#3788CB
Closest named color: Water Blue (#0E87CC). oklch(60.8% 0.128 247.1), rgb(55, 136, 203).
Aa
Black text reads best on this color (5.54:1).
About this color
#3788CB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.128 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.019 away. Black text reads best on it, at 5.54:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.54:1 |
| White text | 3.78:1 |
Values
| HEX | #3788CB |
| RGB | rgb(55, 136, 203) |
| HSL | hsl(207, 59%, 51%) |
| OKLCH | oklch(60.8% 0.128 247.1) |
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 #3788CB | 3.78:1 | AA large text | Lc -70.6 | Content text, not long reading |
| Black text on #3788CB | 5.54:1 | AA | Lc 39.0 | Non-text elements, placeholder text |
| #3788CB text on white | 3.78:1 | AA large text | Lc 65.1 | Content text, not long reading |
| #3788CB text on black | 5.54:1 | AA | Lc -36.6 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C7DCF0
oklch(88.5% 0.036 246.9)
-
Step 300
300
#A0C5E8
oklch(80.9% 0.064 247.2)
-
Step 400
400
#6BA6DC
oklch(70.6% 0.101 247.3)
-
Step 500
500 (this color)
#3788CB
oklch(60.8% 0.128 247.1)
-
Step 600
600
#1378C0
oklch(55.7% 0.14 247)
-
Step 700
700
#0064A5
oklch(49% 0.13 247.2)
-
Step 800
800
#095286
oklch(42.7% 0.108 247.1)
-
Step 900
900
#14446B
oklch(37.6% 0.084 247.3)
-
Step 950
950
#0E283F
oklch(26.9% 0.054 248)
#3788CB 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) | #698BCE | 0.050 |
| Deuteranopia (no green cones) | #557DCA | 0.036 |
| Tritanopia (no blue cones) | #0098A0 | 0.094 |
| Achromatopsia (no color) | #838383 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3788CB
#3788CB
oklch(60.8% 0.128 247.1)
- #B57114
#B57114
oklch(60.8% 0.129 66.9)
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 #3788CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.019
- Cool Blue #4984B8 ΔE 0.030
- Steel Blue #4682B4 ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.042
- Windows Blue #3778BF ΔE 0.045
- Blue NCS #118AB2 ΔE 0.046
- Off Blue #5684AE ΔE 0.048
- Faded Blue #658CBB ΔE 0.051
Use #3788CB 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.