#3F83AA
Closest named color: Steel Blue (#4682B4). oklch(58.3% 0.091 236.4), rgb(63, 131, 170).
Aa
Black text reads best on this color (5.03:1).
About this color
#3F83AA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.091 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.018 away. Black text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.03:1 |
| White text | 4.16:1 |
Values
| HEX | #3F83AA |
| RGB | rgb(63, 131, 170) |
| HSL | hsl(202, 46%, 46%) |
| OKLCH | oklch(58.3% 0.091 236.4) |
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 #3F83AA | 4.16:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #3F83AA | 5.03:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #3F83AA text on white | 4.16:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #3F83AA text on black | 5.03:1 | AA | Lc -33.2 | 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 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE6
oklch(88.5% 0.022 235)
-
Step 300
300
#A8C5D8
oklch(80.8% 0.041 236.8)
-
Step 400
400
#79A7C5
oklch(70.6% 0.066 237.5)
-
Step 500
500
#5491B6
oklch(63% 0.084 236.8)
-
Step 600
600 (this color)
#3F83AA
oklch(58.3% 0.091 236.4)
-
Step 700
700
#28688A
oklch(49.2% 0.084 235.5)
-
Step 800
800
#235570
oklch(42.8% 0.07 235.3)
-
Step 900
900
#22465B
oklch(37.7% 0.055 236.3)
-
Step 950
950
#152935
oklch(27% 0.034 236.3)
#3F83AA 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) | #7182AC | 0.055 |
| Deuteranopia (no green cones) | #6277A9 | 0.047 |
| Tritanopia (no blue cones) | #008D90 | 0.064 |
| Achromatopsia (no color) | #7C7C7C | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F83AA
#3F83AA
oklch(58.3% 0.091 236.4)
- #A46C43
#A46C43
oklch(58.2% 0.091 56)
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 #3F83AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.018
- Off Blue #5684AE ΔE 0.024
- Cool Blue #4984B8 ΔE 0.024
- Cerulean #457B9D ΔE 0.026
- Blue NCS #118AB2 ΔE 0.027
- Stormy Blue #507B9C ΔE 0.029
- Dusty Blue #5A86AD ΔE 0.029
- Teal Blue #01889F ΔE 0.037
Use #3F83AA 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.