#378C74
Closest named color: Viridian (#1E9167). oklch(58.1% 0.09 171.5), rgb(55, 140, 116).
Aa
Black text reads best on this color (5.16:1).
About this color
#378C74 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.090 and its hue 171°. Its hue sits on the cool side of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.032 away. Black text reads best on it, at 5.16:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Viridian (#1E9167) |
| Black text | 5.16:1 |
| White text | 4.06:1 |
Values
| HEX | #378C74 |
| RGB | rgb(55, 140, 116) |
| HSL | hsl(163, 44%, 38%) |
| OKLCH | oklch(58.1% 0.09 171.5) |
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 #378C74 | 4.06:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #378C74 | 5.16:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #378C74 text on white | 4.06:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #378C74 text on black | 5.16:1 | AA | Lc -34.0 | Non-text elements, placeholder text |
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
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E3ECE9
oklch(93.5% 0.01 174.3)
-
Step 200
200
#CBDED7
oklch(88.4% 0.022 171.7)
-
Step 300
300
#A7CABD
oklch(81% 0.042 170.7)
-
Step 400
400
#76AE9B
oklch(70.6% 0.065 171.1)
-
Step 500
500
#4F9A83
oklch(63.1% 0.083 171.3)
-
Step 600
600 (this color)
#378C74
oklch(58.1% 0.09 171.5)
-
Step 700
700
#1F705B
oklch(49.1% 0.084 171.7)
-
Step 800
800
#1D5B4A
oklch(42.6% 0.069 171.5)
-
Step 900
900
#1F4B3E
oklch(37.7% 0.054 171.4)
-
Step 950
950
#132C24
oklch(27% 0.035 170.7)
#378C74 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) | #888373 | 0.093 |
| Deuteranopia (no green cones) | #7C7A76 | 0.090 |
| Tritanopia (no blue cones) | #008D85 | 0.029 |
| Achromatopsia (no color) | #7E7E7E | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378C74
#378C74
oklch(58.1% 0.09 171.5)
- #A46481
#A46481
oklch(58.2% 0.09 351.6)
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 #378C74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.032
- Dusty Teal #4C9085 ΔE 0.034
- Dark Cyan #008B8B ΔE 0.039
- Ocean Green #3D9973 ΔE 0.041
- Sea Green #2E8B57 ΔE 0.043
- Slate Green #658D6D ΔE 0.044
- Dark Sage #598556 ΔE 0.045
- Blue Green #0F9B8E ΔE 0.048
Use #378C74 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.