#3990EE
Closest named color: Dark Sky Blue (#448EE4). oklch(64.7% 0.163 253.2), rgb(57, 144, 238).
Aa
Black text reads best on this color (6.39:1).
About this color
#3990EE is a medium-light, vivid blue. In OKLCH its lightness is 65%, its chroma 0.163 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.016 away. Black text reads best on it, at 6.39:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.39:1 |
| White text | 3.28:1 |
Values
| HEX | #3990EE |
| RGB | rgb(57, 144, 238) |
| HSL | hsl(211, 84%, 58%) |
| OKLCH | oklch(64.7% 0.163 253.2) |
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 #3990EE | 3.28:1 | AA large text | Lc -65.2 | Content text, not long reading |
| Black text on #3990EE | 6.39:1 | AA | Lc 44.3 | Non-text elements, placeholder text |
| #3990EE text on white | 3.28:1 | AA large text | Lc 59.8 | Large or bold text, headings |
| #3990EE text on black | 6.39:1 | AA | Lc -42.0 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF6
oklch(88.6% 0.044 251.5)
-
Step 300
300
#9CC4F4
oklch(80.9% 0.081 253.3)
-
Step 400
400
#64A4EE
oklch(70.7% 0.128 253.1)
-
Step 500
500 (this color)
#3990EE
oklch(64.7% 0.163 253.2)
-
Step 600
600
#0073D4
oklch(55.6% 0.172 253.1)
-
Step 700
700
#0060B3
oklch(49% 0.152 253.2)
-
Step 800
800
#004F94
oklch(42.8% 0.131 252.8)
-
Step 900
900
#0C4278
oklch(37.7% 0.106 253.1)
-
Step 950
950
#0A2746
oklch(27% 0.067 252.9)
#3990EE 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) | #6397F2 | 0.043 |
| Deuteranopia (no green cones) | #4586EC | 0.026 |
| Tritanopia (no blue cones) | #00A6B3 | 0.123 |
| Achromatopsia (no color) | #8E8E8E | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3990EE
#3990EE
oklch(64.7% 0.163 253.2)
- #C07F00
#C07F00
oklch(64.8% 0.138 73.3)
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 #3990EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.016
- Chefchaouen Blue #4895EF ΔE 0.019
- Dodger Blue #1E90FF ΔE 0.027
- Soft Blue #6488EA ΔE 0.039
- Cornflower Blue #6495ED ΔE 0.041
- Water Blue #0E87CC ΔE 0.060
- Clear Blue #247AFD ΔE 0.067
- Cornflower #6A79F7 ΔE 0.072
Use #3990EE 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.