#3987DB
Closest named color: Dark Sky Blue (#448EE4). oklch(61.6% 0.149 252.8), rgb(57, 135, 219).
Aa
Black text reads best on this color (5.66:1).
About this color
#3987DB is a medium-dark, vivid blue. In OKLCH its lightness is 62%, its chroma 0.149 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.025 away. Black text reads best on it, at 5.66:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.66:1 |
| White text | 3.70:1 |
Values
| HEX | #3987DB |
| RGB | rgb(57, 135, 219) |
| HSL | hsl(211, 69%, 54%) |
| OKLCH | oklch(61.6% 0.149 252.8) |
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 #3987DB | 3.70:1 | AA large text | Lc -69.8 | Content text, not long reading |
| Black text on #3987DB | 5.66:1 | AA | Lc 39.8 | Non-text elements, placeholder text |
| #3987DB text on white | 3.70:1 | AA large text | Lc 64.3 | Content text, not long reading |
| #3987DB text on black | 5.66:1 | AA | Lc -37.4 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF4
oklch(88.4% 0.041 254)
-
Step 300
300
#A0C4EF
oklch(80.9% 0.072 253.1)
-
Step 400
400
#6AA4E7
oklch(70.7% 0.116 252.9)
-
Step 500
500 (this color)
#3987DB
oklch(61.6% 0.149 252.8)
-
Step 600
600
#1474CE
oklch(55.7% 0.161 252.7)
-
Step 700
700
#0161B2
oklch(49.2% 0.149 252.6)
-
Step 800
800
#0A4F90
oklch(42.6% 0.124 252.9)
-
Step 900
900
#144273
oklch(37.6% 0.097 253.1)
-
Step 950
950
#0E2743
oklch(26.9% 0.061 253.2)
#3987DB 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) | #608DDE | 0.041 |
| Deuteranopia (no green cones) | #467ED9 | 0.024 |
| Tritanopia (no blue cones) | #009BA6 | 0.113 |
| Achromatopsia (no color) | #858585 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3987DB
#3987DB
oklch(61.6% 0.149 252.8)
- #B47600
#B47600
oklch(61.6% 0.131 72.8)
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 #3987DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.025
- Water Blue #0E87CC ΔE 0.032
- Soft Blue #6488EA ΔE 0.048
- Chefchaouen Blue #4895EF ΔE 0.048
- Cool Blue #4984B8 ΔE 0.053
- Windows Blue #3778BF ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.055
- Steel Blue #4682B4 ΔE 0.059
Use #3987DB 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.