#378B91
Closest named color: Dark Cyan (#008B8B). oklch(58.9% 0.08 201.8), rgb(55, 139, 145).
Aa
Black text reads best on this color (5.26:1).
About this color
#378B91 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.080 and its hue 202°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.024 away. Black text reads best on it, at 5.26:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.26:1 |
| White text | 3.98:1 |
Values
| HEX | #378B91 |
| RGB | rgb(55, 139, 145) |
| HSL | hsl(184, 45%, 39%) |
| OKLCH | oklch(58.9% 0.08 201.8) |
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 #378B91 | 3.98:1 | AA large text | Lc -72.5 | Content text, not long reading |
| Black text on #378B91 | 5.26:1 | AA | Lc 37.1 | Non-text elements, placeholder text |
| #378B91 text on white | 3.98:1 | AA large text | Lc 67.0 | Content text, not long reading |
| #378B91 text on black | 5.26:1 | AA | Lc -34.7 | 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECED
oklch(93.6% 0.011 204.1)
-
Step 200
200
#CBDDDF
oklch(88.5% 0.019 204.8)
-
Step 300
300
#A6C8CA
oklch(80.9% 0.036 200.9)
-
Step 400
400
#75ACB0
oklch(70.8% 0.058 201.7)
-
Step 500
500
#4D979C
oklch(63.1% 0.074 201.3)
-
Step 600
600 (this color)
#378B91
oklch(58.9% 0.08 201.8)
-
Step 700
700
#1C6D73
oklch(49.1% 0.075 202.4)
-
Step 800
800
#1B595D
oklch(42.7% 0.062 201.3)
-
Step 900
900
#1E494C
oklch(37.6% 0.048 201.5)
-
Step 950
950
#132B2D
oklch(27.1% 0.03 202.6)
#378B91 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) | #818592 | 0.081 |
| Deuteranopia (no green cones) | #737B91 | 0.075 |
| Tritanopia (no blue cones) | #00908D | 0.026 |
| Achromatopsia (no color) | #7F7F7F | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378B91
#378B91
oklch(58.9% 0.08 201.8)
- #A76967
#A76967
oklch(58.7% 0.08 21.8)
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 #378B91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.024
- Teal Green #0A9396 ΔE 0.026
- Dusty Teal #4C9085 ΔE 0.032
- Teal Blue #01889F ΔE 0.032
- Sea #3C9992 ΔE 0.043
- Teal #008080 ΔE 0.048
- Blue Green #0F9B8E ΔE 0.051
- Blue NCS #118AB2 ΔE 0.054
Use #378B91 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.