#378B9E
Closest named color: Teal Blue (#01889F). oklch(59.4% 0.085 215.3), rgb(55, 139, 158).
Aa
Black text reads best on this color (5.34:1).
About this color
#378B9E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.085 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.024 away. Black text reads best on it, at 5.34:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.34:1 |
| White text | 3.92:1 |
Values
| HEX | #378B9E |
| RGB | rgb(55, 139, 158) |
| HSL | hsl(191, 48%, 42%) |
| OKLCH | oklch(59.4% 0.085 215.3) |
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 #378B9E | 3.92:1 | AA large text | Lc -71.9 | Content text, not long reading |
| Black text on #378B9E | 5.34:1 | AA | Lc 37.7 | Non-text elements, placeholder text |
| #378B9E text on white | 3.92:1 | AA large text | Lc 66.4 | Content text, not long reading |
| #378B9E text on black | 5.34:1 | AA | Lc -35.3 | 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 500.
-
Step 50
50
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECEF
oklch(93.6% 0.012 215.8)
-
Step 200
200
#C9DDE3
oklch(88.4% 0.023 217.7)
-
Step 300
300
#A3C8D1
oklch(80.9% 0.041 214.2)
-
Step 400
400
#6FABBB
oklch(70.6% 0.066 216.5)
-
Step 500
500 (this color)
#378B9E
oklch(59.4% 0.085 215.3)
-
Step 600
600
#1A8095
oklch(55.5% 0.092 215.8)
-
Step 700
700
#066C7F
oklch(49% 0.085 215.8)
-
Step 800
800
#0F5867
oklch(42.6% 0.07 215.7)
-
Step 900
900
#174954
oklch(37.7% 0.055 215.1)
-
Step 950
950
#0F2B31
oklch(27% 0.035 213.8)
#378B9E 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) | #7E879F | 0.076 |
| Deuteranopia (no green cones) | #6F7C9E | 0.068 |
| Tritanopia (no blue cones) | #009291 | 0.039 |
| Achromatopsia (no color) | #808080 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378B9E
#378B9E
oklch(59.4% 0.085 215.3)
- #AA6C5B
#AA6C5B
oklch(59.4% 0.084 36.1)
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 #378B9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.024
- Teal Green #0A9396 ΔE 0.034
- Blue NCS #118AB2 ΔE 0.035
- Dark Cyan #008B8B ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.045
- Off Blue #5684AE ΔE 0.046
- Cerulean #457B9D ΔE 0.047
- Dusty Teal #4C9085 ΔE 0.048
Use #378B9E 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.