#378BED
Closest named color: Dark Sky Blue (#448EE4). oklch(63.5% 0.168 254.7), rgb(55, 139, 237).
Aa
Black text reads best on this color (6.07:1).
About this color
#378BED is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.168 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.019 away. Black text reads best on it, at 6.07:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.168) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.07:1 |
| White text | 3.45:1 |
Values
| HEX | #378BED |
| RGB | rgb(55, 139, 237) |
| HSL | hsl(212, 83%, 57%) |
| OKLCH | oklch(63.5% 0.168 254.7) |
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 #378BED | 3.45:1 | AA large text | Lc -67.1 | Content text, not long reading |
| Black text on #378BED | 6.07:1 | AA | Lc 42.4 | Non-text elements, placeholder text |
| #378BED text on white | 3.45:1 | AA large text | Lc 61.7 | Content text, not long reading |
| #378BED text on black | 6.07:1 | AA | Lc -40.0 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DBF7
oklch(88.4% 0.045 254.5)
-
Step 300
300
#9DC4F5
oklch(81% 0.081 254.4)
-
Step 400
400
#65A3F1
oklch(70.7% 0.132 254.9)
-
Step 500
500 (this color)
#378BED
oklch(63.5% 0.168 254.7)
-
Step 600
600
#0071D9
oklch(55.6% 0.181 254.6)
-
Step 700
700
#005FB8
oklch(49.1% 0.16 254.6)
-
Step 800
800
#004D98
oklch(42.6% 0.139 254.8)
-
Step 900
900
#0E417A
oklch(37.7% 0.11 254.8)
-
Step 950
950
#0B2747
oklch(27.1% 0.068 254.1)
#378BED 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) | #5B93F1 | 0.040 |
| Deuteranopia (no green cones) | #3B82EB | 0.023 |
| Tritanopia (no blue cones) | #00A2B0 | 0.127 |
| Achromatopsia (no color) | #8A8A8A | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378BED
#378BED
oklch(63.5% 0.168 254.7)
- #BA7C00
#BA7C00
oklch(63.5% 0.134 74.1)
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 #378BED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.019
- Dodger Blue #1E90FF ΔE 0.028
- Chefchaouen Blue #4895EF ΔE 0.031
- Soft Blue #6488EA ΔE 0.039
- Cornflower Blue #6495ED ΔE 0.051
- Clear Blue #247AFD ΔE 0.055
- Water Blue #0E87CC ΔE 0.056
- Cornflower #6A79F7 ΔE 0.065
Use #378BED 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.