#399AEC
Closest named color: Chefchaouen Blue (#4895EF). oklch(66.8% 0.151 248.1), rgb(57, 154, 236).
Aa
Black text reads best on this color (7.00:1).
About this color
#399AEC is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.151 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.017 away. Black text reads best on it, at 7.00:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.00:1 |
| White text | 2.99:1 |
Values
| HEX | #399AEC |
| RGB | rgb(57, 154, 236) |
| HSL | hsl(207, 82%, 57%) |
| OKLCH | oklch(66.8% 0.151 248.1) |
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 #399AEC | 2.99:1 | Fails | Lc -61.6 | Content text, not long reading |
| Black text on #399AEC | 7.00:1 | AAA | Lc 47.8 | Large or bold text, headings |
| #399AEC text on white | 2.99:1 | Fails | Lc 56.2 | Large or bold text, headings |
| #399AEC text on black | 7.00:1 | AAA | Lc -45.5 | 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 500.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C5DCF4
oklch(88.5% 0.041 249.4)
-
Step 300
300
#9BC5EF
oklch(80.8% 0.075 248.8)
-
Step 400
400
#61A6E7
oklch(70.7% 0.119 248.5)
-
Step 500
500 (this color)
#399AEC
oklch(66.8% 0.151 248.1)
-
Step 600
600
#0077C6
oklch(55.6% 0.15 248.2)
-
Step 700
700
#0064A7
oklch(49.1% 0.132 247.9)
-
Step 800
800
#00528A
oklch(42.8% 0.115 247.8)
-
Step 900
900
#054473
oklch(37.8% 0.099 248.2)
-
Step 950
950
#082843
oklch(27% 0.062 248.2)
#399AEC 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) | #749EEF | 0.055 |
| Deuteranopia (no green cones) | #5A8EEA | 0.037 |
| Tritanopia (no blue cones) | #00AEB8 | 0.110 |
| Achromatopsia (no color) | #959595 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399AEC
#399AEC
oklch(66.8% 0.151 248.1)
- #CE8000
#CE8000
oklch(66.7% 0.146 67.9)
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 #399AEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.017
- Dark Sky Blue #448EE4 ΔE 0.032
- Cornflower Blue #6495ED ΔE 0.036
- Dodger Blue #1E90FF ΔE 0.045
- Soft Blue #6488EA ΔE 0.054
- Water Blue #0E87CC ΔE 0.072
- Faded Blue #658CBB ΔE 0.078
- Cool Blue #4984B8 ΔE 0.088
Use #399AEC 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.