#399FCF
Closest named color: Faded Blue (#658CBB). oklch(66.5% 0.116 233), rgb(57, 159, 207).
Aa
Black text reads best on this color (7.03:1).
About this color
#399FCF is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.116 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.059 away. Black text reads best on it, at 7.03:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 7.03:1 |
| White text | 2.98:1 |
Values
| HEX | #399FCF |
| RGB | rgb(57, 159, 207) |
| HSL | hsl(199, 61%, 52%) |
| OKLCH | oklch(66.5% 0.116 233) |
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 #399FCF | 2.98:1 | Fails | Lc -61.5 | Content text, not long reading |
| Black text on #399FCF | 7.03:1 | AAA | Lc 47.9 | Large or bold text, headings |
| #399FCF text on white | 2.98:1 | Fails | Lc 56.1 | Large or bold text, headings |
| #399FCF text on black | 7.03:1 | AAA | Lc -45.6 | 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 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
#9DC8E0
oklch(81% 0.057 232.8)
-
Step 400
400
#63AAD0
oklch(70.6% 0.091 233.5)
-
Step 500
500 (this color)
#399FCF
oklch(66.5% 0.116 233)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#044863
oklch(37.8% 0.076 232.5)
-
Step 950
950
#082A3A
oklch(27% 0.048 233.3)
#399FCF 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) | #879DD1 | 0.074 |
| Deuteranopia (no green cones) | #738FCE | 0.063 |
| Tritanopia (no blue cones) | #00ACAF | 0.072 |
| Achromatopsia (no color) | #959595 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399FCF
#399FCF
oklch(66.5% 0.116 233)
- #CB7E4B
#CB7E4B
oklch(66.5% 0.117 52.9)
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 #399FCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.059
- Turquoise Blue #06B1C4 ΔE 0.059
- Chefchaouen Blue #4895EF ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.063
- Greyblue #77A1B5 ΔE 0.066
- Cornflower Blue #6495ED ΔE 0.068
- Cadet Blue #5F9EA0 ΔE 0.073
- Blue NCS #118AB2 ΔE 0.073
Use #399FCF 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.