#399DCC
Closest named color: Faded Blue (#658CBB). oklch(65.9% 0.114 232.9), rgb(57, 157, 204).
Aa
Black text reads best on this color (6.86:1).
About this color
#399DCC is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.114 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.055 away. Black text reads best on it, at 6.86:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.86:1 |
| White text | 3.05:1 |
Values
| HEX | #399DCC |
| RGB | rgb(57, 157, 204) |
| HSL | hsl(199, 59%, 51%) |
| OKLCH | oklch(65.9% 0.114 232.9) |
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 #399DCC | 3.05:1 | AA large text | Lc -62.5 | Content text, not long reading |
| Black text on #399DCC | 6.86:1 | AA | Lc 47.0 | Large or bold text, headings |
| #399DCC text on white | 3.05:1 | AA large text | Lc 57.1 | Large or bold text, headings |
| #399DCC text on black | 6.86:1 | AA | Lc -44.7 | 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
#C6DDEB
oklch(88.5% 0.031 234.5)
-
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)
#399DCC
oklch(65.9% 0.114 232.9)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006990
oklch(49% 0.101 232.9)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#074862
oklch(37.8% 0.074 232)
-
Step 950
950
#092A3A
oklch(27% 0.048 233.8)
#399DCC 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) | #869BCE | 0.074 |
| Deuteranopia (no green cones) | #728DCB | 0.063 |
| Tritanopia (no blue cones) | #00AAAD | 0.071 |
| Achromatopsia (no color) | #939393 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399DCC
#399DCC
oklch(65.9% 0.114 232.9)
- #C87D4B
#C87D4B
oklch(65.9% 0.114 53.1)
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 #399DCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.055
- Dark Sky Blue #448EE4 ΔE 0.062
- Turquoise Blue #06B1C4 ΔE 0.062
- Chefchaouen Blue #4895EF ΔE 0.063
- Greyblue #77A1B5 ΔE 0.066
- Blue NCS #118AB2 ΔE 0.067
- Water Blue #0E87CC ΔE 0.069
- Cool Blue #4984B8 ΔE 0.069
Use #399DCC 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.