#399DAB
Closest named color: Cadet Blue (#5F9EA0). oklch(64.4% 0.093 208.2), rgb(57, 157, 171).
Aa
Black text reads best on this color (6.58:1).
About this color
#399DAB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.093 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.034 away. Black text reads best on it, at 6.58:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.58:1 |
| White text | 3.18:1 |
Values
| HEX | #399DAB |
| RGB | rgb(57, 157, 171) |
| HSL | hsl(187, 50%, 45%) |
| OKLCH | oklch(64.4% 0.093 208.2) |
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 #399DAB | 3.18:1 | AA large text | Lc -64.2 | Content text, not long reading |
| Black text on #399DAB | 6.58:1 | AA | Lc 45.3 | Large or bold text, headings |
| #399DAB text on white | 3.18:1 | AA large text | Lc 58.8 | Large or bold text, headings |
| #399DAB text on black | 6.58:1 | 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
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E0ECEE
oklch(93.5% 0.013 208.8)
-
Step 200
200
#C7DEE2
oklch(88.5% 0.025 209.3)
-
Step 300
300
#9FC9D0
oklch(80.8% 0.045 208.8)
-
Step 400
400
#67AEB8
oklch(70.8% 0.073 207.2)
-
Step 500
500 (this color)
#399DAB
oklch(64.4% 0.093 208.2)
-
Step 600
600
#008291
oklch(55.5% 0.096 208.9)
-
Step 700
700
#006E7A
oklch(49.2% 0.085 207.9)
-
Step 800
800
#005A64
oklch(42.8% 0.073 207.9)
-
Step 900
900
#0B4A52
oklch(37.6% 0.06 208.1)
-
Step 950
950
#0B2C30
oklch(27.1% 0.038 206.4)
#399DAB 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) | #9097AC | 0.090 |
| Deuteranopia (no green cones) | #7F8BAB | 0.081 |
| Tritanopia (no blue cones) | #00A4A1 | 0.034 |
| Achromatopsia (no color) | #909090 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399DAB
#399DAB
oklch(64.4% 0.093 208.2)
- #BF776D
#BF776D
oklch(64.3% 0.092 28.4)
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 #399DAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.034
- Sea #3C9992 ΔE 0.036
- Persian Green #2A9D8F ΔE 0.045
- Teal Green #0A9396 ΔE 0.046
- Dull Teal #5F9E8F ΔE 0.050
- Blue Green #0F9B8E ΔE 0.050
- Grey Teal #5E9B8A ΔE 0.052
- Dusty Teal #4C9085 ΔE 0.058
Use #399DAB 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.