#304B53
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.5% 0.035 218.4), rgb(48, 75, 83).
Aa
White text reads best on this color (9.30:1).
About this color
#304B53 is a dark, muted teal or cyan. In OKLCH its lightness is 39%, its chroma 0.035 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.017 away. White text reads best on it, at 9.30:1.
| Hue family | Teals and cyans |
| Lightness | dark (39%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.25:1 |
| White text | 9.30:1 |
Values
| HEX | #304B53 |
| RGB | rgb(48, 75, 83) |
| HSL | hsl(194, 27%, 26%) |
| OKLCH | oklch(39.5% 0.035 218.4) |
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 #304B53 | 9.30:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #304B53 | 2.25:1 | Fails | Lc 12.5 | Not readable |
| #304B53 text on white | 9.30:1 | AAA | Lc 91.4 | Preferred for body text |
| #304B53 text on black | 2.25:1 | Fails | Lc -10.9 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBED
oklch(93.5% 0.008 216.6)
-
Step 200
200
#CFDCE0
oklch(88.6% 0.015 218.1)
-
Step 300
300
#AFC5CC
oklch(80.9% 0.026 218.9)
-
Step 400
400
#84A7B2
oklch(70.6% 0.041 219)
-
Step 500
500
#6392A0
oklch(63.1% 0.055 218.4)
-
Step 600
600
#497C8A
oklch(55.6% 0.059 217.3)
-
Step 700
700
#3A6876
oklch(49% 0.055 219.6)
-
Step 800
800
#315560
oklch(42.7% 0.045 219.5)
-
Step 900
900 (this color)
#304B53
oklch(39.5% 0.035 218.4)
-
Step 950
950
#1A292E
oklch(27% 0.022 220.6)
#304B53 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) | #464953 | 0.031 |
| Deuteranopia (no green cones) | #404553 | 0.028 |
| Tritanopia (no blue cones) | #224E4D | 0.022 |
| Achromatopsia (no color) | #474747 | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #304B53
#304B53
oklch(39.5% 0.035 218.4)
- #574038
#574038
oklch(39.4% 0.035 40)
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 #304B53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.017
- Charcoal #264653 ΔE 0.022
- Dark Grey Blue #29465B ΔE 0.026
- Charcoal Grey #3C4142 ΔE 0.037
- Dark Teal #014D4E ΔE 0.037
- Deep Teal #00555A ΔE 0.040
- Dark Blue Green #005249 ΔE 0.047
- Onyx #343A40 ΔE 0.055
Use #304B53 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.