#305E66
Closest named color: Petrol (#005F6A). oklch(45.3% 0.052 210.1), rgb(48, 94, 102).
Aa
White text reads best on this color (7.19:1).
About this color
#305E66 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 45%, its chroma 0.052 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.026 away. White text reads best on it, at 7.19:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (45%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.91:1 |
| White text | 7.19:1 |
Values
| HEX | #305E66 |
| RGB | rgb(48, 94, 102) |
| HSL | hsl(189, 36%, 29%) |
| OKLCH | oklch(45.3% 0.052 210.1) |
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 #305E66 | 7.19:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #305E66 | 2.91:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #305E66 text on white | 7.19:1 | AAA | Lc 84.9 | Fine for body text |
| #305E66 text on black | 2.91:1 | Fails | Lc -17.2 | Dividers and decoration only |
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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E4ECED
oklch(93.7% 0.009 205.9)
-
Step 200
200
#CDDCDF
oklch(88.4% 0.017 211)
-
Step 300
300
#ABC6CB
oklch(80.8% 0.03 210.1)
-
Step 400
400
#7DA9B1
oklch(70.6% 0.049 210)
-
Step 500
500
#5B949E
oklch(63.1% 0.062 209.8)
-
Step 600
600
#3E7E89
oklch(55.5% 0.067 210.1)
-
Step 700
700
#306A74
oklch(49% 0.062 210.3)
-
Step 800
800 (this color)
#305E66
oklch(45.3% 0.052 210.1)
-
Step 900
900
#26484D
oklch(37.8% 0.04 207.8)
-
Step 950
950
#172A2D
oklch(27% 0.025 208.4)
#305E66 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) | #575B67 | 0.050 |
| Deuteranopia (no green cones) | #4E5566 | 0.044 |
| Tritanopia (no blue cones) | #0F6260 | 0.028 |
| Achromatopsia (no color) | #575757 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #305E66
#305E66
oklch(45.3% 0.052 210.1)
- #704B45
#704B45
oklch(45.2% 0.052 29.4)
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 #305E66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.026
- Dark Aqua #05696B ΔE 0.037
- Dark Green Blue #1F6357 ΔE 0.037
- YInMn Blue #415A77 ΔE 0.040
- Deep Teal #00555A ΔE 0.048
- Slate #516572 ΔE 0.051
- Dark Slate Gray #2F4F4F ΔE 0.053
- Dusty Grape #545775 ΔE 0.059
Use #305E66 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.