#399BCE
Closest named color: Faded Blue (#658CBB). oklch(65.5% 0.117 235.5), rgb(57, 155, 206).
Aa
Black text reads best on this color (6.75:1).
About this color
#399BCE is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.117 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.052 away. Black text reads best on it, at 6.75:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.75:1 |
| White text | 3.10:1 |
Values
| HEX | #399BCE |
| RGB | rgb(57, 155, 206) |
| HSL | hsl(201, 60%, 52%) |
| OKLCH | oklch(65.5% 0.117 235.5) |
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 #399BCE | 3.10:1 | AA large text | Lc -63.1 | Content text, not long reading |
| Black text on #399BCE | 6.75:1 | AA | Lc 46.3 | Large or bold text, headings |
| #399BCE text on white | 3.10:1 | AA large text | Lc 57.8 | Large or bold text, headings |
| #399BCE text on black | 6.75:1 | AA | Lc -44.0 | Non-text elements, placeholder text |
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 500.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF4
oklch(93.6% 0.017 236.7)
-
Step 200
200
#C6DDEC
oklch(88.5% 0.032 236.4)
-
Step 300
300
#9DC7E1
oklch(80.8% 0.058 235.6)
-
Step 400
400
#64AAD2
oklch(70.7% 0.092 235.2)
-
Step 500
500 (this color)
#399BCE
oklch(65.5% 0.117 235.5)
-
Step 600
600
#007DAF
oklch(55.7% 0.119 235.4)
-
Step 700
700
#006994
oklch(49.2% 0.105 235.5)
-
Step 800
800
#00567A
oklch(42.8% 0.091 235.4)
-
Step 900
900
#084764
oklch(37.6% 0.076 235.5)
-
Step 950
950
#092A3B
oklch(27.1% 0.049 235.4)
#399BCE 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) | #829AD0 | 0.070 |
| Deuteranopia (no green cones) | #6E8CCD | 0.058 |
| Tritanopia (no blue cones) | #00A8AC | 0.075 |
| Achromatopsia (no color) | #929292 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399BCE
#399BCE
oklch(65.5% 0.117 235.5)
- #C77C44
#C77C44
oklch(65.5% 0.118 55.6)
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 #399BCE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.052
- Dark Sky Blue #448EE4 ΔE 0.055
- Chefchaouen Blue #4895EF ΔE 0.058
- Water Blue #0E87CC ΔE 0.063
- Blue NCS #118AB2 ΔE 0.065
- Cool Blue #4984B8 ΔE 0.065
- Cornflower Blue #6495ED ΔE 0.065
- Dusty Blue #5A86AD ΔE 0.067
Use #399BCE 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.