#378B74
Closest named color: Viridian (#1E9167). oklch(57.9% 0.089 172.1), rgb(55, 139, 116).
Aa
Black text reads best on this color (5.10:1).
About this color
#378B74 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.089 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.034 away. Black text reads best on it, at 5.10:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Viridian (#1E9167) |
| Black text | 5.10:1 |
| White text | 4.11:1 |
Values
| HEX | #378B74 |
| RGB | rgb(55, 139, 116) |
| HSL | hsl(164, 43%, 38%) |
| OKLCH | oklch(57.9% 0.089 172.1) |
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 #378B74 | 4.11:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #378B74 | 5.10:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #378B74 text on white | 4.11:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #378B74 text on black | 5.10:1 | AA | Lc -33.7 | 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
#A7C9BE
oklch(80.8% 0.04 173.7)
-
Step 400
400
#77AE9C
oklch(70.7% 0.064 172)
-
Step 500
500
#509A84
oklch(63.2% 0.082 172)
-
Step 600
600 (this color)
#378B74
oklch(57.9% 0.089 172.1)
-
Step 700
700
#20705B
oklch(49.2% 0.083 171.6)
-
Step 800
800
#1E5B4B
oklch(42.7% 0.068 172.5)
-
Step 900
900
#1F4B3E
oklch(37.7% 0.054 171.4)
-
Step 950
950
#132C25
oklch(27% 0.034 173.4)
#378B74 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) | #878273 | 0.092 |
| Deuteranopia (no green cones) | #7B7976 | 0.090 |
| Tritanopia (no blue cones) | #008C84 | 0.028 |
| Achromatopsia (no color) | #7D7D7D | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378B74
#378B74
oklch(57.9% 0.089 172.1)
- #A2637F
#A2637F
oklch(57.8% 0.089 352.1)
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 #378B74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.034
- Dusty Teal #4C9085 ΔE 0.035
- Dark Cyan #008B8B ΔE 0.038
- Sea Green #2E8B57 ΔE 0.044
- Ocean Green #3D9973 ΔE 0.044
- Dark Sage #598556 ΔE 0.045
- Slate Green #658D6D ΔE 0.045
- Teal Green #0A9396 ΔE 0.049
Use #378B74 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.