#3870FB
Closest named color: Clear Blue (#247AFD). oklch(59% 0.216 264.2), rgb(56, 112, 251).
Aa
Black text reads best on this color (4.87:1).
About this color
#3870FB is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.216 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.024 away. Black text reads best on it, at 4.87:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.216) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 4.87:1 |
| White text | 4.30:1 |
Values
| HEX | #3870FB |
| RGB | rgb(56, 112, 251) |
| HSL | hsl(223, 96%, 60%) |
| OKLCH | oklch(59% 0.216 264.2) |
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 #3870FB | 4.30:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #3870FB | 4.87:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #3870FB text on white | 4.30:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #3870FB text on black | 4.87:1 | AA | Lc -32.5 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C7DAFE
oklch(88.6% 0.054 263.2)
-
Step 300
300
#A2C0FF
oklch(80.9% 0.096 264.7)
-
Step 400
400
#709DFF
oklch(70.7% 0.152 264.2)
-
Step 500
500
#4A80FF
oklch(63.1% 0.198 264.2)
-
Step 600
600 (this color)
#3870FB
oklch(59% 0.216 264.2)
-
Step 700
700
#2253D0
oklch(49.2% 0.2 264)
-
Step 800
800
#1D45A8
oklch(42.8% 0.166 264)
-
Step 900
900
#1D3B85
oklch(37.7% 0.13 264.4)
-
Step 950
950
#11234E
oklch(26.9% 0.083 264.4)
#3870FB 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) | #0083FF | 0.046 |
| Deuteranopia (no green cones) | #0071F8 | 0.024 |
| Tritanopia (no blue cones) | #0093AB | 0.169 |
| Achromatopsia (no color) | #7A7A7A | 0.216 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3870FB
#3870FB
oklch(59% 0.216 264.2)
- #9F7600
#9F7600
oklch(59.1% 0.121 84.2)
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 #3870FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.024
- Cerulean Blue #056EEE ΔE 0.033
- Neon Blue #4361EE ΔE 0.038
- Bright Blue #0165FC ΔE 0.040
- Royal Blue #4169E1 ΔE 0.042
- Azul #1D5DEC ΔE 0.057
- Cornflower #6A79F7 ΔE 0.061
- Warm Blue #4B57DB ΔE 0.073
Use #3870FB 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.