#399DF9
Closest named color: Chefchaouen Blue (#4895EF). oklch(68.2% 0.164 250.1), rgb(57, 157, 249).
Aa
Black text reads best on this color (7.36:1).
About this color
#399DF9 is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.164 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.023 away. Black text reads best on it, at 7.36:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.36:1 |
| White text | 2.85:1 |
Values
| HEX | #399DF9 |
| RGB | rgb(57, 157, 249) |
| HSL | hsl(209, 94%, 60%) |
| OKLCH | oklch(68.2% 0.164 250.1) |
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 #399DF9 | 2.85:1 | Fails | Lc -59.5 | Large or bold text, headings |
| Black text on #399DF9 | 7.36:1 | AAA | Lc 49.8 | Large or bold text, headings |
| #399DF9 text on white | 2.85:1 | Fails | Lc 54.2 | Large or bold text, headings |
| #399DF9 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
#DCECFD
oklch(93.6% 0.029 249.8)
-
Step 200
200
#BEDDFE
oklch(88.6% 0.056 250.1)
-
Step 300
300
#8FC6FF
oklch(81% 0.099 250)
-
Step 400
400 (this color)
#399DF9
oklch(68.2% 0.164 250.1)
-
Step 500
500
#008CF0
oklch(63.1% 0.179 250.1)
-
Step 600
600
#0076CB
oklch(55.7% 0.158 250)
-
Step 700
700
#0063AC
oklch(49.2% 0.139 250)
-
Step 800
800
#00518E
oklch(42.8% 0.121 249.9)
-
Step 900
900
#004377
oklch(37.7% 0.106 249.9)
-
Step 950
950
#00274A
oklch(26.9% 0.077 250.5)
#399DF9 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) | #72A3FD | 0.053 |
| Deuteranopia (no green cones) | #5491F7 | 0.034 |
| Tritanopia (no blue cones) | #00B3BF | 0.121 |
| Achromatopsia (no color) | #999999 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399DF9
#399DF9
oklch(68.2% 0.164 250.1)
- #D28600
#D28600
oklch(68.3% 0.148 70)
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 #399DF9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.023
- Cornflower Blue #6495ED ΔE 0.038
- Dodger Blue #1E90FF ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.045
- Soft Blue #6488EA ΔE 0.060
- Periwinkle Blue #8F99FB ΔE 0.083
- Water Blue #0E87CC ΔE 0.089
- Deep Sky Blue #00BFFF ΔE 0.090
Use #399DF9 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.