#399F99
Closest named color: Sea (#3C9992). oklch(64.3% 0.093 189.6), rgb(57, 159, 153).
Aa
Black text reads best on this color (6.59:1).
About this color
#399F99 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.093 and its hue 190°. Its hue sits on the cool side of the wheel. The nearest named color is Sea (#3C9992), ΔE 0.018 away. Black text reads best on it, at 6.59:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Sea (#3C9992) |
| Black text | 6.59:1 |
| White text | 3.18:1 |
Values
| HEX | #399F99 |
| RGB | rgb(57, 159, 153) |
| HSL | hsl(176, 47%, 42%) |
| OKLCH | oklch(64.3% 0.093 189.6) |
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 #399F99 | 3.18:1 | AA large text | Lc -64.1 | Content text, not long reading |
| Black text on #399F99 | 6.59:1 | AA | Lc 45.3 | Large or bold text, headings |
| #399F99 text on white | 3.18:1 | AA large text | Lc 58.7 | Large or bold text, headings |
| #399F99 text on black | 6.59:1 | AA | Lc -43.0 | 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
#F1F7F6
oklch(97.1% 0.006 185.3)
-
Step 100
100
#E1EDEC
oklch(93.7% 0.013 190.9)
-
Step 200
200
#C7DFDD
oklch(88.5% 0.026 190.6)
-
Step 300
300
#A0CBC7
oklch(81% 0.046 189.3)
-
Step 400
400
#68AFAA
oklch(70.6% 0.072 189.9)
-
Step 500
500 (this color)
#399F99
oklch(64.3% 0.093 189.6)
-
Step 600
600
#00857F
oklch(55.6% 0.096 189.2)
-
Step 700
700
#00706B
oklch(49.2% 0.085 189.4)
-
Step 800
800
#005C58
oklch(42.8% 0.074 189.6)
-
Step 900
900
#0B4C48
oklch(37.8% 0.061 188.5)
-
Step 950
950
#0B2C2A
oklch(26.9% 0.038 189.5)
#399F99 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) | #969799 | 0.098 |
| Deuteranopia (no green cones) | #878B9A | 0.094 |
| Tritanopia (no blue cones) | #00A39D | 0.019 |
| Achromatopsia (no color) | #909090 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399F99
#399F99
oklch(64.3% 0.093 189.6)
- #BE7580
#BE7580
oklch(64.3% 0.093 10.2)
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 #399F99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea #3C9992 ΔE 0.018
- Persian Green #2A9D8F ΔE 0.018
- Blue Green #0F9B8E ΔE 0.028
- Dull Teal #5F9E8F ΔE 0.031
- Grey Teal #5E9B8A ΔE 0.032
- Cadet Blue #5F9EA0 ΔE 0.034
- Teal Green #0A9396 ΔE 0.043
- Dusty Teal #4C9085 ΔE 0.044
Use #399F99 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.