#307B78
Closest named color: Bluegreen (#017A79). oklch(53.6% 0.073 191.5), rgb(48, 123, 120).
Aa
White text reads best on this color (4.96:1).
About this color
#307B78 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 54%, its chroma 0.073 and its hue 192°. Its hue sits on the cool side of the wheel. The nearest named color is Bluegreen (#017A79), ΔE 0.020 away. White text reads best on it, at 4.96:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Bluegreen (#017A79) |
| Black text | 4.23:1 |
| White text | 4.96:1 |
Values
| HEX | #307B78 |
| RGB | rgb(48, 123, 120) |
| HSL | hsl(178, 44%, 34%) |
| OKLCH | oklch(53.6% 0.073 191.5) |
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 #307B78 | 4.96:1 | AA | Lc -79.5 | Fine for body text |
| Black text on #307B78 | 4.23:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #307B78 text on white | 4.96:1 | AA | Lc 74.1 | Content text, not long reading |
| #307B78 text on black | 4.23:1 | AA large text | Lc -27.6 | 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 600.
-
Step 50
50
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E3ECEB
oklch(93.6% 0.01 189.1)
-
Step 200
200
#CCDDDC
oklch(88.4% 0.018 192.6)
-
Step 300
300
#A9C8C6
oklch(80.9% 0.033 191.7)
-
Step 400
400
#7AACA9
oklch(70.8% 0.053 191.3)
-
Step 500
500
#559794
oklch(63.2% 0.068 191.8)
-
Step 600
600 (this color)
#307B78
oklch(53.6% 0.073 191.5)
-
Step 700
700
#286D6A
oklch(49.1% 0.068 191.2)
-
Step 800
800
#235957
oklch(42.7% 0.057 191.9)
-
Step 900
900
#234947
oklch(37.7% 0.044 191)
-
Step 950
950
#152B2A
oklch(27% 0.028 191.9)
#307B78 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) | #747578 | 0.078 |
| Deuteranopia (no green cones) | #686C79 | 0.073 |
| Tritanopia (no blue cones) | #007E7A | 0.019 |
| Achromatopsia (no color) | #707070 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #307B78
#307B78
oklch(53.6% 0.073 191.5)
- #935B62
#935B62
oklch(53.5% 0.074 11.7)
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 #307B78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bluegreen #017A79 ΔE 0.020
- Teal #008080 ΔE 0.021
- Deep Aqua #08787F ΔE 0.024
- Deep Turquoise #017374 ΔE 0.035
- Dark Aquamarine #017371 ΔE 0.036
- Ocean #017B92 ΔE 0.043
- Dark Cyan #008B8B ΔE 0.048
- Metallic Blue #4F738E ΔE 0.058
Use #307B78 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.