#387FB8
Closest named color: Steel Blue (#4682B4). oklch(57.8% 0.113 245.8), rgb(56, 127, 184).
Aa
Black text reads best on this color (4.89:1).
About this color
#387FB8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.113 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.017 away. Black text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.89:1 |
| White text | 4.28:1 |
Values
| HEX | #387FB8 |
| RGB | rgb(56, 127, 184) |
| HSL | hsl(207, 53%, 47%) |
| OKLCH | oklch(57.8% 0.113 245.8) |
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 #387FB8 | 4.28:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #387FB8 | 4.89:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #387FB8 text on white | 4.28:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #387FB8 text on black | 4.89:1 | AA | Lc -32.3 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CBDCEB
oklch(88.6% 0.028 244.7)
-
Step 300
300
#A6C5E0
oklch(81% 0.051 244.8)
-
Step 400
400
#76A6D1
oklch(70.7% 0.082 246.3)
-
Step 500
500
#508FC4
oklch(63% 0.103 245.8)
-
Step 600
600 (this color)
#387FB8
oklch(57.8% 0.113 245.8)
-
Step 700
700
#236598
oklch(49.1% 0.105 245.9)
-
Step 800
800
#1F537B
oklch(42.7% 0.086 245.2)
-
Step 900
900
#1F4563
oklch(37.8% 0.067 244.8)
-
Step 950
950
#13283A
oklch(26.9% 0.043 246.2)
#387FB8 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) | #6581BA | 0.047 |
| Deuteranopia (no green cones) | #5475B7 | 0.035 |
| Tritanopia (no blue cones) | #008D93 | 0.084 |
| Achromatopsia (no color) | #7A7A7A | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #387FB8
#387FB8
oklch(57.8% 0.113 245.8)
- #A66A23
#A66A23
oklch(57.7% 0.113 65.9)
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 #387FB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.017
- Cool Blue #4984B8 ΔE 0.022
- Windows Blue #3778BF ΔE 0.025
- Nice Blue #107AB0 ΔE 0.030
- Water Blue #0E87CC ΔE 0.035
- Off Blue #5684AE ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.038
- Blue NCS #118AB2 ΔE 0.038
Use #387FB8 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.