#399DCB
Closest named color: Faded Blue (#658CBB). oklch(65.8% 0.113 232.3), rgb(57, 157, 203).
Aa
Black text reads best on this color (6.85:1).
About this color
#399DCB is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.113 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.054 away. Black text reads best on it, at 6.85:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.85:1 |
| White text | 3.06:1 |
Values
| HEX | #399DCB |
| RGB | rgb(57, 157, 203) |
| HSL | hsl(199, 58%, 51%) |
| OKLCH | oklch(65.8% 0.113 232.3) |
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 #399DCB | 3.06:1 | AA large text | Lc -62.5 | Content text, not long reading |
| Black text on #399DCB | 6.85:1 | AA | Lc 46.9 | Large or bold text, headings |
| #399DCB text on white | 3.06:1 | AA large text | Lc 57.2 | Large or bold text, headings |
| #399DCB text on black | 6.85:1 | AA | Lc -44.6 | 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
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C6DDEA
oklch(88.4% 0.03 232.5)
-
Step 300
300
#9DC8DF
oklch(81% 0.056 231.7)
-
Step 400
400
#64AACF
oklch(70.6% 0.089 233.1)
-
Step 500
500 (this color)
#399DCB
oklch(65.8% 0.113 232.3)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005676
oklch(42.6% 0.087 232.3)
-
Step 900
900
#074862
oklch(37.8% 0.074 232)
-
Step 950
950
#092A39
oklch(26.9% 0.046 232.1)
#399DCB 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) | #869BCD | 0.074 |
| Deuteranopia (no green cones) | #728DCA | 0.063 |
| Tritanopia (no blue cones) | #00A9AC | 0.069 |
| Achromatopsia (no color) | #939393 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399DCB
#399DCB
oklch(65.8% 0.113 232.3)
- #C87D4C
#C87D4C
oklch(65.9% 0.114 52.7)
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 #399DCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.054
- Turquoise Blue #06B1C4 ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.063
- Chefchaouen Blue #4895EF ΔE 0.065
- Greyblue #77A1B5 ΔE 0.065
- Blue NCS #118AB2 ΔE 0.066
- Cool Blue #4984B8 ΔE 0.069
- Dusty Blue #5A86AD ΔE 0.069
Use #399DCB 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.