#3F9EB4
Closest named color: Cadet Blue (#5F9EA0). oklch(65.2% 0.093 215.8), rgb(63, 158, 180).
Aa
Black text reads best on this color (6.76:1).
About this color
#3F9EB4 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.093 and its hue 216°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.037 away. Black text reads best on it, at 6.76:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.76:1 |
| White text | 3.10:1 |
Values
| HEX | #3F9EB4 |
| RGB | rgb(63, 158, 180) |
| HSL | hsl(191, 48%, 48%) |
| OKLCH | oklch(65.2% 0.093 215.8) |
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 #3F9EB4 | 3.10:1 | AA large text | Lc -63.2 | Content text, not long reading |
| Black text on #3F9EB4 | 6.76:1 | AA | Lc 46.3 | Large or bold text, headings |
| #3F9EB4 text on white | 3.10:1 | AA large text | Lc 57.8 | Large or bold text, headings |
| #3F9EB4 text on black | 6.76:1 | AA | Lc -44.0 | 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
#F1F7F8
oklch(97.2% 0.007 208.8)
-
Step 100
100
#E1ECEF
oklch(93.6% 0.012 215.8)
-
Step 200
200
#C7DEE4
oklch(88.5% 0.026 215.2)
-
Step 300
300
#A0C9D3
oklch(81% 0.046 214.2)
-
Step 400
400
#69ACBE
oklch(70.6% 0.073 216.8)
-
Step 500
500 (this color)
#3F9EB4
oklch(65.2% 0.093 215.8)
-
Step 600
600
#008198
oklch(55.6% 0.099 216.1)
-
Step 700
700
#006D80
oklch(49.2% 0.087 215.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900
#0E4956
oklch(37.6% 0.061 216.5)
-
Step 950
950
#0C2B32
oklch(27% 0.038 215.2)
#3F9EB4 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) | #8F99B5 | 0.083 |
| Deuteranopia (no green cones) | #7E8DB4 | 0.075 |
| Tritanopia (no blue cones) | #00A6A5 | 0.043 |
| Achromatopsia (no color) | #929292 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F9EB4
#3F9EB4
oklch(65.2% 0.093 215.8)
- #C27B68
#C27B68
oklch(65.3% 0.094 35.7)
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 #3F9EB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.037
- Sea #3C9992 ΔE 0.051
- Turquoise Blue #06B1C4 ΔE 0.053
- Greyblue #77A1B5 ΔE 0.054
- Dull Teal #5F9E8F ΔE 0.059
- Teal Green #0A9396 ΔE 0.059
- Persian Green #2A9D8F ΔE 0.060
- Faded Blue #658CBB ΔE 0.062
Use #3F9EB4 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.