#3981B2
Closest named color: Steel Blue (#4682B4). oklch(57.9% 0.104 241.5), rgb(57, 129, 178).
Aa
Black text reads best on this color (4.95:1).
About this color
#3981B2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.104 and its hue 242°. 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 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.95:1 |
| White text | 4.23:1 |
Values
| HEX | #3981B2 |
| RGB | rgb(57, 129, 178) |
| HSL | hsl(204, 51%, 46%) |
| OKLCH | oklch(57.9% 0.104 241.5) |
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 #3981B2 | 4.23:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #3981B2 | 4.95:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #3981B2 text on white | 4.23:1 | AA large text | Lc 69.0 | Content text, not long reading |
| #3981B2 text on black | 4.95:1 | 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
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CBDCE9
oklch(88.6% 0.026 240.7)
-
Step 300
300
#A7C5DD
oklch(80.9% 0.047 242.4)
-
Step 400
400
#76A7CB
oklch(70.7% 0.074 241)
-
Step 500
500
#5090BE
oklch(63% 0.096 241.7)
-
Step 600
600 (this color)
#3981B2
oklch(57.9% 0.104 241.5)
-
Step 700
700
#236692
oklch(49% 0.097 241.7)
-
Step 800
800
#1F5477
oklch(42.8% 0.08 241.3)
-
Step 900
900
#204560
oklch(37.6% 0.063 242.6)
-
Step 950
950
#142938
oklch(27.1% 0.039 241.3)
#3981B2 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) | #6B82B4 | 0.053 |
| Deuteranopia (no green cones) | #5A76B1 | 0.041 |
| Tritanopia (no blue cones) | #008D92 | 0.074 |
| Achromatopsia (no color) | #7B7B7B | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3981B2
#3981B2
oklch(57.9% 0.104 241.5)
- #A66B33
#A66B33
oklch(58% 0.104 61.7)
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 #3981B2, 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 0.019
- Blue NCS #118AB2 ΔE 0.030
- Off Blue #5684AE ΔE 0.030
- Nice Blue #107AB0 ΔE 0.032
- Cerulean #457B9D ΔE 0.033
- Windows Blue #3778BF ΔE 0.037
- Stormy Blue #507B9C ΔE 0.037
Use #3981B2 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.