#3987E9
Closest named color: Dark Sky Blue (#448EE4). oklch(62.5% 0.166 255.8), rgb(57, 135, 233).
Aa
Black text reads best on this color (5.81:1).
About this color
#3987E9 is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.166 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.024 away. Black text reads best on it, at 5.81:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.81:1 |
| White text | 3.61:1 |
Values
| HEX | #3987E9 |
| RGB | rgb(57, 135, 233) |
| HSL | hsl(213, 80%, 57%) |
| OKLCH | oklch(62.5% 0.166 255.8) |
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 #3987E9 | 3.61:1 | AA large text | Lc -68.8 | Content text, not long reading |
| Black text on #3987E9 | 5.81:1 | AA | Lc 40.8 | Non-text elements, placeholder text |
| #3987E9 text on white | 3.61:1 | AA large text | Lc 63.3 | Content text, not long reading |
| #3987E9 text on black | 5.81:1 | AA | Lc -38.4 | 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 500.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9EC3F5
oklch(80.8% 0.082 256.1)
-
Step 400
400
#68A3F0
oklch(70.8% 0.129 255.6)
-
Step 500
500 (this color)
#3987E9
oklch(62.5% 0.166 255.8)
-
Step 600
600
#1070DA
oklch(55.6% 0.182 256)
-
Step 700
700
#005DBC
oklch(49% 0.167 256)
-
Step 800
800
#074D99
oklch(42.8% 0.139 255.8)
-
Step 900
900
#124179
oklch(37.7% 0.108 255.4)
-
Step 950
950
#0D2647
oklch(26.9% 0.069 256.4)
#3987E9 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) | #578FED | 0.036 |
| Deuteranopia (no green cones) | #377FE7 | 0.021 |
| Tritanopia (no blue cones) | #009EAD | 0.127 |
| Achromatopsia (no color) | #878787 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3987E9
#3987E9
oklch(62.5% 0.166 255.8)
- #B47A00
#B47A00
oklch(62.4% 0.131 75.7)
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 #3987E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.024
- Dodger Blue #1E90FF ΔE 0.037
- Soft Blue #6488EA ΔE 0.040
- Chefchaouen Blue #4895EF ΔE 0.041
- Clear Blue #247AFD ΔE 0.050
- Water Blue #0E87CC ΔE 0.050
- Cornflower Blue #6495ED ΔE 0.058
- Cornflower #6A79F7 ΔE 0.061
Use #3987E9 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.