#399DA4
Closest named color: Sea (#3C9992). oklch(64.2% 0.091 201.7), rgb(57, 157, 164).
Aa
Black text reads best on this color (6.53:1).
About this color
#399DA4 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.091 and its hue 202°. Its hue sits on the cool side of the wheel. The nearest named color is Sea (#3C9992), ΔE 0.026 away. Black text reads best on it, at 6.53:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Sea (#3C9992) |
| Black text | 6.53:1 |
| White text | 3.21:1 |
Values
| HEX | #399DA4 |
| RGB | rgb(57, 157, 164) |
| HSL | hsl(184, 48%, 43%) |
| OKLCH | oklch(64.2% 0.091 201.7) |
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 #399DA4 | 3.21:1 | AA large text | Lc -64.5 | Content text, not long reading |
| Black text on #399DA4 | 6.53:1 | AA | Lc 45.0 | Non-text elements, placeholder text |
| #399DA4 text on white | 3.21:1 | AA large text | Lc 59.1 | Large or bold text, headings |
| #399DA4 text on black | 6.53:1 | AA | Lc -42.6 | 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
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E1EDED
oklch(93.7% 0.013 196.9)
-
Step 200
200
#C7DEE0
oklch(88.4% 0.025 203.1)
-
Step 300
300
#A0CACD
oklch(81% 0.044 201.7)
-
Step 400
400
#68AEB3
oklch(70.7% 0.071 201.6)
-
Step 500
500 (this color)
#399DA4
oklch(64.2% 0.091 201.7)
-
Step 600
600
#00838B
oklch(55.5% 0.095 202.3)
-
Step 700
700
#006E75
oklch(49% 0.083 202.5)
-
Step 800
800
#005A60
oklch(42.6% 0.073 202.7)
-
Step 900
900
#0C4B4F
oklch(37.8% 0.06 201.5)
-
Step 950
950
#0B2C2E
oklch(27% 0.038 200.8)
#399DA4 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) | #9196A5 | 0.092 |
| Deuteranopia (no green cones) | #818AA4 | 0.085 |
| Tritanopia (no blue cones) | #00A39F | 0.027 |
| Achromatopsia (no color) | #8F8F8F | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399DA4
#399DA4
oklch(64.2% 0.091 201.7)
- #BE7674
#BE7674
oklch(64.2% 0.091 21.6)
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 #399DA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea #3C9992 ΔE 0.026
- Cadet Blue #5F9EA0 ΔE 0.031
- Persian Green #2A9D8F ΔE 0.035
- Blue Green #0F9B8E ΔE 0.040
- Teal Green #0A9396 ΔE 0.041
- Dull Teal #5F9E8F ΔE 0.042
- Grey Teal #5E9B8A ΔE 0.044
- Dusty Teal #4C9085 ΔE 0.050
Use #399DA4 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.