#399EDF
Closest named color: Chefchaouen Blue (#4895EF). oklch(67% 0.133 241.4), rgb(57, 158, 223).
Aa
Black text reads best on this color (7.13:1).
About this color
#399EDF is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.133 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.039 away. Black text reads best on it, at 7.13:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.13:1 |
| White text | 2.94:1 |
Values
| HEX | #399EDF |
| RGB | rgb(57, 158, 223) |
| HSL | hsl(203, 72%, 55%) |
| OKLCH | oklch(67% 0.133 241.4) |
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 #399EDF | 2.94:1 | Fails | Lc -60.9 | Content text, not long reading |
| Black text on #399EDF | 7.13:1 | AAA | Lc 48.5 | Large or bold text, headings |
| #399EDF text on white | 2.94:1 | Fails | Lc 55.6 | Large or bold text, headings |
| #399EDF text on black | 7.13:1 | AAA | Lc -46.2 | 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
#EFF7FC
oklch(97.2% 0.011 234.8)
-
Step 100
100
#DCECF9
oklch(93.5% 0.025 242.3)
-
Step 200
200
#BFDEF5
oklch(88.5% 0.046 240.2)
-
Step 300
300
#90C8F2
oklch(80.9% 0.083 241.4)
-
Step 400
400 (this color)
#399EDF
oklch(67% 0.133 241.4)
-
Step 500
500
#0092DA
oklch(63.1% 0.148 241.4)
-
Step 600
600
#007BB8
oklch(55.7% 0.13 241.1)
-
Step 700
700
#00679B
oklch(49.1% 0.115 241)
-
Step 800
800
#005480
oklch(42.6% 0.1 241.3)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#002942
oklch(26.9% 0.063 241.6)
#399EDF 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) | #809FE2 | 0.066 |
| Deuteranopia (no green cones) | #698FDE | 0.053 |
| Tritanopia (no blue cones) | #00AEB5 | 0.090 |
| Achromatopsia (no color) | #969696 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399EDF
#399EDF
oklch(67% 0.133 241.4)
- #CF8032
#CF8032
oklch(67% 0.133 61.2)
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 #399EDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.046
- Cornflower Blue #6495ED ΔE 0.048
- Faded Blue #658CBB ΔE 0.067
- Dodger Blue #1E90FF ΔE 0.068
- Soft Blue #6488EA ΔE 0.070
- Water Blue #0E87CC ΔE 0.072
- Turquoise Blue #06B1C4 ΔE 0.077
Use #399EDF 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.