#304B56
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.6% 0.038 225.5), rgb(48, 75, 86).
Aa
White text reads best on this color (9.26:1).
About this color
#304B56 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.038 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.021 away. White text reads best on it, at 9.26:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #304B56 |
| RGB | rgb(48, 75, 86) |
| HSL | hsl(197, 28%, 26%) |
| OKLCH | oklch(39.6% 0.038 225.5) |
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 #304B56 | 9.26:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #304B56 | 2.26:1 | Fails | Lc 12.6 | Not readable |
| #304B56 text on white | 9.26:1 | AAA | Lc 91.3 | Preferred for body text |
| #304B56 text on black | 2.26:1 | Fails | Lc -11.0 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBEE
oklch(93.6% 0.009 225.1)
-
Step 200
200
#CFDCE1
oklch(88.6% 0.016 222.7)
-
Step 300
300
#AEC5CF
oklch(80.9% 0.029 225.8)
-
Step 400
400
#83A7B6
oklch(70.7% 0.045 225.3)
-
Step 500
500
#6391A4
oklch(63.1% 0.057 225.7)
-
Step 600
600
#497B8F
oklch(55.6% 0.062 225.7)
-
Step 700
700
#3A687A
oklch(49.2% 0.058 225.4)
-
Step 800
800
#305563
oklch(42.8% 0.048 224.4)
-
Step 900
900 (this color)
#304B56
oklch(39.6% 0.038 225.5)
-
Step 950
950
#1A292F
oklch(27% 0.023 224.8)
#304B56 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) | #454A57 | 0.030 |
| Deuteranopia (no green cones) | #3F4556 | 0.027 |
| Tritanopia (no blue cones) | #214E4E | 0.025 |
| Achromatopsia (no color) | #474747 | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304B56
#304B56
oklch(39.6% 0.038 225.5)
- #584036
#584036
oklch(39.5% 0.038 43.6)
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 #304B56, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.021
- Charcoal #264653 ΔE 0.021
- Dark Grey Blue #29465B ΔE 0.023
- Dark Teal #014D4E ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.040
- Deep Teal #00555A ΔE 0.041
- Dark Blue Green #005249 ΔE 0.050
- Onyx #343A40 ΔE 0.057
Use #304B56 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.