#3F81AE
Closest named color: Steel Blue (#4682B4). oklch(58% 0.097 241), rgb(63, 129, 174).
Aa
Black text reads best on this color (4.96:1).
About this color
#3F81AE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.097 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.012 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.96:1 |
| White text | 4.23:1 |
Values
| HEX | #3F81AE |
| RGB | rgb(63, 129, 174) |
| HSL | hsl(204, 47%, 46%) |
| OKLCH | oklch(58% 0.097 241) |
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 #3F81AE | 4.23:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #3F81AE | 4.96:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #3F81AE text on white | 4.23:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #3F81AE text on black | 4.96:1 | AA | Lc -32.7 | 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
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDCE8
oklch(88.6% 0.024 240.1)
-
Step 300
300
#A8C5DB
oklch(80.9% 0.044 240.9)
-
Step 400
400
#79A7C8
oklch(70.8% 0.069 240.2)
-
Step 500
500
#5590BA
oklch(63% 0.089 241.1)
-
Step 600
600 (this color)
#3F81AE
oklch(58% 0.097 241)
-
Step 700
700
#29668F
oklch(49% 0.091 241.5)
-
Step 800
800
#245474
oklch(42.8% 0.074 240.8)
-
Step 900
900
#23455E
oklch(37.7% 0.059 242.4)
-
Step 950
950
#152937
oklch(27.1% 0.037 240.5)
#3F81AE 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) | #6D81B0 | 0.050 |
| Deuteranopia (no green cones) | #5E76AD | 0.041 |
| Tritanopia (no blue cones) | #008C90 | 0.071 |
| Achromatopsia (no color) | #7B7B7B | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F81AE
#3F81AE
oklch(58% 0.097 241)
- #A36C3A
#A36C3A
oklch(57.9% 0.096 61.3)
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 #3F81AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.012
- Cool Blue #4984B8 ΔE 0.020
- Off Blue #5684AE ΔE 0.025
- Cerulean #457B9D ΔE 0.028
- Stormy Blue #507B9C ΔE 0.030
- Blue NCS #118AB2 ΔE 0.031
- Dusty Blue #5A86AD ΔE 0.032
- Nice Blue #107AB0 ΔE 0.037
Use #3F81AE 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.