#399FC4
Closest named color: Turquoise Blue (#06B1C4). oklch(66% 0.107 226.2), rgb(57, 159, 196).
Aa
Black text reads best on this color (6.93:1).
About this color
#399FC4 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 66%, its chroma 0.107 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.052 away. Black text reads best on it, at 6.93:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 6.93:1 |
| White text | 3.03:1 |
Values
| HEX | #399FC4 |
| RGB | rgb(57, 159, 196) |
| HSL | hsl(196, 55%, 50%) |
| OKLCH | oklch(66% 0.107 226.2) |
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 #399FC4 | 3.03:1 | AA large text | Lc -62.1 | Content text, not long reading |
| Black text on #399FC4 | 6.93:1 | AA | Lc 47.3 | Large or bold text, headings |
| #399FC4 text on white | 3.03:1 | AA large text | Lc 56.8 | Large or bold text, headings |
| #399FC4 text on black | 6.93:1 | AA | Lc -45.0 | 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
#C6DEE8
oklch(88.6% 0.029 224.7)
-
Step 300
300
#9DC8DB
oklch(80.8% 0.053 226.7)
-
Step 400
400
#64ACC9
oklch(70.8% 0.084 226.1)
-
Step 500
500 (this color)
#399FC4
oklch(66% 0.107 226.2)
-
Step 600
600
#007FA3
oklch(55.6% 0.107 226.4)
-
Step 700
700
#006B89
oklch(49.1% 0.094 225.7)
-
Step 800
800
#005771
oklch(42.6% 0.082 226.6)
-
Step 900
900
#06495E
oklch(37.8% 0.07 226)
-
Step 950
950
#092B37
oklch(27.1% 0.044 225.6)
#399FC4 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) | #8B9CC6 | 0.080 |
| Deuteranopia (no green cones) | #788EC4 | 0.070 |
| Tritanopia (no blue cones) | #00AAAB | 0.060 |
| Achromatopsia (no color) | #949494 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399FC4
#399FC4
oklch(66% 0.107 226.2)
- #C87C58
#C87C58
oklch(65.9% 0.107 45.7)
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 #399FC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.052
- Cadet Blue #5F9EA0 ΔE 0.058
- Faded Blue #658CBB ΔE 0.058
- Greyblue #77A1B5 ΔE 0.059
- Blue NCS #118AB2 ΔE 0.068
- Dusty Blue #5A86AD ΔE 0.071
- Silver Lake Blue #778DA9 ΔE 0.071
- Blue Grey #758DA3 ΔE 0.073
Use #399FC4 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.