#378AA4
Closest named color: Teal Blue (#01889F). oklch(59.4% 0.088 222), rgb(55, 138, 164).
Aa
Black text reads best on this color (5.33:1).
About this color
#378AA4 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.088 and its hue 222°. Its hue sits on the cool side of the wheel. The nearest named color is Teal Blue (#01889F), ΔE 0.025 away. Black text reads best on it, at 5.33:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Teal Blue (#01889F) |
| Black text | 5.33:1 |
| White text | 3.93:1 |
Values
| HEX | #378AA4 |
| RGB | rgb(55, 138, 164) |
| HSL | hsl(194, 50%, 43%) |
| OKLCH | oklch(59.4% 0.088 222) |
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 #378AA4 | 3.93:1 | AA large text | Lc -72.0 | Content text, not long reading |
| Black text on #378AA4 | 5.33:1 | AA | Lc 37.6 | Non-text elements, placeholder text |
| #378AA4 text on white | 3.93:1 | AA large text | Lc 66.5 | Content text, not long reading |
| #378AA4 text on black | 5.33:1 | 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)
#378AA4
oklch(59.4% 0.088 222)
-
Step 600
600
#1B7F9B
oklch(55.5% 0.095 222.1)
-
Step 700
700
#076B85
oklch(49% 0.089 222.7)
-
Step 800
800
#0F586C
oklch(42.8% 0.074 221.7)
-
Step 900
900
#174857
oklch(37.6% 0.057 221.9)
-
Step 950
950
#0F2A33
oklch(26.8% 0.037 222.6)
#378AA4 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) | #7B87A5 | 0.072 |
| Deuteranopia (no green cones) | #6B7BA4 | 0.064 |
| Tritanopia (no blue cones) | #009292 | 0.047 |
| Achromatopsia (no color) | #808080 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378AA4
#378AA4
oklch(59.4% 0.088 222)
- #AB6C54
#AB6C54
oklch(59.3% 0.088 41.6)
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 #378AA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Teal Blue #01889F ΔE 0.025
- Blue NCS #118AB2 ΔE 0.026
- Off Blue #5684AE ΔE 0.038
- Dusty Blue #5A86AD ΔE 0.038
- Steel Blue #4682B4 ΔE 0.040
- Cerulean #457B9D ΔE 0.042
- Cool Blue #4984B8 ΔE 0.043
- Teal Green #0A9396 ΔE 0.043
Use #378AA4 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.