#378ECC
Closest named color: Water Blue (#0E87CC). oklch(62.3% 0.125 243.6), rgb(55, 142, 204).
Aa
Black text reads best on this color (5.90:1).
About this color
#378ECC is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.125 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.029 away. Black text reads best on it, at 5.90:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.90:1 |
| White text | 3.55:1 |
Values
| HEX | #378ECC |
| RGB | rgb(55, 142, 204) |
| HSL | hsl(205, 59%, 51%) |
| OKLCH | oklch(62.3% 0.125 243.6) |
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 #378ECC | 3.55:1 | AA large text | Lc -68.3 | Content text, not long reading |
| Black text on #378ECC | 5.90:1 | AA | Lc 41.2 | Non-text elements, placeholder text |
| #378ECC text on white | 3.55:1 | AA large text | Lc 62.8 | Content text, not long reading |
| #378ECC text on black | 5.90:1 | AA | Lc -38.9 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C7DCEE
oklch(88.4% 0.034 244)
-
Step 300
300
#9FC6E6
oklch(80.9% 0.062 243.3)
-
Step 400
400
#69A7D9
oklch(70.6% 0.098 244.1)
-
Step 500
500 (this color)
#378ECC
oklch(62.3% 0.125 243.6)
-
Step 600
600
#027ABC
oklch(55.7% 0.135 243.4)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005383
oklch(42.6% 0.105 243.8)
-
Step 900
900
#114569
oklch(37.6% 0.081 243.9)
-
Step 950
950
#0C293E
oklch(27.1% 0.052 243.5)
#378ECC 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) | #7290CF | 0.058 |
| Deuteranopia (no green cones) | #5D81CB | 0.045 |
| Tritanopia (no blue cones) | #009DA4 | 0.087 |
| Achromatopsia (no color) | #888888 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378ECC
#378ECC
oklch(62.3% 0.125 243.6)
- #BB7428
#BB7428
oklch(62.3% 0.125 62.9)
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 #378ECC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.029
- Cool Blue #4984B8 ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.039
- Steel Blue #4682B4 ΔE 0.043
- Faded Blue #658CBB ΔE 0.045
- Blue NCS #118AB2 ΔE 0.046
- Off Blue #5684AE ΔE 0.050
- Dusty Blue #5A86AD ΔE 0.052
Use #378ECC 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.