#399BEC
Closest named color: Chefchaouen Blue (#4895EF). oklch(67% 0.15 247.6), rgb(57, 155, 236).
Aa
Black text reads best on this color (7.07:1).
About this color
#399BEC is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.150 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.019 away. Black text reads best on it, at 7.07:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.07:1 |
| White text | 2.96:1 |
Values
| HEX | #399BEC |
| RGB | rgb(57, 155, 236) |
| HSL | hsl(207, 82%, 57%) |
| OKLCH | oklch(67% 0.15 247.6) |
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 #399BEC | 2.96:1 | Fails | Lc -61.2 | Content text, not long reading |
| Black text on #399BEC | 7.07:1 | AAA | Lc 48.2 | Large or bold text, headings |
| #399BEC text on white | 2.96:1 | Fails | Lc 55.9 | Large or bold text, headings |
| #399BEC text on black | 7.07:1 | AAA | Lc -45.9 | 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
#DCECFC
oklch(93.6% 0.028 248.1)
-
Step 200
200
#BFDDFB
oklch(88.5% 0.052 248.4)
-
Step 300
300
#8FC6FB
oklch(80.8% 0.095 248.2)
-
Step 400
400 (this color)
#399BEC
oklch(67% 0.15 247.6)
-
Step 500
500
#008EE9
oklch(63.1% 0.169 247.8)
-
Step 600
600
#0077C4
oklch(55.5% 0.148 247.6)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#005289
oklch(42.7% 0.113 247.3)
-
Step 900
900
#004474
oklch(37.7% 0.101 247.8)
-
Step 950
950
#002847
oklch(27% 0.072 247.4)
#399BEC 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) | #759FEF | 0.055 |
| Deuteranopia (no green cones) | #5C8EEA | 0.040 |
| Tritanopia (no blue cones) | #00AEB8 | 0.108 |
| Achromatopsia (no color) | #969696 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399BEC
#399BEC
oklch(67% 0.15 247.6)
- #D08100
#D08100
oklch(67.1% 0.148 67.7)
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 #399BEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.019
- Dark Sky Blue #448EE4 ΔE 0.034
- Cornflower Blue #6495ED ΔE 0.036
- Dodger Blue #1E90FF ΔE 0.047
- Soft Blue #6488EA ΔE 0.056
- Water Blue #0E87CC ΔE 0.074
- Faded Blue #658CBB ΔE 0.079
- Cool Blue #4984B8 ΔE 0.089
Use #399BEC 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.