#378ECA
Closest named color: Water Blue (#0E87CC). oklch(62.2% 0.122 242.7), rgb(55, 142, 202).
Aa
Black text reads best on this color (5.88:1).
About this color
#378ECA is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.122 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.030 away. Black text reads best on it, at 5.88:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.88:1 |
| White text | 3.56:1 |
Values
| HEX | #378ECA |
| RGB | rgb(55, 142, 202) |
| HSL | hsl(204, 58%, 50%) |
| OKLCH | oklch(62.2% 0.122 242.7) |
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 #378ECA | 3.56:1 | AA large text | Lc -68.4 | Content text, not long reading |
| Black text on #378ECA | 5.88:1 | AA | Lc 41.1 | Non-text elements, placeholder text |
| #378ECA text on white | 3.56:1 | AA large text | Lc 62.9 | Content text, not long reading |
| #378ECA text on black | 5.88:1 | AA | Lc -38.7 | 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 500.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C7DCEE
oklch(88.4% 0.034 244)
-
Step 300
300
#A0C6E5
oklch(81% 0.06 243.2)
-
Step 400
400
#69A8D8
oklch(70.8% 0.096 242.6)
-
Step 500
500 (this color)
#378ECA
oklch(62.2% 0.122 242.7)
-
Step 600
600
#037ABA
oklch(55.6% 0.133 242.7)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#015482
oklch(42.8% 0.102 242.6)
-
Step 900
900
#114668
oklch(37.8% 0.079 242.1)
-
Step 950
950
#0C293D
oklch(27% 0.051 242.2)
#378ECA 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) | #728FCD | 0.057 |
| Deuteranopia (no green cones) | #5E81C9 | 0.046 |
| Tritanopia (no blue cones) | #009DA3 | 0.086 |
| Achromatopsia (no color) | #878787 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378ECA
#378ECA
oklch(62.2% 0.122 242.7)
- #BA742B
#BA742B
oklch(62.2% 0.123 62.6)
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 #378ECA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.030
- Cool Blue #4984B8 ΔE 0.034
- Steel Blue #4682B4 ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.042
- Blue NCS #118AB2 ΔE 0.043
- Faded Blue #658CBB ΔE 0.044
- Off Blue #5684AE ΔE 0.048
- Dusty Blue #5A86AD ΔE 0.049
Use #378ECA 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.