#3F87CC
Closest named color: Water Blue (#0E87CC). oklch(60.9% 0.128 249.9), rgb(63, 135, 204).
Aa
Black text reads best on this color (5.54:1).
About this color
#3F87CC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.128 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.024 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 | #3F87CC |
| RGB | rgb(63, 135, 204) |
| HSL | hsl(209, 58%, 52%) |
| OKLCH | oklch(60.9% 0.128 249.9) |
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 #3F87CC | 3.78:1 | AA large text | Lc -70.6 | Content text, not long reading |
| Black text on #3F87CC | 5.54:1 | AA | Lc 39.0 | Non-text elements, placeholder text |
| #3F87CC text on white | 3.78:1 | AA large text | Lc 65.1 | Content text, not long reading |
| #3F87CC 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
#C8DBF0
oklch(88.4% 0.036 250.9)
-
Step 300
300
#A3C4E8
oklch(80.8% 0.062 250.8)
-
Step 400
400
#6FA5DD
oklch(70.7% 0.1 250.3)
-
Step 500
500 (this color)
#3F87CC
oklch(60.9% 0.128 249.9)
-
Step 600
600
#2276C0
oklch(55.5% 0.139 249.9)
-
Step 700
700
#1363A6
oklch(49.1% 0.129 249.9)
-
Step 800
800
#155187
oklch(42.7% 0.107 250.3)
-
Step 900
900
#19446C
oklch(37.8% 0.083 249.6)
-
Step 950
950
#10283F
oklch(27% 0.053 249.5)
#3F87CC 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) | #688ACF | 0.043 |
| Deuteranopia (no green cones) | #547DCB | 0.031 |
| Tritanopia (no blue cones) | #0097A0 | 0.096 |
| Achromatopsia (no color) | #838383 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F87CC
#3F87CC
oklch(60.9% 0.128 249.9)
- #B37311
#B37311
oklch(60.9% 0.128 69.7)
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 #3F87CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.024
- Cool Blue #4984B8 ΔE 0.030
- Steel Blue #4682B4 ΔE 0.036
- Dark Sky Blue #448EE4 ΔE 0.039
- Windows Blue #3778BF ΔE 0.045
- Off Blue #5684AE ΔE 0.047
- Faded Blue #658CBB ΔE 0.049
- Blue NCS #118AB2 ΔE 0.051
Use #3F87CC 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.