#3F82CB
Closest named color: Water Blue (#0E87CC). oklch(59.8% 0.131 252.6), rgb(63, 130, 203).
Aa
Black text reads best on this color (5.26:1).
About this color
#3F82CB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.131 and its hue 253°. 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 5.26:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.26:1 |
| White text | 3.98:1 |
Values
| HEX | #3F82CB |
| RGB | rgb(63, 130, 203) |
| HSL | hsl(211, 57%, 52%) |
| OKLCH | oklch(59.8% 0.131 252.6) |
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 #3F82CB | 3.98:1 | AA large text | Lc -72.4 | Content text, not long reading |
| Black text on #3F82CB | 5.26:1 | AA | Lc 37.2 | Non-text elements, placeholder text |
| #3F82CB text on white | 3.98:1 | AA large text | Lc 66.9 | Content text, not long reading |
| #3F82CB text on black | 5.26:1 | AA | Lc -34.7 | 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
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A3C4EA
oklch(80.9% 0.065 252.2)
-
Step 400
400
#71A4DF
oklch(70.6% 0.103 252.8)
-
Step 500
500 (this color)
#3F82CB
oklch(59.8% 0.131 252.6)
-
Step 600
600
#2975C4
oklch(55.7% 0.143 252.7)
-
Step 700
700
#1A62A9
oklch(49.2% 0.133 252.4)
-
Step 800
800
#195089
oklch(42.7% 0.11 252.7)
-
Step 900
900
#1C436D
oklch(37.7% 0.085 252.5)
-
Step 950
950
#112740
oklch(26.9% 0.055 253.1)
#3F82CB 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) | #6187CE | 0.039 |
| Deuteranopia (no green cones) | #4D79CA | 0.026 |
| Tritanopia (no blue cones) | #00939D | 0.101 |
| Achromatopsia (no color) | #7F7F7F | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F82CB
#3F82CB
oklch(59.8% 0.131 252.6)
- #AD7100
#AD7100
oklch(59.8% 0.128 72.6)
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 #3F82CB, 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 0.032
- Windows Blue #3778BF ΔE 0.033
- Steel Blue #4682B4 ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.047
- Off Blue #5684AE ΔE 0.050
- Blue NCS #118AB2 ΔE 0.055
- Nice Blue #107AB0 ΔE 0.056
Use #3F82CB 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.