#3987D3
Closest named color: Water Blue (#0E87CC). oklch(61.1% 0.138 250.7), rgb(57, 135, 211).
Aa
Black text reads best on this color (5.58:1).
About this color
#3987D3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.138 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.023 away. Black text reads best on it, at 5.58:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.58:1 |
| White text | 3.76:1 |
Values
| HEX | #3987D3 |
| RGB | rgb(57, 135, 211) |
| HSL | hsl(210, 64%, 53%) |
| OKLCH | oklch(61.1% 0.138 250.7) |
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 #3987D3 | 3.76:1 | AA large text | Lc -70.3 | Content text, not long reading |
| Black text on #3987D3 | 5.58:1 | AA | Lc 39.2 | Non-text elements, placeholder text |
| #3987D3 text on white | 3.76:1 | AA large text | Lc 64.8 | Content text, not long reading |
| #3987D3 text on black | 5.58:1 | AA | Lc -36.8 | 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 500.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#A0C4EC
oklch(80.8% 0.069 251.4)
-
Step 400
400
#6BA5E2
oklch(70.7% 0.109 250.7)
-
Step 500
500 (this color)
#3987D3
oklch(61.1% 0.138 250.7)
-
Step 600
600
#1776C7
oklch(55.7% 0.15 250.5)
-
Step 700
700
#0362AC
oklch(49% 0.14 250.8)
-
Step 800
800
#0C518B
oklch(42.8% 0.115 250.3)
-
Step 900
900
#15436F
oklch(37.6% 0.09 250.8)
-
Step 950
950
#0E2841
oklch(27.1% 0.057 249.9)
#3987D3 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) | #648BD6 | 0.044 |
| Deuteranopia (no green cones) | #4D7DD2 | 0.029 |
| Tritanopia (no blue cones) | #0099A3 | 0.104 |
| Achromatopsia (no color) | #848484 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3987D3
#3987D3
oklch(61.1% 0.138 250.7)
- #B47300
#B47300
oklch(61% 0.132 70.6)
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 #3987D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.023
- Dark Sky Blue #448EE4 ΔE 0.032
- Cool Blue #4984B8 ΔE 0.041
- Steel Blue #4682B4 ΔE 0.047
- Windows Blue #3778BF ΔE 0.048
- Chefchaouen Blue #4895EF ΔE 0.055
- Soft Blue #6488EA ΔE 0.055
- Faded Blue #658CBB ΔE 0.058
Use #3987D3 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.