#3F83AE
Closest named color: Steel Blue (#4682B4). oklch(58.4% 0.095 239.1), rgb(63, 131, 174).
Aa
Black text reads best on this color (5.06:1).
About this color
#3F83AE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.095 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.013 away. Black text reads best on it, at 5.06:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.06:1 |
| White text | 4.14:1 |
Values
| HEX | #3F83AE |
| RGB | rgb(63, 131, 174) |
| HSL | hsl(203, 47%, 46%) |
| OKLCH | oklch(58.4% 0.095 239.1) |
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 #3F83AE | 4.14:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #3F83AE | 5.06:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #3F83AE text on white | 4.14:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #3F83AE text on black | 5.06:1 | AA | Lc -33.4 | 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
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A8C5DA
oklch(80.9% 0.043 239.6)
-
Step 400
400
#78A7C7
oklch(70.7% 0.069 238.8)
-
Step 500
500
#5491B9
oklch(63.2% 0.088 239)
-
Step 600
600 (this color)
#3F83AE
oklch(58.4% 0.095 239.1)
-
Step 700
700
#28678D
oklch(49.1% 0.088 238.8)
-
Step 800
800
#235473
oklch(42.7% 0.074 239.5)
-
Step 900
900
#22465D
oklch(37.8% 0.057 238.8)
-
Step 950
950
#152936
oklch(27% 0.036 238.5)
#3F83AE 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) | #6F83B0 | 0.052 |
| Deuteranopia (no green cones) | #6078AD | 0.043 |
| Tritanopia (no blue cones) | #008E92 | 0.068 |
| Achromatopsia (no color) | #7D7D7D | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F83AE
#3F83AE
oklch(58.4% 0.095 239.1)
- #A56D3E
#A56D3E
oklch(58.4% 0.095 59.3)
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 #3F83AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.013
- Cool Blue #4984B8 ΔE 0.019
- Off Blue #5684AE ΔE 0.023
- Blue NCS #118AB2 ΔE 0.027
- Dusty Blue #5A86AD ΔE 0.029
- Cerulean #457B9D ΔE 0.030
- Stormy Blue #507B9C ΔE 0.032
- Nice Blue #107AB0 ΔE 0.041
Use #3F83AE 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.