#399EFD
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.7% 0.167 250.7), rgb(57, 158, 253).
Aa
Black text reads best on this color (7.48:1).
About this color
#399EFD is a medium-light, vivid blue. In OKLCH its lightness is 69%, its chroma 0.167 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.028 away. Black text reads best on it, at 7.48:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.48:1 |
| White text | 2.80:1 |
Values
| HEX | #399EFD |
| RGB | rgb(57, 158, 253) |
| HSL | hsl(209, 98%, 61%) |
| OKLCH | oklch(68.7% 0.167 250.7) |
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 #399EFD | 2.80:1 | Fails | Lc -58.8 | Large or bold text, headings |
| Black text on #399EFD | 7.48:1 | AAA | Lc 50.5 | Large or bold text, headings |
| #399EFD text on white | 2.80:1 | Fails | Lc 53.5 | Large or bold text, headings |
| #399EFD text on black | 7.48:1 | AAA | Lc -48.3 | 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
#DBECFE
oklch(93.6% 0.03 249.7)
-
Step 200
200
#BDDDFF
oklch(88.5% 0.058 250.1)
-
Step 300
300
#90C6FF
oklch(81% 0.099 250.4)
-
Step 400
400 (this color)
#399EFD
oklch(68.7% 0.167 250.7)
-
Step 500
500
#008CF2
oklch(63.2% 0.182 250.6)
-
Step 600
600
#0075CC
oklch(55.6% 0.16 250.6)
-
Step 700
700
#0062AD
oklch(49.1% 0.142 250.8)
-
Step 800
800
#00508F
oklch(42.6% 0.123 250.8)
-
Step 900
900
#004378
oklch(37.8% 0.108 250.3)
-
Step 950
950
#00274A
oklch(26.9% 0.077 250.5)
#399EFD 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) | #71A4FF | 0.051 |
| Deuteranopia (no green cones) | #5292FB | 0.033 |
| Tritanopia (no blue cones) | #00B5C1 | 0.125 |
| Achromatopsia (no color) | #9A9A9A | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399EFD
#399EFD
oklch(68.7% 0.167 250.7)
- #D38800
#D38800
oklch(68.8% 0.148 70.8)
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 #399EFD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.028
- Cornflower Blue #6495ED ΔE 0.041
- Dodger Blue #1E90FF ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.051
- Soft Blue #6488EA ΔE 0.063
- Periwinkle Blue #8F99FB ΔE 0.082
- Deep Sky Blue #00BFFF ΔE 0.088
- Lavender Blue #8B88F8 ΔE 0.091
Use #399EFD 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.