB | rgb(48, 75, 101) |
| HSL | hsl(209, 36%, 29%) |
| OKLCH | oklch(40.3% 0.055 248.4) |
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 #304B65 | 9.05:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #304B65 | 2.32:1 | Fails | Lc 13.2 | Not readable |
| #304B65 text on white | 9.05:1 | AAA | Lc 90.7 | Preferred for body text |
| #304B65 text on black | 2.32:1 | Fails | Lc -11.6 | 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
#E5EAF0
oklch(93.5% 0.01 252.8)
-
Step 200
200
#D0DAE5
oklch(88.4% 0.019 250.6)
-
Step 300
300
#B1C3D5
oklch(80.9% 0.032 248.2)
-
Step 400
400
#88A4C0
oklch(70.7% 0.052 248.6)
-
Step 500
500
#6A8DB0
oklch(63.1% 0.066 248.9)
-
Step 600
600
#51779C
oklch(55.6% 0.072 248.6)
-
Step 700
700
#426485
oklch(49.1% 0.066 248.6)
-
Step 800
800 (this color)
#304B65
oklch(40.3% 0.055 248.4)
-
Step 900
900
#2F4458
oklch(37.8% 0.043 247.8)
-
Step 950
950
#1C2833
oklch(27.1% 0.026 246.6)
#304B65 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) | #404C66 | 0.022 |
| Deuteranopia (no green cones) | #3A4664 | 0.019 |
| Tritanopia (no blue cones) | #175154 | 0.047 |
| Achromatopsia (no color) | #494949 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304B65
#304B65
oklch(40.3% 0.055 248.4)
- #5C4326
#5C4326
oklch(40.3% 0.055 69.3)
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 #304B65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.024
- Charcoal #264653 ΔE 0.035
- Dark Slate Gray #2F4F4F ΔE 0.044
- Deep Teal #00555A ΔE 0.052
- Light Navy #155084 ΔE 0.053
- Deep Sea Blue #015482 ΔE 0.054
- YInMn Blue #415A77 ΔE 0.057
- Dark Teal #014D4E ΔE 0.058
Use #304B65 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.