#3F9FCB
Closest named color: Faded Blue (#658CBB). oklch(66.5% 0.11 231.7), rgb(63, 159, 203).
Aa
Black text reads best on this color (7.03:1).
About this color
#3F9FCB is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.110 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.057 away. Black text reads best on it, at 7.03:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 7.03:1 |
| White text | 2.98:1 |
Values
| HEX | #3F9FCB |
| RGB | rgb(63, 159, 203) |
| HSL | hsl(199, 57%, 52%) |
| OKLCH | oklch(66.5% 0.11 231.7) |
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 #3F9FCB | 2.98:1 | Fails | Lc -61.5 | Content text, not long reading |
| Black text on #3F9FCB | 7.03:1 | AAA | Lc 47.9 | Large or bold text, headings |
| #3F9FCB text on white | 2.98:1 | Fails | Lc 56.2 | Large or bold text, headings |
| #3F9FCB text on black | 7.03:1 | AAA | Lc -45.6 | Large or bold text, headings |
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
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C6DDEA
oklch(88.4% 0.03 232.5)
-
Step 300
300
#9EC7DE
oklch(80.8% 0.054 232.9)
-
Step 400
400
#66AACD
oklch(70.6% 0.086 232.2)
-
Step 500
500 (this color)
#3F9FCB
oklch(66.5% 0.11 231.7)
-
Step 600
600
#007EA9
oklch(55.6% 0.112 231.2)
-
Step 700
700
#006A8F
oklch(49.2% 0.1 231.3)
-
Step 800
800
#005676
oklch(42.6% 0.087 232.3)
-
Step 900
900
#0A4861
oklch(37.8% 0.072 231.5)
-
Step 950
950
#0A2A39
oklch(27% 0.046 232.6)
#3F9FCB 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) | #899DCD | 0.073 |
| Deuteranopia (no green cones) | #768FCA | 0.063 |
| Tritanopia (no blue cones) | #00ABAE | 0.067 |
| Achromatopsia (no color) | #959595 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F9FCB
#3F9FCB
oklch(66.5% 0.11 231.7)
- #C97F51
#C97F51
oklch(66.5% 0.111 51.7)
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 #3F9FCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.057
- Turquoise Blue #06B1C4 ΔE 0.057
- Greyblue #77A1B5 ΔE 0.060
- Cadet Blue #5F9EA0 ΔE 0.066
- Chefchaouen Blue #4895EF ΔE 0.067
- Dark Sky Blue #448EE4 ΔE 0.068
- Cornflower Blue #6495ED ΔE 0.072
- Blue NCS #118AB2 ΔE 0.073
Use #3F9FCB 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.