#3F8AEF
Closest named color: Dark Sky Blue (#448EE4). oklch(63.7% 0.169 256.9), rgb(63, 138, 239).
Aa
Black text reads best on this color (6.09:1).
About this color
#3F8AEF is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.169 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.022 away. Black text reads best on it, at 6.09:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.09:1 |
| White text | 3.44:1 |
Values
| HEX | #3F8AEF |
| RGB | rgb(63, 138, 239) |
| HSL | hsl(214, 85%, 59%) |
| OKLCH | oklch(63.7% 0.169 256.9) |
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 #3F8AEF | 3.44:1 | AA large text | Lc -67.1 | Content text, not long reading |
| Black text on #3F8AEF | 6.09:1 | AA | Lc 42.5 | Non-text elements, placeholder text |
| #3F8AEF text on white | 3.44:1 | AA large text | Lc 61.6 | Content text, not long reading |
| #3F8AEF text on black | 6.09:1 | AA | Lc -40.1 | 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
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF8
oklch(88.5% 0.046 256.5)
-
Step 300
300
#9FC3F6
oklch(80.9% 0.082 257.1)
-
Step 400
400
#69A2F2
oklch(70.7% 0.132 257)
-
Step 500
500 (this color)
#3F8AEF
oklch(63.7% 0.169 256.9)
-
Step 600
600
#166FDB
oklch(55.5% 0.183 256.9)
-
Step 700
700
#045CBE
oklch(49% 0.171 256.9)
-
Step 800
800
#0B4C9A
oklch(42.7% 0.141 256.8)
-
Step 900
900
#14407A
oklch(37.6% 0.11 256.9)
-
Step 950
950
#0D2648
oklch(27% 0.07 257)
#3F8AEF 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) | #5893F3 | 0.035 |
| Deuteranopia (no green cones) | #3883ED | 0.020 |
| Tritanopia (no blue cones) | #00A2B1 | 0.131 |
| Achromatopsia (no color) | #8A8A8A | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F8AEF
#3F8AEF
oklch(63.7% 0.169 256.9)
- #B87E00
#B87E00
oklch(63.6% 0.133 76.5)
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 #3F8AEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.022
- Dodger Blue #1E90FF ΔE 0.029
- Chefchaouen Blue #4895EF ΔE 0.032
- Soft Blue #6488EA ΔE 0.034
- Cornflower Blue #6495ED ΔE 0.048
- Clear Blue #247AFD ΔE 0.053
- Cornflower #6A79F7 ΔE 0.058
- Water Blue #0E87CC ΔE 0.061
Use #3F8AEF 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.