#399CB2
Closest named color: Cadet Blue (#5F9EA0). oklch(64.5% 0.095 215.4), rgb(57, 156, 178).
Aa
Black text reads best on this color (6.57:1).
About this color
#399CB2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.095 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.040 away. Black text reads best on it, at 6.57:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.57:1 |
| White text | 3.19:1 |
Values
| HEX | #399CB2 |
| RGB | rgb(57, 156, 178) |
| HSL | hsl(191, 51%, 46%) |
| OKLCH | oklch(64.5% 0.095 215.4) |
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 #399CB2 | 3.19:1 | AA large text | Lc -64.3 | Content text, not long reading |
| Black text on #399CB2 | 6.57:1 | AA | Lc 45.2 | Large or bold text, headings |
| #399CB2 text on white | 3.19:1 | AA large text | Lc 58.8 | Large or bold text, headings |
| #399CB2 text on black | 6.57:1 | AA | Lc -42.9 | 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
#F1F7F8
oklch(97.2% 0.007 208.8)
-
Step 100
100
#E0ECEF
oklch(93.5% 0.013 214.4)
-
Step 200
200
#C7DEE4
oklch(88.5% 0.026 215.2)
-
Step 300
300
#9FC9D4
oklch(80.9% 0.047 215.5)
-
Step 400
400
#67ADBE
oklch(70.8% 0.075 215.1)
-
Step 500
500 (this color)
#399CB2
oklch(64.5% 0.095 215.4)
-
Step 600
600
#008197
oklch(55.5% 0.098 215.2)
-
Step 700
700
#006D80
oklch(49.2% 0.087 215.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900
#0B4A56
oklch(37.8% 0.062 214.3)
-
Step 950
950
#0B2B33
oklch(27% 0.039 217.4)
#399CB2 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) | #8D97B3 | 0.085 |
| Deuteranopia (no green cones) | #7B8AB2 | 0.077 |
| Tritanopia (no blue cones) | #00A4A3 | 0.042 |
| Achromatopsia (no color) | #909090 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399CB2
#399CB2
oklch(64.5% 0.095 215.4)
- #C07865
#C07865
oklch(64.5% 0.095 35.5)
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 #399CB2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.040
- Sea #3C9992 ΔE 0.047
- Teal Green #0A9396 ΔE 0.053
- Persian Green #2A9D8F ΔE 0.057
- Turquoise Blue #06B1C4 ΔE 0.058
- Blue NCS #118AB2 ΔE 0.059
- Dull Teal #5F9E8F ΔE 0.060
- Blue Green #0F9B8E ΔE 0.060
Use #399CB2 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.