#388CDB
Closest named color: Dark Sky Blue (#448EE4). oklch(62.7% 0.144 250.1), rgb(56, 140, 219).
Aa
Black text reads best on this color (5.94:1).
About this color
#388CDB is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.144 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.018 away. Black text reads best on it, at 5.94:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.94:1 |
| White text | 3.53:1 |
Values
| HEX | #388CDB |
| RGB | rgb(56, 140, 219) |
| HSL | hsl(209, 69%, 54%) |
| OKLCH | oklch(62.7% 0.144 250.1) |
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 #388CDB | 3.53:1 | AA large text | Lc -68.0 | Content text, not long reading |
| Black text on #388CDB | 5.94:1 | AA | Lc 41.5 | Non-text elements, placeholder text |
| #388CDB text on white | 3.53:1 | AA large text | Lc 62.6 | Content text, not long reading |
| #388CDB text on black | 5.94:1 | AA | Lc -39.1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF3
oklch(88.5% 0.04 249.5)
-
Step 300
300
#9FC5ED
oklch(81% 0.07 250)
-
Step 400
400
#68A5E4
oklch(70.6% 0.113 250.4)
-
Step 500
500 (this color)
#388CDB
oklch(62.7% 0.144 250.1)
-
Step 600
600
#0576CA
oklch(55.7% 0.156 250)
-
Step 700
700
#0063AC
oklch(49.2% 0.139 250)
-
Step 800
800
#02518D
oklch(42.8% 0.119 249.8)
-
Step 900
900
#114371
oklch(37.6% 0.094 250.6)
-
Step 950
950
#0C2842
oklch(27.1% 0.059 249.5)
#388CDB 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) | #6790DE | 0.046 |
| Deuteranopia (no green cones) | #4F81D9 | 0.032 |
| Tritanopia (no blue cones) | #009FA9 | 0.107 |
| Achromatopsia (no color) | #888888 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #388CDB
#388CDB
oklch(62.7% 0.144 250.1)
- #BB7700
#BB7700
oklch(62.6% 0.136 70.2)
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 #388CDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.018
- Water Blue #0E87CC ΔE 0.034
- Chefchaouen Blue #4895EF ΔE 0.040
- Soft Blue #6488EA ΔE 0.048
- Cool Blue #4984B8 ΔE 0.053
- Dodger Blue #1E90FF ΔE 0.053
- Cornflower Blue #6495ED ΔE 0.055
- Steel Blue #4682B4 ΔE 0.060
Use #388CDB 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.