#3987AC
Closest named color: Blue NCS (#118AB2). oklch(59.1% 0.094 232.1), rgb(57, 135, 172).
Aa
Black text reads best on this color (5.23:1).
About this color
#3987AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.094 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.019 away. Black text reads best on it, at 5.23:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.23:1 |
| White text | 4.01:1 |
Values
| HEX | #3987AC |
| RGB | rgb(57, 135, 172) |
| HSL | hsl(199, 50%, 45%) |
| OKLCH | oklch(59.1% 0.094 232.1) |
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 #3987AC | 4.01:1 | AA large text | Lc -72.7 | Content text, not long reading |
| Black text on #3987AC | 5.23:1 | AA | Lc 36.9 | Non-text elements, placeholder text |
| #3987AC text on white | 4.01:1 | AA large text | Lc 67.2 | Content text, not long reading |
| #3987AC text on black | 5.23:1 | AA | Lc -34.5 | 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
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CADCE6
oklch(88.4% 0.024 231.9)
-
Step 300
300
#A6C6D8
oklch(80.9% 0.043 232.7)
-
Step 400
400
#75A9C4
oklch(70.8% 0.068 231.6)
-
Step 500
500
#4E93B5
oklch(63.2% 0.086 231.8)
-
Step 600
600 (this color)
#3987AC
oklch(59.1% 0.094 232.1)
-
Step 700
700
#1E698A
oklch(49.1% 0.088 232)
-
Step 800
800
#1C5670
oklch(42.8% 0.073 231.5)
-
Step 900
900
#1E475B
oklch(37.8% 0.057 232.2)
-
Step 950
950
#132A35
oklch(27.2% 0.035 230.7)
#3987AC 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) | #7585AE | 0.063 |
| Deuteranopia (no green cones) | #657AAB | 0.053 |
| Tritanopia (no blue cones) | #009193 | 0.060 |
| Achromatopsia (no color) | #7F7F7F | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3987AC
#3987AC
oklch(59.1% 0.094 232.1)
- #AA6D46
#AA6D46
oklch(59.2% 0.095 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 #3987AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.019
- Steel Blue #4682B4 ΔE 0.024
- Cool Blue #4984B8 ΔE 0.027
- Off Blue #5684AE ΔE 0.027
- Dusty Blue #5A86AD ΔE 0.030
- Teal Blue #01889F ΔE 0.033
- Cerulean #457B9D ΔE 0.036
- Stormy Blue #507B9C ΔE 0.038
Use #3987AC 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.