#399DE9
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.3% 0.145 245.6), rgb(57, 157, 233).
Aa
Black text reads best on this color (7.17:1).
About this color
#399DE9 is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.145 and its hue 246°. 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 7.17:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.17:1 |
| White text | 2.92:1 |
Values
| HEX | #399DE9 |
| RGB | rgb(57, 157, 233) |
| HSL | hsl(206, 80%, 57%) |
| OKLCH | oklch(67.3% 0.145 245.6) |
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 #399DE9 | 2.92:1 | Fails | Lc -60.6 | Content text, not long reading |
| Black text on #399DE9 | 7.17:1 | AAA | Lc 48.7 | Large or bold text, headings |
| #399DE9 text on white | 2.92:1 | Fails | Lc 55.3 | Large or bold text, headings |
| #399DE9 text on black | 7.17:1 | AAA | Lc -46.5 | 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
#EFF6FD
oklch(97% 0.012 248)
-
Step 100
100
#DCECFB
oklch(93.6% 0.027 246.3)
-
Step 200
200
#BFDDF9
oklch(88.5% 0.05 246.6)
-
Step 300
300
#8FC7F8
oklch(80.9% 0.091 245.6)
-
Step 400
400 (this color)
#399DE9
oklch(67.3% 0.145 245.6)
-
Step 500
500
#0090E3
oklch(63.2% 0.16 245.3)
-
Step 600
600
#0078C0
oklch(55.5% 0.142 245.8)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#002846
oklch(26.9% 0.07 246.6)
#399DE9 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) | #7AA0EC | 0.060 |
| Deuteranopia (no green cones) | #6190E8 | 0.043 |
| Tritanopia (no blue cones) | #00AFB8 | 0.103 |
| Achromatopsia (no color) | #979797 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399DE9
#399DE9
oklch(67.3% 0.145 245.6)
- #D18116
#D18116
oklch(67.3% 0.144 65.8)
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 #399DE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.026
- Cornflower Blue #6495ED ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.039
- Dodger Blue #1E90FF ΔE 0.055
- Soft Blue #6488EA ΔE 0.062
- Water Blue #0E87CC ΔE 0.075
- Faded Blue #658CBB ΔE 0.076
- Cool Blue #4984B8 ΔE 0.089
Use #399DE9 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.