#378E9B
Closest named color: Teal Green (#0A9396). oklch(60% 0.084 208.8), rgb(55, 142, 155).
Aa
Black text reads best on this color (5.50:1).
About this color
#378E9B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 60%, its chroma 0.084 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Green (#0A9396), ΔE 0.025 away. Black text reads best on it, at 5.50:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Teal Green (#0A9396) |
| Black text | 5.50:1 |
| White text | 3.81:1 |
Values
| HEX | #378E9B |
| RGB | rgb(55, 142, 155) |
| HSL | hsl(188, 48%, 41%) |
| OKLCH | oklch(60% 0.084 208.8) |
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 #378E9B | 3.81:1 | AA large text | Lc -70.9 | Content text, not long reading |
| Black text on #378E9B | 5.50:1 | AA | Lc 38.7 | Non-text elements, placeholder text |
| #378E9B text on white | 3.81:1 | AA large text | Lc 65.4 | Content text, not long reading |
| #378E9B text on black | 5.50:1 | AA | Lc -36.3 | 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
#F1F6F7
oklch(97% 0.005 211)
-
Step 100
100
#E1ECEE
oklch(93.5% 0.012 209.8)
-
Step 200
200
#C9DEE1
oklch(88.6% 0.023 207.1)
-
Step 300
300
#A3C8CF
oklch(80.8% 0.041 210.4)
-
Step 400
400
#6EACB7
oklch(70.6% 0.066 209.9)
-
Step 500
500 (this color)
#378E9B
oklch(60% 0.084 208.8)
-
Step 600
600
#158290
oklch(55.7% 0.091 208.7)
-
Step 700
700
#006D7A
oklch(49% 0.084 209.1)
-
Step 800
800
#0B5963
oklch(42.6% 0.07 208.6)
-
Step 900
900
#164A51
oklch(37.8% 0.055 207.8)
-
Step 950
950
#0F2B2F
oklch(26.9% 0.034 207.9)
#378E9B 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) | #82899C | 0.080 |
| Deuteranopia (no green cones) | #737E9B | 0.073 |
| Tritanopia (no blue cones) | #009492 | 0.032 |
| Achromatopsia (no color) | #838383 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378E9B
#378E9B
oklch(60% 0.084 208.8)
- #AD6D63
#AD6D63
oklch(60.1% 0.084 29.4)
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 #378E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Green #0A9396 ΔE 0.025
- Teal Blue #01889F ΔE 0.031
- Dark Cyan #008B8B ΔE 0.036
- Dusty Teal #4C9085 ΔE 0.038
- Sea #3C9992 ΔE 0.040
- Blue NCS #118AB2 ΔE 0.043
- Blue Green #0F9B8E ΔE 0.051
- Dusty Blue #5A86AD ΔE 0.052
Use #378E9B 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.