#399FEF
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.1% 0.15 246.5), rgb(57, 159, 239).
Aa
Black text reads best on this color (7.37:1).
About this color
#399FEF is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.150 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.027 away. Black text reads best on it, at 7.37:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.37:1 |
| White text | 2.84:1 |
Values
| HEX | #399FEF |
| RGB | rgb(57, 159, 239) |
| HSL | hsl(206, 85%, 58%) |
| OKLCH | oklch(68.1% 0.15 246.5) |
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 #399FEF | 2.84:1 | Fails | Lc -59.4 | Large or bold text, headings |
| Black text on #399FEF | 7.37:1 | AAA | Lc 49.9 | Large or bold text, headings |
| #399FEF text on white | 2.84:1 | Fails | Lc 54.1 | Large or bold text, headings |
| #399FEF text on black | 7.37:1 | AAA | Lc -47.7 | 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
#DCECFB
oklch(93.6% 0.027 246.3)
-
Step 200
200
#BEDDFA
oklch(88.4% 0.052 246.6)
-
Step 300
300
#8EC7FA
oklch(80.9% 0.094 246.3)
-
Step 400
400 (this color)
#399FEF
oklch(68.1% 0.15 246.5)
-
Step 500
500
#008FE6
oklch(63.1% 0.164 246.6)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#005287
oklch(42.6% 0.111 246.5)
-
Step 900
900
#004472
oklch(37.6% 0.099 246.8)
-
Step 950
950
#002846
oklch(26.9% 0.07 246.6)
#399FEF 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) | #7AA2F2 | 0.059 |
| Deuteranopia (no green cones) | #6092ED | 0.042 |
| Tritanopia (no blue cones) | #00B2BC | 0.107 |
| Achromatopsia (no color) | #999999 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399FEF
#399FEF
oklch(68.1% 0.15 246.5)
- #D58305
#D58305
oklch(68.1% 0.15 66.7)
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 #399FEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.027
- Cornflower Blue #6495ED ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.045
- Dodger Blue #1E90FF ΔE 0.053
- Soft Blue #6488EA ΔE 0.064
- Water Blue #0E87CC ΔE 0.084
- Deep Sky Blue #00BFFF ΔE 0.084
- Faded Blue #658CBB ΔE 0.085
Use #399FEF 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.