#399FC8
Closest named color: Turquoise Blue (#06B1C4). oklch(66.1% 0.11 228.8), rgb(57, 159, 200).
Aa
Black text reads best on this color (6.96:1).
About this color
#399FC8 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.110 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.054 away. Black text reads best on it, at 6.96:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 6.96:1 |
| White text | 3.01:1 |
Values
| HEX | #399FC8 |
| RGB | rgb(57, 159, 200) |
| HSL | hsl(197, 57%, 50%) |
| OKLCH | oklch(66.1% 0.11 228.8) |
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 #399FC8 | 3.01:1 | AA large text | Lc -61.9 | Content text, not long reading |
| Black text on #399FC8 | 6.96:1 | AA | Lc 47.5 | Large or bold text, headings |
| #399FC8 text on white | 3.01:1 | AA large text | Lc 56.5 | Large or bold text, headings |
| #399FC8 text on black | 6.96:1 | AA | Lc -45.2 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C6DDE9
oklch(88.4% 0.03 230.3)
-
Step 300
300
#9DC8DD
oklch(80.9% 0.054 229.3)
-
Step 400
400
#63ABCB
oklch(70.6% 0.086 228.6)
-
Step 500
500 (this color)
#399FC8
oklch(66.1% 0.11 228.8)
-
Step 600
600
#007EA6
oklch(55.5% 0.11 229.3)
-
Step 700
700
#006A8C
oklch(49% 0.097 229.1)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#054860
oklch(37.6% 0.072 229.5)
-
Step 950
950
#092A38
oklch(26.9% 0.045 230.2)
#399FC8 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) | #8A9CCA | 0.079 |
| Deuteranopia (no green cones) | #768EC7 | 0.068 |
| Tritanopia (no blue cones) | #00ABAD | 0.064 |
| Achromatopsia (no color) | #959595 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399FC8
#399FC8
oklch(66.1% 0.11 228.8)
- #C97D54
#C97D54
oklch(66.2% 0.11 48.5)
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 #399FC8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.054
- Faded Blue #658CBB ΔE 0.058
- Greyblue #77A1B5 ΔE 0.061
- Cadet Blue #5F9EA0 ΔE 0.063
- Blue NCS #118AB2 ΔE 0.069
- Dark Sky Blue #448EE4 ΔE 0.071
- Dusty Blue #5A86AD ΔE 0.072
- Chefchaouen Blue #4895EF ΔE 0.072
Use #399FC8 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.