#3F87DA
Closest named color: Dark Sky Blue (#448EE4). oklch(61.7% 0.145 253.9), rgb(63, 135, 218).
Aa
Black text reads best on this color (5.68:1).
About this color
#3F87DA is a medium-dark, vivid blue. In OKLCH its lightness is 62%, its chroma 0.145 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.023 away. Black text reads best on it, at 5.68:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.68:1 |
| White text | 3.69:1 |
Values
| HEX | #3F87DA |
| RGB | rgb(63, 135, 218) |
| HSL | hsl(212, 68%, 55%) |
| OKLCH | oklch(61.7% 0.145 253.9) |
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 #3F87DA | 3.69:1 | AA large text | Lc -69.7 | Content text, not long reading |
| Black text on #3F87DA | 5.68:1 | AA | Lc 39.9 | Non-text elements, placeholder text |
| #3F87DA text on white | 3.69:1 | AA large text | Lc 64.2 | Content text, not long reading |
| #3F87DA text on black | 5.68:1 | AA | Lc -37.5 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF3
oklch(88.5% 0.039 254.3)
-
Step 300
300
#A1C4EE
oklch(80.9% 0.071 253.2)
-
Step 400
400
#6DA4E6
oklch(70.8% 0.113 253.7)
-
Step 500
500 (this color)
#3F87DA
oklch(61.7% 0.145 253.9)
-
Step 600
600
#1F73CC
oklch(55.5% 0.158 253.9)
-
Step 700
700
#1060B1
oklch(49.1% 0.147 254)
-
Step 800
800
#124F8F
oklch(42.7% 0.121 253.8)
-
Step 900
900
#184272
oklch(37.7% 0.095 254)
-
Step 950
950
#0F2743
oklch(27% 0.06 253.9)
#3F87DA 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) | #618DDD | 0.038 |
| Deuteranopia (no green cones) | #497ED8 | 0.024 |
| Tritanopia (no blue cones) | #009AA6 | 0.111 |
| Achromatopsia (no color) | #858585 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F87DA
#3F87DA
oklch(61.7% 0.145 253.9)
- #B37700
#B37700
oklch(61.7% 0.131 74)
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 #3F87DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.023
- Water Blue #0E87CC ΔE 0.034
- Soft Blue #6488EA ΔE 0.045
- Chefchaouen Blue #4895EF ΔE 0.047
- Cool Blue #4984B8 ΔE 0.051
- Windows Blue #3778BF ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.057
- Steel Blue #4682B4 ΔE 0.057
Use #3F87DA 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.