#399EEE
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.8% 0.15 246.7), rgb(57, 158, 238).
Aa
Black text reads best on this color (7.29:1).
About this color
#399EEE is a medium-light, vivid blue. In OKLCH its lightness is 68%, its chroma 0.150 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.025 away. Black text reads best on it, at 7.29:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.29:1 |
| White text | 2.87:1 |
Values
| HEX | #399EEE |
| RGB | rgb(57, 158, 238) |
| HSL | hsl(207, 84%, 58%) |
| OKLCH | oklch(67.8% 0.15 246.7) |
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 #399EEE | 2.87:1 | Fails | Lc -59.9 | Large or bold text, headings |
| Black text on #399EEE | 7.29:1 | AAA | Lc 49.4 | Large or bold text, headings |
| #399EEE text on white | 2.87:1 | Fails | Lc 54.6 | Large or bold text, headings |
| #399EEE text on black | 7.29:1 | AAA | Lc -47.2 | 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)
#399EEE
oklch(67.8% 0.15 246.7)
-
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
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#004472
oklch(37.6% 0.099 246.8)
-
Step 950
950
#002846
oklch(26.9% 0.07 246.6)
#399EEE 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) | #79A1F1 | 0.058 |
| Deuteranopia (no green cones) | #5F91EC | 0.041 |
| Tritanopia (no blue cones) | #00B1BB | 0.107 |
| Achromatopsia (no color) | #989898 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399EEE
#399EEE
oklch(67.8% 0.15 246.7)
- #D48202
#D48202
oklch(67.8% 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 #399EEE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.025
- Cornflower Blue #6495ED ΔE 0.038
- Dark Sky Blue #448EE4 ΔE 0.042
- Dodger Blue #1E90FF ΔE 0.052
- Soft Blue #6488EA ΔE 0.062
- Water Blue #0E87CC ΔE 0.081
- Faded Blue #658CBB ΔE 0.083
- Deep Sky Blue #00BFFF ΔE 0.087
Use #399EEE 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.