#387CD0
Closest named color: Windows Blue (#3778BF). oklch(58.5% 0.146 255.3), rgb(56, 124, 208).
Aa
Black text reads best on this color (4.96:1).
About this color
#387CD0 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.146 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.027 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.96:1 |
| White text | 4.23:1 |
Values
| HEX | #387CD0 |
| RGB | rgb(56, 124, 208) |
| HSL | hsl(213, 62%, 52%) |
| OKLCH | oklch(58.5% 0.146 255.3) |
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 #387CD0 | 4.23:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #387CD0 | 4.96:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #387CD0 text on white | 4.23:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #387CD0 text on black | 4.96:1 | AA | Lc -32.8 | 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 600.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADBF2
oklch(88.6% 0.037 256)
-
Step 300
300
#A5C3EB
oklch(80.9% 0.066 255.7)
-
Step 400
400
#73A3E1
oklch(70.6% 0.105 255.2)
-
Step 500
500
#4D8BD9
oklch(63.1% 0.135 255.1)
-
Step 600
600 (this color)
#387CD0
oklch(58.5% 0.146 255.3)
-
Step 700
700
#2160AC
oklch(49.1% 0.137 255.5)
-
Step 800
800
#1E4F8B
oklch(42.7% 0.113 255.4)
-
Step 900
900
#1E426F
oklch(37.7% 0.088 255.3)
-
Step 950
950
#122741
oklch(27% 0.056 254.8)
#387CD0 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) | #5483D3 | 0.035 |
| Deuteranopia (no green cones) | #3B75CE | 0.018 |
| Tritanopia (no blue cones) | #00909C | 0.113 |
| Achromatopsia (no color) | #7B7B7B | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #387CD0
#387CD0
oklch(58.5% 0.146 255.3)
- #A56F00
#A56F00
oklch(58.4% 0.123 75.3)
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 #387CD0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.027
- Water Blue #0E87CC ΔE 0.035
- Cool Blue #4984B8 ΔE 0.050
- Steel Blue #4682B4 ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.056
- Nice Blue #107AB0 ΔE 0.056
- Royal Blue #4169E1 ΔE 0.058
- Flat Blue #3C73A8 ΔE 0.063
Use #387CD0 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.