#304B5D
Closest named color: Dark Grey Blue (#29465B). oklch(39.9% 0.045 238.6), rgb(48, 75, 93).
Aa
White text reads best on this color (9.16:1).
About this color
#304B5D is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.045 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.019 away. White text reads best on it, at 9.16:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.29:1 |
| White text | 9.16:1 |
Values
| HEX | #304B5D |
| RGB | rgb(48, 75, 93) |
| HSL | hsl(204, 32%, 28%) |
| OKLCH | oklch(39.9% 0.045 238.6) |
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 #304B5D | 9.16:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #304B5D | 2.29:1 | Fails | Lc 12.9 | Not readable |
| #304B5D text on white | 9.16:1 | AAA | Lc 91.1 | Preferred for body text |
| #304B5D text on black | 2.29:1 | Fails | Lc -11.3 | 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
#CEDBE4
oklch(88.4% 0.019 237.8)
-
Step 300
300
#ADC4D4
oklch(80.8% 0.034 238.3)
-
Step 400
400
#82A6BF
oklch(70.7% 0.054 238.8)
-
Step 500
500
#6190AF
oklch(63.2% 0.069 238.2)
-
Step 600
600
#477A9A
oklch(55.7% 0.074 237.7)
-
Step 700
700
#386684
oklch(49.1% 0.07 239)
-
Step 800
800
#2F536B
oklch(42.6% 0.058 239.3)
-
Step 900
900 (this color)
#304B5D
oklch(39.9% 0.045 238.6)
-
Step 950
950
#192833
oklch(26.9% 0.029 241)
#304B5D 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) | #434B5E | 0.026 |
| Deuteranopia (no green cones) | #3D465D | 0.022 |
| Tritanopia (no blue cones) | #1D5051 | 0.036 |
| Achromatopsia (no color) | #484848 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304B5D
#304B5D
oklch(39.9% 0.045 238.6)
- #5A422F
#5A422F
oklch(40% 0.045 59.4)
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 #304B5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.019
- Charcoal #264653 ΔE 0.026
- Dark Slate Gray #2F4F4F ΔE 0.031
- Deep Teal #00555A ΔE 0.044
- Dark Teal #014D4E ΔE 0.047
- Charcoal Grey #3C4142 ΔE 0.048
- Dark Blue Green #005249 ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.060
Use #304B5D 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.