#0387E5
Closest named color: Dark Sky Blue (#448EE4). oklch(61.3% 0.171 249.6), rgb(3, 135, 229).
Aa
Black text reads best on this color (5.60:1).
About this color
#0387E5 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.171 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.037 away. Black text reads best on it, at 5.60:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.60:1 |
| White text | 3.74:1 |
Values
| HEX | #0387E5 |
| RGB | rgb(3, 135, 229) |
| HSL | hsl(205, 97%, 45%) |
| OKLCH | oklch(61.3% 0.171 249.6) |
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 #0387E5 | 3.74:1 | AA large text | Lc -69.8 | Content text, not long reading |
| Black text on #0387E5 | 5.60:1 | AA | Lc 39.8 | Non-text elements, placeholder text |
| #0387E5 text on white | 3.74:1 | AA large text | Lc 64.3 | Content text, not long reading |
| #0387E5 text on black | 5.60:1 | AA | Lc -37.4 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEECFA
oklch(93.7% 0.024 248.1)
-
Step 200
200
#C3DCF7
oklch(88.5% 0.046 250.4)
-
Step 300
300
#97C5F5
oklch(80.8% 0.084 250)
-
Step 400
400
#59A6F0
oklch(70.8% 0.133 249.4)
-
Step 500
500 (this color)
#0387E5
oklch(61.3% 0.171 249.6)
-
Step 600
600
#0076CA
oklch(55.7% 0.156 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#004377
oklch(37.7% 0.106 249.9)
-
Step 950
950
#042847
oklch(27.1% 0.07 249.3)
#0387E5 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) | #578DE9 | 0.052 |
| Deuteranopia (no green cones) | #317CE3 | 0.030 |
| Tritanopia (no blue cones) | #009EAB | 0.123 |
| Achromatopsia (no color) | #848484 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0387E5
#0387E5
oklch(61.3% 0.171 249.6)
- #B67300
#B67300
oklch(61.3% 0.133 69.7)
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 #0387E5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.037
- Water Blue #0E87CC ΔE 0.038
- Dodger Blue #1E90FF ΔE 0.045
- Clear Blue #247AFD ΔE 0.052
- Chefchaouen Blue #4895EF ΔE 0.055
- Soft Blue #6488EA ΔE 0.062
- Windows Blue #3778BF ΔE 0.064
- Cerulean Blue #056EEE ΔE 0.068
Use #0387E5 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.