#3F87EE
Closest named color: Dark Sky Blue (#448EE4). oklch(63% 0.171 257.8), rgb(63, 135, 238).
Aa
Black text reads best on this color (5.91:1).
About this color
#3F87EE is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.171 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.027 away. Black text reads best on it, at 5.91:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.91:1 |
| White text | 3.55:1 |
Values
| HEX | #3F87EE |
| RGB | rgb(63, 135, 238) |
| HSL | hsl(215, 84%, 59%) |
| OKLCH | oklch(63% 0.171 257.8) |
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 #3F87EE | 3.55:1 | AA large text | Lc -68.2 | Content text, not long reading |
| Black text on #3F87EE | 5.91:1 | AA | Lc 41.4 | Non-text elements, placeholder text |
| #3F87EE text on white | 3.55:1 | AA large text | Lc 62.7 | Content text, not long reading |
| #3F87EE text on black | 5.91:1 | AA | Lc -39.0 | 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
#C6DBF8
oklch(88.5% 0.046 256.5)
-
Step 300
300
#9FC3F7
oklch(81% 0.084 257.5)
-
Step 400
400
#6AA1F3
oklch(70.6% 0.134 258.2)
-
Step 500
500 (this color)
#3F87EE
oklch(63% 0.171 257.8)
-
Step 600
600
#1B6EDD
oklch(55.5% 0.186 257.9)
-
Step 700
700
#0B5CC0
oklch(49.2% 0.172 257.7)
-
Step 800
800
#0F4B9B
oklch(42.6% 0.143 257.9)
-
Step 900
900
#15407B
oklch(37.7% 0.111 257.5)
-
Step 950
950
#0E2648
oklch(27% 0.07 257.6)
#3F87EE 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) | #5391F2 | 0.034 |
| Deuteranopia (no green cones) | #3280EC | 0.022 |
| Tritanopia (no blue cones) | #009FAF | 0.132 |
| Achromatopsia (no color) | #888888 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F87EE
#3F87EE
oklch(63% 0.171 257.8)
- #B47D00
#B47D00
oklch(62.9% 0.131 77.8)
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 #3F87EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.027
- Dodger Blue #1E90FF ΔE 0.033
- Soft Blue #6488EA ΔE 0.036
- Chefchaouen Blue #4895EF ΔE 0.039
- Clear Blue #247AFD ΔE 0.047
- Cornflower #6A79F7 ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.055
- Water Blue #0E87CC ΔE 0.059
Use #3F87EE 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.