#378CD7
Closest named color: Dark Sky Blue (#448EE4). oklch(62.4% 0.139 248.8), rgb(55, 140, 215).
Aa
Black text reads best on this color (5.89:1).
About this color
#378CD7 is a medium-light, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.139 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.023 away. Black text reads best on it, at 5.89:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.89:1 |
| White text | 3.56:1 |
Values
| HEX | #378CD7 |
| RGB | rgb(55, 140, 215) |
| HSL | hsl(208, 67%, 53%) |
| OKLCH | oklch(62.4% 0.139 248.8) |
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 #378CD7 | 3.56:1 | AA large text | Lc -68.3 | Content text, not long reading |
| Black text on #378CD7 | 5.89:1 | AA | Lc 41.2 | Non-text elements, placeholder text |
| #378CD7 text on white | 3.56:1 | AA large text | Lc 62.8 | Content text, not long reading |
| #378CD7 text on black | 5.89:1 | AA | Lc -38.8 | 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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF2
oklch(88.5% 0.038 248.3)
-
Step 300
300
#9FC5EB
oklch(80.9% 0.068 248.7)
-
Step 400
400
#68A6E2
oklch(70.8% 0.109 248.9)
-
Step 500
500 (this color)
#378CD7
oklch(62.4% 0.139 248.8)
-
Step 600
600
#0377C7
oklch(55.7% 0.151 248.6)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#01518B
oklch(42.6% 0.117 248.9)
-
Step 900
900
#10446F
oklch(37.7% 0.091 248.4)
-
Step 950
950
#0C2841
oklch(27% 0.058 248.6)
#378CD7 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) | #6990DA | 0.049 |
| Deuteranopia (no green cones) | #5281D6 | 0.034 |
| Tritanopia (no blue cones) | #009EA7 | 0.103 |
| Achromatopsia (no color) | #888888 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378CD7
#378CD7
oklch(62.4% 0.139 248.8)
- #BC7500
#BC7500
oklch(62.4% 0.137 68.3)
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 #378CD7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.023
- Water Blue #0E87CC ΔE 0.030
- Chefchaouen Blue #4895EF ΔE 0.044
- Cool Blue #4984B8 ΔE 0.048
- Soft Blue #6488EA ΔE 0.052
- Steel Blue #4682B4 ΔE 0.054
- Faded Blue #658CBB ΔE 0.057
- Cornflower Blue #6495ED ΔE 0.059
Use #378CD7 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.