#3F87CF
Closest named color: Water Blue (#0E87CC). oklch(61.1% 0.131 250.8), rgb(63, 135, 207).
Aa
Black text reads best on this color (5.57:1).
About this color
#3F87CF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.131 and its hue 251°. 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 5.57:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.57:1 |
| White text | 3.76:1 |
Values
| HEX | #3F87CF |
| RGB | rgb(63, 135, 207) |
| HSL | hsl(210, 60%, 53%) |
| OKLCH | oklch(61.1% 0.131 250.8) |
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 #3F87CF | 3.76:1 | AA large text | Lc -70.4 | Content text, not long reading |
| Black text on #3F87CF | 5.57:1 | AA | Lc 39.2 | Non-text elements, placeholder text |
| #3F87CF text on white | 3.76:1 | AA large text | Lc 64.9 | Content text, not long reading |
| #3F87CF text on black | 5.57:1 | AA | Lc -36.8 | 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
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DBF1
oklch(88.4% 0.037 252.1)
-
Step 300
300
#A2C4E9
oklch(80.8% 0.064 250.8)
-
Step 400
400
#6FA5DF
oklch(70.8% 0.103 251.1)
-
Step 500
500 (this color)
#3F87CF
oklch(61.1% 0.131 250.8)
-
Step 600
600
#2276C3
oklch(55.7% 0.142 250.8)
-
Step 700
700
#1363A8
oklch(49.2% 0.132 250.5)
-
Step 800
800
#145188
oklch(42.7% 0.109 250.5)
-
Step 900
900
#19436D
oklch(37.6% 0.086 251.2)
-
Step 950
950
#102840
oklch(27.1% 0.054 250.5)
#3F87CF 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) | #678BD2 | 0.043 |
| Deuteranopia (no green cones) | #527DCE | 0.030 |
| Tritanopia (no blue cones) | #0098A1 | 0.101 |
| Achromatopsia (no color) | #848484 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F87CF
#3F87CF
oklch(61.1% 0.131 250.8)
- #B47302
#B47302
oklch(61% 0.131 70.5)
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 #3F87CF, 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 0.035
- Dark Sky Blue #448EE4 ΔE 0.035
- Steel Blue #4682B4 ΔE 0.041
- Windows Blue #3778BF ΔE 0.046
- Off Blue #5684AE ΔE 0.052
- Faded Blue #658CBB ΔE 0.052
- Blue NCS #118AB2 ΔE 0.055
Use #3F87CF 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.