#3F9AAA
Closest named color: Cadet Blue (#5F9EA0). oklch(63.8% 0.088 211), rgb(63, 154, 170).
Aa
Black text reads best on this color (6.41:1).
About this color
#3F9AAA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 64%, its chroma 0.088 and its hue 211°. 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 6.41:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.41:1 |
| White text | 3.27:1 |
Values
| HEX | #3F9AAA |
| RGB | rgb(63, 154, 170) |
| HSL | hsl(189, 46%, 46%) |
| OKLCH | oklch(63.8% 0.088 211) |
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 #3F9AAA | 3.27:1 | AA large text | Lc -65.3 | Content text, not long reading |
| Black text on #3F9AAA | 6.41:1 | AA | Lc 44.2 | Non-text elements, placeholder text |
| #3F9AAA text on white | 3.27:1 | AA large text | Lc 59.8 | Large or bold text, headings |
| #3F9AAA text on black | 6.41:1 | AA | Lc -41.9 | 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
#E1ECEF
oklch(93.6% 0.012 215.8)
-
Step 200
200
#C8DEE2
oklch(88.5% 0.024 209.8)
-
Step 300
300
#A1C9D0
oklch(80.9% 0.043 209.4)
-
Step 400
400
#6BADB9
oklch(70.8% 0.069 210.3)
-
Step 500
500 (this color)
#3F9AAA
oklch(63.8% 0.088 211)
-
Step 600
600
#038293
oklch(55.6% 0.096 210.8)
-
Step 700
700
#006D7C
oklch(49% 0.085 211.2)
-
Step 800
800
#015966
oklch(42.6% 0.074 211.8)
-
Step 900
900
#124A53
oklch(37.8% 0.058 210.5)
-
Step 950
950
#0D2B31
oklch(27% 0.037 212.9)
#3F9AAA 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) | #8D95AB | 0.083 |
| Deuteranopia (no green cones) | #7D89AA | 0.075 |
| Tritanopia (no blue cones) | #00A19F | 0.037 |
| Achromatopsia (no color) | #8E8E8E | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F9AAA
#3F9AAA
oklch(63.8% 0.088 211)
- #BB776B
#BB776B
oklch(63.8% 0.088 30.6)
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 #3F9AAA, 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 0.044
- Persian Green #2A9D8F ΔE 0.048
- Dull Teal #5F9E8F ΔE 0.051
- Blue Green #0F9B8E ΔE 0.052
- Grey Teal #5E9B8A ΔE 0.053
- Dusty Teal #4C9085 ΔE 0.054
Use #3F9AAA 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.