#3F81A2
Closest named color: Cerulean (#457B9D). oklch(57.4% 0.084 232.6), rgb(63, 129, 162).
Aa
Black text reads best on this color (4.87:1).
About this color
#3F81A2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.084 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.017 away. Black text reads best on it, at 4.87:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.87:1 |
| White text | 4.30:1 |
Values
| HEX | #3F81A2 |
| RGB | rgb(63, 129, 162) |
| HSL | hsl(200, 44%, 44%) |
| OKLCH | oklch(57.4% 0.084 232.6) |
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 #3F81A2 | 4.30:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #3F81A2 | 4.87:1 | AA | Lc 34.5 | Non-text elements, placeholder text |
| #3F81A2 text on white | 4.30:1 | AA large text | Lc 69.6 | Content text, not long reading |
| #3F81A2 text on black | 4.87:1 | AA | Lc -32.0 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CCDCE5
oklch(88.5% 0.021 232.2)
-
Step 300
300
#A9C5D5
oklch(80.8% 0.038 233)
-
Step 400
400
#7AA8C0
oklch(70.7% 0.06 231.4)
-
Step 500
500
#5792B1
oklch(63.2% 0.077 232.8)
-
Step 600
600 (this color)
#3F81A2
oklch(57.4% 0.084 232.6)
-
Step 700
700
#2B6886
oklch(49.1% 0.079 233)
-
Step 800
800
#25556D
oklch(42.7% 0.065 232.9)
-
Step 900
900
#244658
oklch(37.7% 0.05 233.4)
-
Step 950
950
#162934
oklch(27% 0.032 235.1)
#3F81A2 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) | #7180A4 | 0.056 |
| Deuteranopia (no green cones) | #6375A2 | 0.049 |
| Tritanopia (no blue cones) | #008A8C | 0.058 |
| Achromatopsia (no color) | #7A7A7A | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F81A2
#3F81A2
oklch(57.4% 0.084 232.6)
- #A06A48
#A06A48
oklch(57.4% 0.084 52.5)
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 #3F81A2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.017
- Stormy Blue #507B9C ΔE 0.021
- Steel Blue #4682B4 ΔE 0.029
- Off Blue #5684AE ΔE 0.032
- Teal Blue #01889F ΔE 0.033
- Dull Blue #49759C ΔE 0.034
- Blue NCS #118AB2 ΔE 0.034
- Cool Blue #4984B8 ΔE 0.036
Use #3F81A2 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.