#304356
Closest named color: Dark Grey Blue (#29465B). oklch(37.5% 0.041 249), rgb(48, 67, 86).
Aa
White text reads best on this color (10.17:1).
About this color
#304356 is a dark, muted blue. In OKLCH its lightness is 38%, its chroma 0.041 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.013 away. White text reads best on it, at 10.17:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.06:1 |
| White text | 10.17:1 |
Values
| HEX | #304356 |
| RGB | rgb(48, 67, 86) |
| HSL | hsl(210, 28%, 26%) |
| OKLCH | oklch(37.5% 0.041 249) |
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 #304356 | 10.17:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #304356 | 2.06:1 | Fails | Lc 10.3 | Not readable |
| #304356 text on white | 10.17:1 | AAA | Lc 93.6 | Preferred for body text |
| #304356 text on black | 2.06:1 | Fails | Lc -8.9 | 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
#E5EAF0
oklch(93.5% 0.01 252.8)
-
Step 200
200
#D1DAE4
oklch(88.4% 0.017 250.9)
-
Step 300
300
#B2C3D4
oklch(81% 0.03 248.2)
-
Step 400
400
#89A4BE
oklch(70.7% 0.049 247.5)
-
Step 500
500
#6C8DAE
oklch(63.1% 0.062 248.8)
-
Step 600
600
#53779A
oklch(55.6% 0.068 248.5)
-
Step 700
700
#446483
oklch(49.2% 0.062 248.4)
-
Step 800
800
#38516B
oklch(42.6% 0.053 250.1)
-
Step 900
900 (this color)
#304356
oklch(37.5% 0.041 249)
-
Step 950
950
#1D2833
oklch(27.2% 0.026 248.8)
#304356 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) | #3C4357 | 0.018 |
| Deuteranopia (no green cones) | #373F56 | 0.015 |
| Tritanopia (no blue cones) | #224749 | 0.035 |
| Achromatopsia (no color) | #414141 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304356
#304356
oklch(37.5% 0.041 249)
- #4F3D29
#4F3D29
oklch(37.4% 0.04 69)
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 #304356, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.013
- Charcoal #264653 ΔE 0.017
- Charcoal Grey #3C4142 ΔE 0.036
- Dark Blue Grey #1F3B4D ΔE 0.038
- Onyx #343A40 ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.045
- Dark Teal #014D4E ΔE 0.052
- Midnight Green #073B4C ΔE 0.053
Use #304356 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.