#378FFF
Closest named color: Dodger Blue (#1E90FF). oklch(65.5% 0.186 256.3), rgb(55, 143, 255).
Aa
Black text reads best on this color (6.53:1).
About this color
#378FFF is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.186 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dodger Blue (#1E90FF), ΔE 0.011 away. Black text reads best on it, at 6.53:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.186) |
| Temperature | cool |
| Nearest name | Dodger Blue (#1E90FF) |
| Black text | 6.53:1 |
| White text | 3.21:1 |
Values
| HEX | #378FFF |
| RGB | rgb(55, 143, 255) |
| HSL | hsl(214, 100%, 61%) |
| OKLCH | oklch(65.5% 0.186 256.3) |
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 #378FFF | 3.21:1 | AA large text | Lc -64.3 | Content text, not long reading |
| Black text on #378FFF | 6.53:1 | AA | Lc 45.2 | Large or bold text, headings |
| #378FFF text on white | 3.21:1 | AA large text | Lc 58.9 | Large or bold text, headings |
| #378FFF text on black | 6.53:1 | AA | Lc -42.9 | 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
#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
#9AC3FB
oklch(80.8% 0.091 256.3)
-
Step 400
400
#61A2F9
oklch(70.7% 0.145 256.2)
-
Step 500
500 (this color)
#378FFF
oklch(65.5% 0.186 256.3)
-
Step 600
600
#006FE0
oklch(55.6% 0.192 256.3)
-
Step 700
700
#005DBE
oklch(49.2% 0.17 256.3)
-
Step 800
800
#004C9D
oklch(42.8% 0.147 256.2)
-
Step 900
900
#094080
oklch(37.8% 0.121 256.1)
-
Step 950
950
#09264B
oklch(27.1% 0.077 256.3)
#378FFF 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) | #5599FF | 0.038 |
| Deuteranopia (no green cones) | #2987FD | 0.024 |
| Tritanopia (no blue cones) | #00AABB | 0.142 |
| Achromatopsia (no color) | #8F8F8F | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #378FFF
#378FFF
oklch(65.5% 0.186 256.3)
- #C08300
#C08300
oklch(65.5% 0.138 76.1)
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 #378FFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dodger Blue #1E90FF ΔE 0.011
- Chefchaouen Blue #4895EF ΔE 0.033
- Dark Sky Blue #448EE4 ΔE 0.040
- Soft Blue #6488EA ΔE 0.047
- Cornflower Blue #6495ED ΔE 0.051
- Clear Blue #247AFD ΔE 0.057
- Cornflower #6A79F7 ΔE 0.065
- Water Blue #0E87CC ΔE 0.082
Use #378FFF 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.