#3981A3
Closest named color: Cerulean (#457B9D). oklch(57.2% 0.088 231.7), rgb(57, 129, 163).
Aa
Black text reads best on this color (4.84:1).
About this color
#3981A3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.088 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.018 away. Black text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.84:1 |
| White text | 4.33:1 |
Values
| HEX | #3981A3 |
| RGB | rgb(57, 129, 163) |
| HSL | hsl(199, 48%, 43%) |
| OKLCH | oklch(57.2% 0.088 231.7) |
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 #3981A3 | 4.33:1 | AA large text | Lc -75.3 | Fine for body text |
| Black text on #3981A3 | 4.84:1 | AA | Lc 34.3 | Non-text elements, placeholder text |
| #3981A3 text on white | 4.33:1 | AA large text | Lc 69.8 | Content text, not long reading |
| #3981A3 text on black | 4.84:1 | AA | Lc -31.9 | 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
#CBDCE5
oklch(88.4% 0.022 230.6)
-
Step 300
300
#A8C6D6
oklch(81% 0.039 231.2)
-
Step 400
400
#78A8C2
oklch(70.7% 0.064 232.5)
-
Step 500
500
#5292B2
oklch(63% 0.082 231.8)
-
Step 600
600 (this color)
#3981A3
oklch(57.2% 0.088 231.7)
-
Step 700
700
#256987
oklch(49.2% 0.082 231)
-
Step 800
800
#21556E
oklch(42.6% 0.069 232.5)
-
Step 900
900
#214759
oklch(37.8% 0.053 231)
-
Step 950
950
#142934
oklch(26.9% 0.034 232.8)
#3981A3 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) | #707FA5 | 0.060 |
| Deuteranopia (no green cones) | #6175A3 | 0.050 |
| Tritanopia (no blue cones) | #008A8C | 0.057 |
| Achromatopsia (no color) | #797979 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3981A3
#3981A3
oklch(57.2% 0.088 231.7)
- #A16845
#A16845
oklch(57.1% 0.089 51.7)
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 #3981A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.018
- Stormy Blue #507B9C ΔE 0.025
- Steel Blue #4682B4 ΔE 0.030
- Teal Blue #01889F ΔE 0.031
- Blue NCS #118AB2 ΔE 0.032
- Dull Blue #49759C ΔE 0.035
- Off Blue #5684AE ΔE 0.035
- Cool Blue #4984B8 ΔE 0.037
Use #3981A3 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.