#399CFA
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.1% 0.166 250.8), rgb(57, 156, 250).
Aa
Black text reads best on this color (7.30:1).
About this color
#399CFA is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.166 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.022 away. Black text reads best on it, at 7.30:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.30:1 |
| White text | 2.87:1 |
Values
| HEX | #399CFA |
| RGB | rgb(57, 156, 250) |
| HSL | hsl(209, 95%, 60%) |
| OKLCH | oklch(68.1% 0.166 250.8) |
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 #399CFA | 2.87:1 | Fails | Lc -59.8 | Large or bold text, headings |
| Black text on #399CFA | 7.30:1 | AAA | Lc 49.5 | Large or bold text, headings |
| #399CFA text on white | 2.87:1 | Fails | Lc 54.5 | Large or bold text, headings |
| #399CFA text on black | 7.30:1 | AAA | Lc -47.3 | 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
#DCECFE
oklch(93.7% 0.03 251.3)
-
Step 200
200
#BEDDFF
oklch(88.6% 0.058 250.9)
-
Step 300
300
#90C5FF
oklch(80.8% 0.1 251.3)
-
Step 400
400 (this color)
#399CFA
oklch(68.1% 0.166 250.8)
-
Step 500
500
#008BF2
oklch(63% 0.183 250.9)
-
Step 600
600
#0075CD
oklch(55.6% 0.161 250.9)
-
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
#004379
oklch(37.8% 0.109 250.7)
-
Step 950
950
#00274B
oklch(27% 0.079 251.1)
#399CFA 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) | #6FA2FE | 0.050 |
| Deuteranopia (no green cones) | #5190F8 | 0.033 |
| Tritanopia (no blue cones) | #00B2BF | 0.122 |
| Achromatopsia (no color) | #989898 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399CFA
#399CFA
oklch(68.1% 0.166 250.8)
- #D08600
#D08600
oklch(68% 0.147 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 #399CFA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.022
- Cornflower Blue #6495ED ΔE 0.038
- Dodger Blue #1E90FF ΔE 0.038
- Dark Sky Blue #448EE4 ΔE 0.044
- Soft Blue #6488EA ΔE 0.058
- Periwinkle Blue #8F99FB ΔE 0.083
- Water Blue #0E87CC ΔE 0.088
- Lavender Blue #8B88F8 ΔE 0.089
Use #399CFA 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.