#3399FF
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.6% 0.176 252.3), rgb(51, 153, 255).
Aa
Black text reads best on this color (7.14:1).
About this color
#3399FF is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.176 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.026 away. Black text reads best on it, at 7.14:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.176) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.14:1 |
| White text | 2.94:1 |
Values
| HEX | #3399FF |
| RGB | rgb(51, 153, 255) |
| HSL | hsl(210, 100%, 60%) |
| OKLCH | oklch(67.6% 0.176 252.3) |
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 #3399FF | 2.94:1 | Fails | Lc -60.7 | Content text, not long reading |
| Black text on #3399FF | 7.14:1 | AAA | Lc 48.7 | Large or bold text, headings |
| #3399FF text on white | 2.94:1 | Fails | Lc 55.4 | Large or bold text, headings |
| #3399FF text on black | 7.14:1 | AAA | Lc -46.4 | Large or bold text, headings |
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 400.
-
Step 50
50
#EFF6FF
oklch(97% 0.014 254.6)
-
Step 100
100
#DBECFF
oklch(93.6% 0.032 251.1)
-
Step 200
200
#BEDCFF
oklch(88.4% 0.058 252.4)
-
Step 300
300
#92C5FF
oklch(80.9% 0.099 252.2)
-
Step 400
400 (this color)
#3399FF
oklch(67.6% 0.176 252.3)
-
Step 500
500
#008AF7
oklch(63.1% 0.19 252.2)
-
Step 600
600
#0074D1
oklch(55.7% 0.167 252.1)
-
Step 700
700
#0061B1
oklch(49.1% 0.148 252.3)
-
Step 800
800
#004F92
oklch(42.6% 0.129 252.3)
-
Step 900
900
#00427B
oklch(37.7% 0.113 252.1)
-
Step 950
950
#00274C
oklch(27.1% 0.08 251.6)
#3399FF 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) | #67A0FF | 0.047 |
| Deuteranopia (no green cones) | #448EFD | 0.028 |
| Tritanopia (no blue cones) | #00B1C0 | 0.130 |
| Achromatopsia (no color) | #969696 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3399FF
#3399FF
oklch(67.6% 0.176 252.3)
- #CC8600
#CC8600
oklch(67.5% 0.144 72.6)
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 #3399FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.026
- Dodger Blue #1E90FF ΔE 0.027
- Cornflower Blue #6495ED ΔE 0.043
- Dark Sky Blue #448EE4 ΔE 0.045
- Soft Blue #6488EA ΔE 0.057
- Clear Blue #247AFD ΔE 0.082
- Cornflower #6A79F7 ΔE 0.085
- Periwinkle Blue #8F99FB ΔE 0.088
Use #3399FF 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.