#399FF9
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.7% 0.162 249.3), rgb(57, 159, 249).
Aa
Black text reads best on this color (7.50:1).
About this color
#399FF9 is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.162 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.028 away. Black text reads best on it, at 7.50:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.50:1 |
| White text | 2.79:1 |
Values
| HEX | #399FF9 |
| RGB | rgb(57, 159, 249) |
| HSL | hsl(208, 94%, 60%) |
| OKLCH | oklch(68.7% 0.162 249.3) |
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 #399FF9 | 2.79:1 | Fails | Lc -58.7 | Large or bold text, headings |
| Black text on #399FF9 | 7.50:1 | AAA | Lc 50.6 | Large or bold text, headings |
| #399FF9 text on white | 2.79:1 | Fails | Lc 53.5 | Large or bold text, headings |
| #399FF9 text on black | 7.50:1 | AAA | Lc -48.4 | 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
#EFF6FE
oklch(97% 0.013 251.6)
-
Step 100
100
#DCECFD
oklch(93.6% 0.029 249.8)
-
Step 200
200
#BDDDFD
oklch(88.5% 0.056 248.5)
-
Step 300
300
#8DC6FF
oklch(80.9% 0.1 249.2)
-
Step 400
400 (this color)
#399FF9
oklch(68.7% 0.162 249.3)
-
Step 500
500
#008DED
oklch(63.1% 0.175 249.1)
-
Step 600
600
#0076C9
oklch(55.6% 0.155 249.4)
-
Step 700
700
#0063AA
oklch(49.1% 0.137 249.4)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#004376
oklch(37.6% 0.105 249.5)
-
Step 950
950
#002849
oklch(27.1% 0.074 248.8)
#399FF9 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) | #75A4FD | 0.055 |
| Deuteranopia (no green cones) | #5892F7 | 0.037 |
| Tritanopia (no blue cones) | #00B5C0 | 0.119 |
| Achromatopsia (no color) | #9A9A9A | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399FF9
#399FF9
oklch(68.7% 0.162 249.3)
- #D48600
#D48600
oklch(68.5% 0.149 69.2)
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 #399FF9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.028
- Cornflower Blue #6495ED ΔE 0.040
- Dodger Blue #1E90FF ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.050
- Soft Blue #6488EA ΔE 0.064
- Periwinkle Blue #8F99FB ΔE 0.083
- Deep Sky Blue #00BFFF ΔE 0.084
- Perrywinkle #8F8CE7 ΔE 0.092
Use #399FF9 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.