#3F85DD
Closest named color: Dark Sky Blue (#448EE4). oklch(61.5% 0.151 255.5), rgb(63, 133, 221).
Aa
Black text reads best on this color (5.61:1).
About this color
#3F85DD is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.151 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.026 away. Black text reads best on it, at 5.61:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.61:1 |
| White text | 3.74:1 |
Values
| HEX | #3F85DD |
| RGB | rgb(63, 133, 221) |
| HSL | hsl(213, 70%, 56%) |
| OKLCH | oklch(61.5% 0.151 255.5) |
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 #3F85DD | 3.74:1 | AA large text | Lc -70.1 | Content text, not long reading |
| Black text on #3F85DD | 5.61:1 | AA | Lc 39.4 | Non-text elements, placeholder text |
| #3F85DD text on white | 3.74:1 | AA large text | Lc 64.6 | Content text, not long reading |
| #3F85DD text on black | 5.61:1 | AA | Lc -37.0 | 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
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A1C3F0
oklch(80.8% 0.074 255.6)
-
Step 400
400
#6DA3E9
oklch(70.7% 0.118 255.4)
-
Step 500
500 (this color)
#3F85DD
oklch(61.5% 0.151 255.5)
-
Step 600
600
#2172D0
oklch(55.6% 0.164 255.3)
-
Step 700
700
#135FB5
oklch(49.2% 0.153 255.6)
-
Step 800
800
#144E92
oklch(42.7% 0.126 255.5)
-
Step 900
900
#184174
oklch(37.5% 0.099 255.6)
-
Step 950
950
#0F2744
oklch(27% 0.062 254.6)
#3F85DD 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) | #5C8CE1 | 0.036 |
| Deuteranopia (no green cones) | #427DDB | 0.021 |
| Tritanopia (no blue cones) | #009AA6 | 0.119 |
| Achromatopsia (no color) | #848484 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F85DD
#3F85DD
oklch(61.5% 0.151 255.5)
- #B17800
#B17800
oklch(61.6% 0.13 75.7)
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 #3F85DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.026
- Water Blue #0E87CC ΔE 0.038
- Soft Blue #6488EA ΔE 0.043
- Chefchaouen Blue #4895EF ΔE 0.049
- Dodger Blue #1E90FF ΔE 0.054
- Windows Blue #3778BF ΔE 0.055
- Cool Blue #4984B8 ΔE 0.057
- Steel Blue #4682B4 ΔE 0.062
Use #3F85DD 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.