#399CAB
Closest named color: Cadet Blue (#5F9EA0). oklch(64.2% 0.092 209.2), rgb(57, 156, 171).
Aa
Black text reads best on this color (6.51:1).
About this color
#399CAB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.092 and its hue 209°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.035 away. Black text reads best on it, at 6.51:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.51:1 |
| White text | 3.22:1 |
Values
| HEX | #399CAB |
| RGB | rgb(57, 156, 171) |
| HSL | hsl(188, 50%, 45%) |
| OKLCH | oklch(64.2% 0.092 209.2) |
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 #399CAB | 3.22:1 | AA large text | Lc -64.6 | Content text, not long reading |
| Black text on #399CAB | 6.51:1 | AA | Lc 44.9 | Non-text elements, placeholder text |
| #399CAB text on white | 3.22:1 | AA large text | Lc 59.2 | Large or bold text, headings |
| #399CAB text on black | 6.51:1 | 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
#F1F7F8
oklch(97.2% 0.007 208.8)
-
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
#68ADB9
oklch(70.6% 0.072 209.8)
-
Step 500
500 (this color)
#399CAB
oklch(64.2% 0.092 209.2)
-
Step 600
600
#008292
oklch(55.6% 0.096 209.8)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
Step 800
800
#005A65
oklch(42.8% 0.074 209.1)
-
Step 900
900
#0C4A53
oklch(37.7% 0.06 209.8)
-
Step 950
950
#0B2B30
oklch(26.8% 0.038 209.5)
#399CAB 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) | #8F96AC | 0.089 |
| Deuteranopia (no green cones) | #7E8AAB | 0.080 |
| Tritanopia (no blue cones) | #00A3A0 | 0.035 |
| Achromatopsia (no color) | #8F8F8F | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #399CAB
#399CAB
oklch(64.2% 0.092 209.2)
- #BE776C
#BE776C
oklch(64.2% 0.092 29.4)
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 #399CAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.035
- Sea #3C9992 ΔE 0.037
- Teal Green #0A9396 ΔE 0.045
- Persian Green #2A9D8F ΔE 0.046
- Blue Green #0F9B8E ΔE 0.050
- Dull Teal #5F9E8F ΔE 0.051
- Grey Teal #5E9B8A ΔE 0.053
- Dusty Teal #4C9085 ΔE 0.057
Use #399CAB 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.