#3B8BCB
Closest named color: Water Blue (#0E87CC). oklch(61.7% 0.124 246), rgb(59, 139, 203).
Aa
Black text reads best on this color (5.74:1).
About this color
#3B8BCB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.124 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.025 away. Black text reads best on it, at 5.74:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.74:1 |
| White text | 3.65:1 |
Values
| HEX | #3B8BCB |
| RGB | rgb(59, 139, 203) |
| HSL | hsl(207, 58%, 51%) |
| OKLCH | oklch(61.7% 0.124 246) |
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 #3B8BCB | 3.65:1 | AA large text | Lc -69.4 | Content text, not long reading |
| Black text on #3B8BCB | 5.74:1 | AA | Lc 40.2 | Non-text elements, placeholder text |
| #3B8BCB text on white | 3.65:1 | AA large text | Lc 63.9 | Content text, not long reading |
| #3B8BCB text on black | 5.74:1 | AA | Lc -37.8 | 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
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEF
oklch(88.5% 0.034 246.8)
-
Step 300
300
#A1C5E6
oklch(80.8% 0.061 246.3)
-
Step 400
400
#6CA7DA
oklch(70.8% 0.097 245.8)
-
Step 500
500 (this color)
#3B8BCB
oklch(61.7% 0.124 246)
-
Step 600
600
#1678BD
oklch(55.5% 0.136 246.3)
-
Step 700
700
#0165A3
oklch(49.1% 0.126 246)
-
Step 800
800
#0B5384
oklch(42.8% 0.104 245.7)
-
Step 900
900
#15456A
oklch(37.8% 0.081 245.9)
-
Step 950
950
#0E283E
oklch(26.9% 0.052 246.9)
#3B8BCB 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) | #6E8DCE | 0.051 |
| Deuteranopia (no green cones) | #5A80CA | 0.038 |
| Tritanopia (no blue cones) | #009AA2 | 0.090 |
| Achromatopsia (no color) | #868686 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B8BCB
#3B8BCB
oklch(61.7% 0.124 246)
- #B77422
#B77422
oklch(61.7% 0.124 66)
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 #3B8BCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.025
- Cool Blue #4984B8 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.038
- Dark Sky Blue #448EE4 ΔE 0.039
- Faded Blue #658CBB ΔE 0.045
- Blue NCS #118AB2 ΔE 0.046
- Off Blue #5684AE ΔE 0.047
- Dusty Blue #5A86AD ΔE 0.049
Use #3B8BCB 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.