#3681AF
Closest named color: Steel Blue (#4682B4). oklch(57.7% 0.102 239.1), rgb(54, 129, 175).
Aa
Black text reads best on this color (4.91:1).
About this color
#3681AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.102 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.016 away. Black text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.91:1 |
| White text | 4.27:1 |
Values
| HEX | #3681AF |
| RGB | rgb(54, 129, 175) |
| HSL | hsl(203, 53%, 45%) |
| OKLCH | oklch(57.7% 0.102 239.1) |
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 #3681AF | 4.27:1 | AA large text | Lc -74.8 | Content text, not long reading |
| Black text on #3681AF | 4.91:1 | AA | Lc 34.8 | Non-text elements, placeholder text |
| #3681AF text on white | 4.27:1 | AA large text | Lc 69.3 | Content text, not long reading |
| #3681AF text on black | 4.91:1 | AA | Lc -32.4 | 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
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CBDCE8
oklch(88.5% 0.025 238.4)
-
Step 300
300
#A6C5DC
oklch(80.8% 0.047 240.3)
-
Step 400
400
#75A7CA
oklch(70.6% 0.074 239.7)
-
Step 500
500
#4F91BC
oklch(63.1% 0.094 239.2)
-
Step 600
600 (this color)
#3681AF
oklch(57.7% 0.102 239.1)
-
Step 700
700
#216790
oklch(49% 0.094 239.1)
-
Step 800
800
#1E5475
oklch(42.6% 0.078 239.4)
-
Step 900
900
#1F465F
oklch(37.8% 0.062 239.4)
-
Step 950
950
#132937
oklch(27% 0.038 238.3)
#3681AF 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) | #6C81B1 | 0.056 |
| Deuteranopia (no green cones) | #5B75AE | 0.046 |
| Tritanopia (no blue cones) | #008D91 | 0.071 |
| Achromatopsia (no color) | #7A7A7A | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3681AF
#3681AF
oklch(57.7% 0.102 239.1)
- #A66936
#A66936
oklch(57.7% 0.103 58.5)
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 #3681AF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.016
- Cool Blue #4984B8 ΔE 0.024
- Blue NCS #118AB2 ΔE 0.028
- Cerulean #457B9D ΔE 0.029
- Nice Blue #107AB0 ΔE 0.031
- Off Blue #5684AE ΔE 0.032
- Stormy Blue #507B9C ΔE 0.035
- Dusty Blue #5A86AD ΔE 0.039
Use #3681AF 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.