#399EE7
Closest named color: Chefchaouen Blue (#4895EF). oklch(67.4% 0.142 244.4), rgb(57, 158, 231).
Aa
Black text reads best on this color (7.21:1).
About this color
#399EE7 is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.142 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Chefchaouen Blue (#4895EF), ΔE 0.030 away. Black text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Chefchaouen Blue (#4895EF) |
| Black text | 7.21:1 |
| White text | 2.90:1 |
Values
| HEX | #399EE7 |
| RGB | rgb(57, 158, 231) |
| HSL | hsl(205, 78%, 56%) |
| OKLCH | oklch(67.4% 0.142 244.4) |
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 #399EE7 | 2.90:1 | Fails | Lc -60.4 | Content text, not long reading |
| Black text on #399EE7 | 7.21:1 | AAA | Lc 49.0 | Large or bold text, headings |
| #399EE7 text on white | 2.90:1 | Fails | Lc 55.1 | Large or bold text, headings |
| #399EE7 text on black | 7.21:1 | AAA | Lc -46.7 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DCECFA
oklch(93.5% 0.026 244.4)
-
Step 200
200
#BFDDF8
oklch(88.4% 0.049 245.6)
-
Step 300
300
#8FC7F6
oklch(80.8% 0.089 244.5)
-
Step 400
400 (this color)
#399EE7
oklch(67.4% 0.142 244.4)
-
Step 500
500
#0090E0
oklch(63% 0.157 244.4)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0066A0
oklch(49.2% 0.121 244)
-
Step 800
800
#005384
oklch(42.6% 0.106 244.3)
-
Step 900
900
#00456F
oklch(37.6% 0.093 244.3)
-
Step 950
950
#002945
oklch(27.1% 0.068 244.5)
#399EE7 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) | #7CA0EA | 0.061 |
| Deuteranopia (no green cones) | #6490E6 | 0.047 |
| Tritanopia (no blue cones) | #00B0B8 | 0.100 |
| Achromatopsia (no color) | #979797 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399EE7
#399EE7
oklch(67.4% 0.142 244.4)
- #D28121
#D28121
oklch(67.5% 0.142 64.1)
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 #399EE7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Chefchaouen Blue #4895EF ΔE 0.030
- Cornflower Blue #6495ED ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.042
- Dodger Blue #1E90FF ΔE 0.059
- Soft Blue #6488EA ΔE 0.065
- Faded Blue #658CBB ΔE 0.075
- Water Blue #0E87CC ΔE 0.076
- Turquoise Blue #06B1C4 ΔE 0.086
Use #399EE7 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.