#3F9FA4
Closest named color: Cadet Blue (#5F9EA0). oklch(64.8% 0.089 200), rgb(63, 159, 164).
Aa
Black text reads best on this color (6.70:1).
About this color
#3F9FA4 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.089 and its hue 200°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.026 away. Black text reads best on it, at 6.70:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.70:1 |
| White text | 3.13:1 |
Values
| HEX | #3F9FA4 |
| RGB | rgb(63, 159, 164) |
| HSL | hsl(183, 44%, 45%) |
| OKLCH | oklch(64.8% 0.089 200) |
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 #3F9FA4 | 3.13:1 | AA large text | Lc -63.5 | Content text, not long reading |
| Black text on #3F9FA4 | 6.70:1 | AA | Lc 46.0 | Large or bold text, headings |
| #3F9FA4 text on white | 3.13:1 | AA large text | Lc 58.1 | Large or bold text, headings |
| #3F9FA4 text on black | 6.70:1 | AA | Lc -43.6 | 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
#C8DEDF
oklch(88.5% 0.024 200.1)
-
Step 300
300
#A1CACC
oklch(81% 0.043 200)
-
Step 400
400
#6AAEB2
oklch(70.7% 0.069 200.5)
-
Step 500
500 (this color)
#3F9FA4
oklch(64.8% 0.089 200)
-
Step 600
600
#008489
oklch(55.7% 0.095 199.5)
-
Step 700
700
#006F73
oklch(49.2% 0.084 199.2)
-
Step 800
800
#005B5F
oklch(42.8% 0.073 200)
-
Step 900
900
#0F4B4E
oklch(37.8% 0.058 200)
-
Step 950
950
#0C2C2D
oklch(27% 0.037 198.1)
#3F9FA4 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) | #9498A4 | 0.091 |
| Deuteranopia (no green cones) | #848DA5 | 0.083 |
| Tritanopia (no blue cones) | #00A4A0 | 0.027 |
| Achromatopsia (no color) | #929292 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F9FA4
#3F9FA4
oklch(64.8% 0.089 200)
- #BF7878
#BF7878
oklch(64.8% 0.089 19.8)
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 #3F9FA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.026
- Sea #3C9992 ΔE 0.029
- Persian Green #2A9D8F ΔE 0.035
- Dull Teal #5F9E8F ΔE 0.037
- Grey Teal #5E9B8A ΔE 0.041
- Blue Green #0F9B8E ΔE 0.043
- Teal Green #0A9396 ΔE 0.048
- Dusty Teal #4C9085 ΔE 0.053
Use #3F9FA4 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.