#3F9CBB
Closest named color: Cadet Blue (#5F9EA0). oklch(65% 0.098 223.5), rgb(63, 156, 187).
Aa
Black text reads best on this color (6.68:1).
About this color
#3F9CBB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 65%, its chroma 0.098 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Cadet Blue (#5F9EA0), ΔE 0.048 away. Black text reads best on it, at 6.68:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Cadet Blue (#5F9EA0) |
| Black text | 6.68:1 |
| White text | 3.14:1 |
Values
| HEX | #3F9CBB |
| RGB | rgb(63, 156, 187) |
| HSL | hsl(195, 50%, 49%) |
| OKLCH | oklch(65% 0.098 223.5) |
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 #3F9CBB | 3.14:1 | AA large text | Lc -63.6 | Content text, not long reading |
| Black text on #3F9CBB | 6.68:1 | AA | Lc 45.8 | Large or bold text, headings |
| #3F9CBB text on white | 3.14:1 | AA large text | Lc 58.2 | Large or bold text, headings |
| #3F9CBB text on black | 6.68:1 | AA | Lc -43.5 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF1
oklch(93.6% 0.014 226.6)
-
Step 200
200
#C7DDE6
oklch(88.4% 0.027 224.3)
-
Step 300
300
#A0C8D8
oklch(80.9% 0.048 224.2)
-
Step 400
400
#69ABC4
oklch(70.6% 0.076 224.2)
-
Step 500
500 (this color)
#3F9CBB
oklch(65% 0.098 223.5)
-
Step 600
600
#0080A0
oklch(55.7% 0.104 223.4)
-
Step 700
700
#006B87
oklch(49% 0.092 224)
-
Step 800
800
#00586F
oklch(42.7% 0.08 223.4)
-
Step 900
900
#0F495A
oklch(37.8% 0.063 222.4)
-
Step 950
950
#0C2B35
oklch(27.1% 0.04 222.7)
#3F9CBB 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) | #8A99BD | 0.077 |
| Deuteranopia (no green cones) | #798CBB | 0.068 |
| Tritanopia (no blue cones) | #00A6A6 | 0.054 |
| Achromatopsia (no color) | #919191 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F9CBB
#3F9CBB
oklch(65% 0.098 223.5)
- #C17B5D
#C17B5D
oklch(65% 0.098 43.8)
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 #3F9CBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cadet Blue #5F9EA0 ΔE 0.048
- Faded Blue #658CBB ΔE 0.053
- Greyblue #77A1B5 ΔE 0.056
- Turquoise Blue #06B1C4 ΔE 0.058
- Blue NCS #118AB2 ΔE 0.060
- Dusty Blue #5A86AD ΔE 0.061
- Sea #3C9992 ΔE 0.062
- Silver Lake Blue #778DA9 ΔE 0.063
Use #3F9CBB 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.