#378DB0
Closest named color: Blue NCS (#118AB2). oklch(60.7% 0.097 228.6), rgb(55, 141, 176).
Aa
Black text reads best on this color (5.59:1).
About this color
#378DB0 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 61%, its chroma 0.097 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.021 away. Black text reads best on it, at 5.59:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.59:1 |
| White text | 3.75:1 |
Values
| HEX | #378DB0 |
| RGB | rgb(55, 141, 176) |
| HSL | hsl(197, 52%, 45%) |
| OKLCH | oklch(60.7% 0.097 228.6) |
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 #378DB0 | 3.75:1 | AA large text | Lc -70.3 | Content text, not long reading |
| Black text on #378DB0 | 5.59:1 | AA | Lc 39.3 | Non-text elements, placeholder text |
| #378DB0 text on white | 3.75:1 | AA large text | Lc 64.8 | Content text, not long reading |
| #378DB0 text on black | 5.59:1 | AA | Lc -36.9 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C8DDE7
oklch(88.5% 0.026 227.9)
-
Step 300
300
#A2C7D9
oklch(80.9% 0.047 229)
-
Step 400
400
#6CAAC6
oklch(70.6% 0.076 228.4)
-
Step 500
500 (this color)
#378DB0
oklch(60.7% 0.097 228.6)
-
Step 600
600
#117EA4
oklch(55.5% 0.105 228.9)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
Step 800
800
#085772
oklch(42.7% 0.081 228.5)
-
Step 900
900
#14485C
oklch(37.8% 0.063 228)
-
Step 950
950
#0E2A36
oklch(27% 0.04 229.1)
#378DB0 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) | #7B8BB2 | 0.070 |
| Deuteranopia (no green cones) | #6A7EB0 | 0.061 |
| Tritanopia (no blue cones) | #009799 | 0.057 |
| Achromatopsia (no color) | #848484 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378DB0
#378DB0
oklch(60.7% 0.097 228.6)
- #B1704D
#B1704D
oklch(60.7% 0.096 48.6)
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 #378DB0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.021
- Dusty Blue #5A86AD ΔE 0.033
- Off Blue #5684AE ΔE 0.034
- Cool Blue #4984B8 ΔE 0.034
- Steel Blue #4682B4 ΔE 0.035
- Teal Blue #01889F ΔE 0.038
- Faded Blue #658CBB ΔE 0.047
- Cerulean #457B9D ΔE 0.052
Use #378DB0 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.