#3F8EEE
Closest named color: Dark Sky Blue (#448EE4). oklch(64.5% 0.163 255.1), rgb(63, 142, 238).
Aa
Black text reads best on this color (6.31:1).
About this color
#3F8EEE is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.163 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.015 away. Black text reads best on it, at 6.31:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.31:1 |
| White text | 3.32:1 |
Values
| HEX | #3F8EEE |
| RGB | rgb(63, 142, 238) |
| HSL | hsl(213, 84%, 59%) |
| OKLCH | oklch(64.5% 0.163 255.1) |
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 #3F8EEE | 3.32:1 | AA large text | Lc -65.7 | Content text, not long reading |
| Black text on #3F8EEE | 6.31:1 | AA | Lc 43.8 | Non-text elements, placeholder text |
| #3F8EEE text on white | 3.32:1 | AA large text | Lc 60.3 | Content text, not long reading |
| #3F8EEE text on black | 6.31:1 | AA | Lc -41.4 | 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
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9EC4F4
oklch(81% 0.08 254.5)
-
Step 400
400
#67A3EF
oklch(70.7% 0.128 255)
-
Step 500
500 (this color)
#3F8EEE
oklch(64.5% 0.163 255.1)
-
Step 600
600
#0D71D8
oklch(55.6% 0.178 255.2)
-
Step 700
700
#005EB9
oklch(49% 0.162 255.1)
-
Step 800
800
#064D97
oklch(42.6% 0.137 255.2)
-
Step 900
900
#124178
oklch(37.6% 0.106 255.1)
-
Step 950
950
#0C2746
oklch(27.1% 0.066 254)
#3F8EEE 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) | #6096F2 | 0.039 |
| Deuteranopia (no green cones) | #4385EC | 0.023 |
| Tritanopia (no blue cones) | #00A5B2 | 0.127 |
| Achromatopsia (no color) | #8D8D8D | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F8EEE
#3F8EEE
oklch(64.5% 0.163 255.1)
- #BD7F00
#BD7F00
oklch(64.4% 0.136 74.7)
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 #3F8EEE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.015
- Chefchaouen Blue #4895EF ΔE 0.021
- Dodger Blue #1E90FF ΔE 0.028
- Soft Blue #6488EA ΔE 0.034
- Cornflower Blue #6495ED ΔE 0.041
- Water Blue #0E87CC ΔE 0.061
- Clear Blue #247AFD ΔE 0.063
- Cornflower #6A79F7 ΔE 0.066
Use #3F8EEE 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.