#3F80CB
Closest named color: Water Blue (#0E87CC). oklch(59.3% 0.133 253.7), rgb(63, 128, 203).
Aa
Black text reads best on this color (5.16:1).
About this color
#3F80CB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.133 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.028 away. Black text reads best on it, at 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.16:1 |
| White text | 4.06:1 |
Values
| HEX | #3F80CB |
| RGB | rgb(63, 128, 203) |
| HSL | hsl(212, 57%, 52%) |
| OKLCH | oklch(59.3% 0.133 253.7) |
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 #3F80CB | 4.06:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #3F80CB | 5.16:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #3F80CB text on white | 4.06:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #3F80CB text on black | 5.16:1 | AA | Lc -34.1 | 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 600.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CADBEF
oklch(88.5% 0.033 252.5)
-
Step 300
300
#A6C3E7
oklch(80.8% 0.06 254)
-
Step 400
400
#76A4DB
oklch(70.7% 0.095 253.4)
-
Step 500
500
#518CD2
oklch(63.1% 0.123 253.8)
-
Step 600
600 (this color)
#3F80CB
oklch(59.3% 0.133 253.7)
-
Step 700
700
#2662A5
oklch(49.2% 0.124 253.7)
-
Step 800
800
#215085
oklch(42.7% 0.102 253.6)
-
Step 900
900
#20436B
oklch(37.8% 0.08 253.3)
-
Step 950
950
#14273F
oklch(27% 0.052 255)
#3F80CB 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) | #5E85CE | 0.036 |
| Deuteranopia (no green cones) | #4A78C9 | 0.022 |
| Tritanopia (no blue cones) | #00919C | 0.103 |
| Achromatopsia (no color) | #7E7E7E | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F80CB
#3F80CB
oklch(59.3% 0.133 253.7)
- #AA7100
#AA7100
oklch(59.4% 0.126 74.1)
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 #3F80CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.028
- Windows Blue #3778BF ΔE 0.029
- Cool Blue #4984B8 ΔE 0.035
- Steel Blue #4682B4 ΔE 0.038
- Dark Sky Blue #448EE4 ΔE 0.050
- Off Blue #5684AE ΔE 0.053
- Nice Blue #107AB0 ΔE 0.054
- Blue NCS #118AB2 ΔE 0.058
Use #3F80CB 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.