#3388BB
Closest named color: Cool Blue (#4984B8). oklch(59.9% 0.112 239.2), rgb(51, 136, 187).
Aa
Black text reads best on this color (5.37:1).
About this color
#3388BB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.112 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.018 away. Black text reads best on it, at 5.37:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.37:1 |
| White text | 3.90:1 |
Values
| HEX | #3388BB |
| RGB | rgb(51, 136, 187) |
| HSL | hsl(203, 57%, 47%) |
| OKLCH | oklch(59.9% 0.112 239.2) |
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 #3388BB | 3.90:1 | AA large text | Lc -71.7 | Content text, not long reading |
| Black text on #3388BB | 5.37:1 | AA | Lc 37.9 | Non-text elements, placeholder text |
| #3388BB text on white | 3.90:1 | AA large text | Lc 66.1 | Content text, not long reading |
| #3388BB text on black | 5.37:1 | AA | Lc -35.5 | 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
#C8DCEB
oklch(88.4% 0.03 240.2)
-
Step 300
300
#A1C6E1
oklch(80.9% 0.055 240)
-
Step 400
400
#6BA8D1
oklch(70.6% 0.087 239.1)
-
Step 500
500 (this color)
#3388BB
oklch(59.9% 0.112 239.2)
-
Step 600
600
#0F7BB2
oklch(55.5% 0.122 239.3)
-
Step 700
700
#006898
oklch(49.2% 0.11 238.7)
-
Step 800
800
#07557C
oklch(42.8% 0.093 238.7)
-
Step 900
900
#144664
oklch(37.7% 0.073 239.6)
-
Step 950
950
#0E293A
oklch(26.9% 0.046 239.3)
#3388BB 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) | #7088BD | 0.060 |
| Deuteranopia (no green cones) | #5E7BBA | 0.049 |
| Tritanopia (no blue cones) | #00959A | 0.075 |
| Achromatopsia (no color) | #818181 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3388BB
#3388BB
oklch(59.9% 0.112 239.2)
- #B06E34
#B06E34
oklch(59.9% 0.111 59.3)
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 #3388BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.018
- Steel Blue #4682B4 ΔE 0.020
- Blue NCS #118AB2 ΔE 0.023
- Water Blue #0E87CC ΔE 0.030
- Off Blue #5684AE ΔE 0.033
- Dusty Blue #5A86AD ΔE 0.037
- Windows Blue #3778BF ΔE 0.047
- Nice Blue #107AB0 ΔE 0.048
Use #3388BB 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.