#399BF6
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.6% 0.162 250.3), rgb(57, 155, 246).
Aa
Black text reads best on this color (7.19:1).
About this color
#399BF6 is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.162 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.018 away. Black text reads best on it, at 7.19:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.19:1 |
| White text | 2.91:1 |
Values
| HEX | #399BF6 |
| RGB | rgb(57, 155, 246) |
| HSL | hsl(209, 91%, 59%) |
| OKLCH | oklch(67.6% 0.162 250.3) |
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 #399BF6 | 2.91:1 | Fails | Lc -60.5 | Content text, not long reading |
| Black text on #399BF6 | 7.19:1 | AAA | Lc 48.9 | Large or bold text, headings |
| #399BF6 text on white | 2.91:1 | Fails | Lc 55.2 | Large or bold text, headings |
| #399BF6 text on black | 7.19:1 | AAA | Lc -46.6 | 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
#DCECFD
oklch(93.6% 0.029 249.8)
-
Step 200
200
#BEDDFE
oklch(88.6% 0.056 250.1)
-
Step 300
300
#8FC6FF
oklch(81% 0.099 250)
-
Step 400
400 (this color)
#399BF6
oklch(67.6% 0.162 250.3)
-
Step 500
500
#008CF1
oklch(63.1% 0.18 250.4)
-
Step 600
600
#0075CB
oklch(55.5% 0.159 250.4)
-
Step 700
700
#0062AC
oklch(49% 0.141 250.5)
-
Step 800
800
#00508E
oklch(42.6% 0.122 250.5)
-
Step 900
900
#004378
oklch(37.8% 0.108 250.3)
-
Step 950
950
#00274A
oklch(26.9% 0.077 250.5)
#399BF6 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) | #70A0FA | 0.051 |
| Deuteranopia (no green cones) | #538FF4 | 0.033 |
| Tritanopia (no blue cones) | #00B1BD | 0.120 |
| Achromatopsia (no color) | #979797 | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399BF6
#399BF6
oklch(67.6% 0.162 250.3)
- #CF8400
#CF8400
oklch(67.5% 0.146 70)
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 #399BF6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.018
- Cornflower Blue #6495ED ΔE 0.036
- Dodger Blue #1E90FF ΔE 0.038
- Dark Sky Blue #448EE4 ΔE 0.039
- Soft Blue #6488EA ΔE 0.055
- Water Blue #0E87CC ΔE 0.083
- Periwinkle Blue #8F99FB ΔE 0.085
- Perrywinkle #8F8CE7 ΔE 0.090
Use #399BF6 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.