#378C8F
Closest named color: Dark Cyan (#008B8B). oklch(59% 0.081 198.4), rgb(55, 140, 143).
Aa
Black text reads best on this color (5.31:1).
About this color
#378C8F is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.081 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.023 away. Black text reads best on it, at 5.31:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.31:1 |
| White text | 3.95:1 |
Values
| HEX | #378C8F |
| RGB | rgb(55, 140, 143) |
| HSL | hsl(182, 44%, 39%) |
| OKLCH | oklch(59% 0.081 198.4) |
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 #378C8F | 3.95:1 | AA large text | Lc -72.2 | Content text, not long reading |
| Black text on #378C8F | 5.31:1 | AA | Lc 37.4 | Non-text elements, placeholder text |
| #378C8F text on white | 3.95:1 | AA large text | Lc 66.7 | Content text, not long reading |
| #378C8F text on black | 5.31:1 | AA | Lc -35.0 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#CBDDDE
oklch(88.4% 0.019 200.8)
-
Step 300
300
#A6C8C9
oklch(80.8% 0.036 198.7)
-
Step 400
400
#75ACAE
oklch(70.7% 0.058 198.8)
-
Step 500
500
#4D979A
oklch(63% 0.074 198.9)
-
Step 600
600 (this color)
#378C8F
oklch(59% 0.081 198.4)
-
Step 700
700
#1B6E70
oklch(49.2% 0.076 197.4)
-
Step 800
800
#1A595B
oklch(42.6% 0.062 198.1)
-
Step 900
900
#1D494B
oklch(37.6% 0.048 199.4)
-
Step 950
950
#122B2C
oklch(27% 0.031 198.9)
#378C8F 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) | #83868F | 0.083 |
| Deuteranopia (no green cones) | #757C90 | 0.077 |
| Tritanopia (no blue cones) | #00918D | 0.024 |
| Achromatopsia (no color) | #808080 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378C8F
#378C8F
oklch(59% 0.081 198.4)
- #A8696B
#A8696B
oklch(59% 0.081 17.8)
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 #378C8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.023
- Teal Green #0A9396 ΔE 0.024
- Dusty Teal #4C9085 ΔE 0.028
- Teal Blue #01889F ΔE 0.036
- Sea #3C9992 ΔE 0.039
- Blue Green #0F9B8E ΔE 0.047
- Teal #008080 ΔE 0.049
- Persian Green #2A9D8F ΔE 0.051
Use #378C8F 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.