#378BFB
Closest named color: Dodger Blue (#1E90FF). oklch(64.4% 0.185 257), rgb(55, 139, 251).
Aa
Black text reads best on this color (6.24:1).
About this color
#378BFB is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.185 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dodger Blue (#1E90FF), ΔE 0.016 away. Black text reads best on it, at 6.24:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Dodger Blue (#1E90FF) |
| Black text | 6.24:1 |
| White text | 3.36:1 |
Values
| HEX | #378BFB |
| RGB | rgb(55, 139, 251) |
| HSL | hsl(214, 96%, 60%) |
| OKLCH | oklch(64.4% 0.185 257) |
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 #378BFB | 3.36:1 | AA large text | Lc -66.0 | Content text, not long reading |
| Black text on #378BFB | 6.24:1 | AA | Lc 43.5 | Non-text elements, placeholder text |
| #378BFB text on white | 3.36:1 | AA large text | Lc 60.6 | Content text, not long reading |
| #378BFB text on black | 6.24:1 | AA | Lc -41.1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C4DBFB
oklch(88.5% 0.051 256.7)
-
Step 300
300
#9BC3FB
oklch(80.9% 0.091 256.9)
-
Step 400
400
#63A1F9
oklch(70.6% 0.145 257.3)
-
Step 500
500 (this color)
#378BFB
oklch(64.4% 0.185 257)
-
Step 600
600
#006EE3
oklch(55.7% 0.197 256.9)
-
Step 700
700
#005CC0
oklch(49.1% 0.174 256.9)
-
Step 800
800
#004B9F
oklch(42.7% 0.151 256.9)
-
Step 900
900
#0C3F80
oklch(37.6% 0.122 257.2)
-
Step 950
950
#0A264B
oklch(27.1% 0.076 256.8)
#378BFB 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) | #5096FF | 0.037 |
| Deuteranopia (no green cones) | #2284F9 | 0.023 |
| Tritanopia (no blue cones) | #00A6B7 | 0.142 |
| Achromatopsia (no color) | #8C8C8C | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378BFB
#378BFB
oklch(64.4% 0.185 257)
- #BB8100
#BB8100
oklch(64.5% 0.135 77.1)
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 #378BFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dodger Blue #1E90FF ΔE 0.016
- Dark Sky Blue #448EE4 ΔE 0.038
- Chefchaouen Blue #4895EF ΔE 0.038
- Soft Blue #6488EA ΔE 0.044
- Clear Blue #247AFD ΔE 0.047
- Cornflower Blue #6495ED ΔE 0.055
- Cornflower #6A79F7 ΔE 0.059
- Water Blue #0E87CC ΔE 0.075
Use #378BFB 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.