#378AA5
Closest named color: Blue NCS (#118AB2). oklch(59.4% 0.089 222.9), rgb(55, 138, 165).
Aa
Black text reads best on this color (5.34:1).
About this color
#378AA5 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.089 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.025 away. Black text reads best on it, at 5.34:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.34:1 |
| White text | 3.93:1 |
Values
| HEX | #378AA5 |
| RGB | rgb(55, 138, 165) |
| HSL | hsl(195, 50%, 43%) |
| OKLCH | oklch(59.4% 0.089 222.9) |
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 #378AA5 | 3.93:1 | AA large text | Lc -72.0 | Content text, not long reading |
| Black text on #378AA5 | 5.34:1 | AA | Lc 37.6 | Non-text elements, placeholder text |
| #378AA5 text on white | 3.93:1 | AA large text | Lc 66.5 | Content text, not long reading |
| #378AA5 text on black | 5.34:1 | AA | Lc -35.2 | 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
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C9DDE5
oklch(88.5% 0.024 223.7)
-
Step 300
300
#A3C7D5
oklch(80.8% 0.043 223.5)
-
Step 400
400
#6FABC0
oklch(70.8% 0.069 222.1)
-
Step 500
500 (this color)
#378AA5
oklch(59.4% 0.089 222.9)
-
Step 600
600
#1A7F9C
oklch(55.5% 0.096 222.8)
-
Step 700
700
#066B86
oklch(49.1% 0.09 223.5)
-
Step 800
800
#0F576C
oklch(42.6% 0.074 223.1)
-
Step 900
900
#174858
oklch(37.7% 0.058 223.4)
-
Step 950
950
#0F2A33
oklch(26.8% 0.037 222.6)
#378AA5 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) | #7A87A6 | 0.070 |
| Deuteranopia (no green cones) | #6B7BA5 | 0.064 |
| Tritanopia (no blue cones) | #009293 | 0.047 |
| Achromatopsia (no color) | #808080 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378AA5
#378AA5
oklch(59.4% 0.089 222.9)
- #AB6C53
#AB6C53
oklch(59.3% 0.089 42.3)
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 #378AA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.025
- Teal Blue #01889F ΔE 0.025
- Off Blue #5684AE ΔE 0.037
- Dusty Blue #5A86AD ΔE 0.037
- Steel Blue #4682B4 ΔE 0.039
- Cool Blue #4984B8 ΔE 0.041
- Cerulean #457B9D ΔE 0.042
- Stormy Blue #507B9C ΔE 0.044
Use #378AA5 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.