#3F8CEA
Closest named color: Dark Sky Blue (#448EE4). oklch(63.8% 0.16 255.1), rgb(63, 140, 234).
Aa
Black text reads best on this color (6.15:1).
About this color
#3F8CEA is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.160 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.012 away. Black text reads best on it, at 6.15:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.15:1 |
| White text | 3.41:1 |
Values
| HEX | #3F8CEA |
| RGB | rgb(63, 140, 234) |
| HSL | hsl(213, 80%, 58%) |
| OKLCH | oklch(63.8% 0.16 255.1) |
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 #3F8CEA | 3.41:1 | AA large text | Lc -66.7 | Content text, not long reading |
| Black text on #3F8CEA | 6.15:1 | AA | Lc 42.8 | Non-text elements, placeholder text |
| #3F8CEA text on white | 3.41:1 | AA large text | Lc 61.3 | Content text, not long reading |
| #3F8CEA text on black | 6.15:1 | AA | Lc -40.4 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF6
oklch(88.4% 0.044 254.8)
-
Step 300
300
#9FC4F3
oklch(81% 0.078 254.6)
-
Step 400
400
#69A3ED
oklch(70.7% 0.125 255.1)
-
Step 500
500 (this color)
#3F8CEA
oklch(63.8% 0.16 255.1)
-
Step 600
600
#1371D6
oklch(55.5% 0.175 255.2)
-
Step 700
700
#005EB9
oklch(49% 0.162 255.1)
-
Step 800
800
#094E96
oklch(42.8% 0.134 254.9)
-
Step 900
900
#134177
oklch(37.6% 0.104 255.1)
-
Step 950
950
#0D2746
oklch(27.1% 0.066 254.6)
#3F8CEA 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) | #5F93EE | 0.037 |
| Deuteranopia (no green cones) | #4384E8 | 0.021 |
| Tritanopia (no blue cones) | #00A2B0 | 0.123 |
| Achromatopsia (no color) | #8B8B8B | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F8CEA
#3F8CEA
oklch(63.8% 0.16 255.1)
- #BA7E00
#BA7E00
oklch(63.8% 0.134 75.5)
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 #3F8CEA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.012
- Chefchaouen Blue #4895EF ΔE 0.026
- Dodger Blue #1E90FF ΔE 0.033
- Soft Blue #6488EA ΔE 0.034
- Cornflower Blue #6495ED ΔE 0.044
- Water Blue #0E87CC ΔE 0.055
- Clear Blue #247AFD ΔE 0.062
- Cornflower #6A79F7 ΔE 0.065
Use #3F8CEA 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.