#399CFE
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.3% 0.171 251.7), rgb(57, 156, 254).
Aa
Black text reads best on this color (7.36:1).
About this color
#399CFE is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.171 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.026 away. Black text reads best on it, at 7.36:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.36:1 |
| White text | 2.85:1 |
Values
| HEX | #399CFE |
| RGB | rgb(57, 156, 254) |
| HSL | hsl(210, 99%, 61%) |
| OKLCH | oklch(68.3% 0.171 251.7) |
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 #399CFE | 2.85:1 | Fails | Lc -59.5 | Large or bold text, headings |
| Black text on #399CFE | 7.36:1 | AAA | Lc 49.8 | Large or bold text, headings |
| #399CFE text on white | 2.85:1 | Fails | Lc 54.2 | Large or bold text, headings |
| #399CFE text on black | 7.36:1 | AAA | Lc -47.6 | 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
#BEDCFF
oklch(88.4% 0.058 252.4)
-
Step 300
300
#91C5FF
oklch(80.9% 0.099 251.8)
-
Step 400
400 (this color)
#399CFE
oklch(68.3% 0.171 251.7)
-
Step 500
500
#008BF5
oklch(63.2% 0.186 251.5)
-
Step 600
600
#0074CF
oklch(55.5% 0.165 251.7)
-
Step 700
700
#0061AF
oklch(49% 0.146 251.8)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900
#00427A
oklch(37.7% 0.112 251.7)
-
Step 950
950
#00274C
oklch(27.1% 0.08 251.6)
#399CFE 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) | #6DA3FF | 0.049 |
| Deuteranopia (no green cones) | #4E91FC | 0.029 |
| Tritanopia (no blue cones) | #00B3C1 | 0.126 |
| Achromatopsia (no color) | #999999 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399CFE
#399CFE
oklch(68.3% 0.171 251.7)
- #D08700
#D08700
oklch(68.2% 0.146 71.5)
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 #399CFE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.026
- Dodger Blue #1E90FF ΔE 0.037
- Cornflower Blue #6495ED ΔE 0.040
- Dark Sky Blue #448EE4 ΔE 0.048
- Soft Blue #6488EA ΔE 0.059
- Periwinkle Blue #8F99FB ΔE 0.083
- Lavender Blue #8B88F8 ΔE 0.089
- Cornflower #6A79F7 ΔE 0.091
Use #399CFE 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.