#3390ED
Closest named color: Dark Sky Blue (#448EE4). oklch(64.5% 0.164 252), rgb(51, 144, 237).
Aa
Black text reads best on this color (6.35:1).
About this color
#3390ED is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.164 and its hue 252°. 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 6.35:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.35:1 |
| White text | 3.30:1 |
Values
| HEX | #3390ED |
| RGB | rgb(51, 144, 237) |
| HSL | hsl(210, 84%, 56%) |
| OKLCH | oklch(64.5% 0.164 252) |
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 #3390ED | 3.30:1 | AA large text | Lc -65.4 | Content text, not long reading |
| Black text on #3390ED | 6.35:1 | AA | Lc 44.1 | Non-text elements, placeholder text |
| #3390ED text on white | 3.30:1 | AA large text | Lc 60.0 | Large or bold text, headings |
| #3390ED text on black | 6.35:1 | AA | Lc -41.7 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
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
#9BC5F3
oklch(81% 0.079 251.1)
-
Step 400
400
#61A4EE
oklch(70.6% 0.129 252.2)
-
Step 500
500 (this color)
#3390ED
oklch(64.5% 0.164 252)
-
Step 600
600
#0074D0
oklch(55.6% 0.166 251.9)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#004F92
oklch(42.6% 0.129 252.3)
-
Step 900
900
#084278
oklch(37.7% 0.107 252.4)
-
Step 950
950
#092746
oklch(26.9% 0.068 252.4)
#3390ED 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) | #6396F1 | 0.045 |
| Deuteranopia (no green cones) | #4586EB | 0.027 |
| Tritanopia (no blue cones) | #00A6B3 | 0.121 |
| Achromatopsia (no color) | #8D8D8D | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3390ED
#3390ED
oklch(64.5% 0.164 252)
- #C07D00
#C07D00
oklch(64.4% 0.138 72)
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 #3390ED, 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 0.022
- Dodger Blue #1E90FF ΔE 0.028
- Soft Blue #6488EA ΔE 0.043
- Cornflower Blue #6495ED ΔE 0.045
- Water Blue #0E87CC ΔE 0.057
- Clear Blue #247AFD ΔE 0.066
- Cornflower #6A79F7 ΔE 0.074
Use #3390ED 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.