#388CBB
Closest named color: Cool Blue (#4984B8). oklch(61% 0.107 236.9), rgb(56, 140, 187).
Aa
Black text reads best on this color (5.63:1).
About this color
#388CBB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.107 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.024 away. Black text reads best on it, at 5.63:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.63:1 |
| White text | 3.72:1 |
Values
| HEX | #388CBB |
| RGB | rgb(56, 140, 187) |
| HSL | hsl(202, 54%, 48%) |
| OKLCH | oklch(61% 0.107 236.9) |
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 #388CBB | 3.72:1 | AA large text | Lc -70.0 | Content text, not long reading |
| Black text on #388CBB | 5.63:1 | AA | Lc 39.5 | Non-text elements, placeholder text |
| #388CBB text on white | 3.72:1 | AA large text | Lc 64.5 | Content text, not long reading |
| #388CBB text on black | 5.63:1 | AA | Lc -37.1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C8DDEA
oklch(88.6% 0.029 234.9)
-
Step 300
300
#A1C6DF
oklch(80.8% 0.053 237.9)
-
Step 400
400
#6CA9CE
oklch(70.7% 0.083 236.3)
-
Step 500
500 (this color)
#388CBB
oklch(61% 0.107 236.9)
-
Step 600
600
#127CAE
oklch(55.6% 0.116 236.7)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#08557A
oklch(42.7% 0.09 237.4)
-
Step 900
900
#144762
oklch(37.8% 0.07 236.4)
-
Step 950
950
#0E2939
oklch(26.8% 0.044 237.6)
#388CBB 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) | #768BBD | 0.062 |
| Deuteranopia (no green cones) | #647FBA | 0.051 |
| Tritanopia (no blue cones) | #00989C | 0.071 |
| Achromatopsia (no color) | #848484 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #388CBB
#388CBB
oklch(61% 0.107 236.9)
- #B3713E
#B3713E
oklch(60.9% 0.107 56.7)
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 #388CBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.024
- Blue NCS #118AB2 ΔE 0.025
- Steel Blue #4682B4 ΔE 0.028
- Off Blue #5684AE ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.034
- Water Blue #0E87CC ΔE 0.038
- Faded Blue #658CBB ΔE 0.042
- Teal Blue #01889F ΔE 0.052
Use #388CBB 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.