#399EB7
Closest named color: Cadet Blue (#5F9EA0). oklch(65.2% 0.098 217.5), rgb(57, 158, 183).
Aa
Black text reads best on this color (6.74:1).
About this color
#399EB7 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.098 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.043 away. Black text reads best on it, at 6.74:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.74:1 |
| White text | 3.11:1 |
Values
| HEX | #399EB7 |
| RGB | rgb(57, 158, 183) |
| HSL | hsl(192, 53%, 47%) |
| OKLCH | oklch(65.2% 0.098 217.5) |
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 #399EB7 | 3.11:1 | AA large text | Lc -63.2 | Content text, not long reading |
| Black text on #399EB7 | 6.74:1 | AA | Lc 46.2 | Large or bold text, headings |
| #399EB7 text on white | 3.11:1 | AA large text | Lc 57.8 | Large or bold text, headings |
| #399EB7 text on black | 6.74:1 | AA | Lc -43.9 | 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
#E0ECF0
oklch(93.5% 0.014 219.6)
-
Step 200
200
#C7DEE5
oklch(88.6% 0.026 218)
-
Step 300
300
#9EC9D5
oklch(80.9% 0.048 216.7)
-
Step 400
400
#66ADC0
oklch(70.8% 0.076 216.9)
-
Step 500
500 (this color)
#399EB7
oklch(65.2% 0.098 217.5)
-
Step 600
600
#00819A
oklch(55.7% 0.1 217.7)
-
Step 700
700
#006C81
oklch(49% 0.088 217.4)
-
Step 800
800
#00596A
oklch(42.8% 0.076 216.6)
-
Step 900
900
#094A58
oklch(37.9% 0.064 217)
-
Step 950
950
#0A2B33
oklch(26.9% 0.04 217)
#399EB7 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) | #8E99B8 | 0.085 |
| Deuteranopia (no green cones) | #7C8CB7 | 0.077 |
| Tritanopia (no blue cones) | #00A7A6 | 0.046 |
| Achromatopsia (no color) | #929292 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399EB7
#399EB7
oklch(65.2% 0.098 217.5)
- #C37A64
#C37A64
oklch(65.2% 0.097 37.5)
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 #399EB7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.043
- Turquoise Blue #06B1C4 ΔE 0.052
- Sea #3C9992 ΔE 0.054
- Greyblue #77A1B5 ΔE 0.057
- Teal Green #0A9396 ΔE 0.060
- Faded Blue #658CBB ΔE 0.062
- Persian Green #2A9D8F ΔE 0.063
- Dull Teal #5F9E8F ΔE 0.064
Use #399EB7 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.