#3187ED
Closest named color: Dark Sky Blue (#448EE4). oklch(62.5% 0.174 255.2), rgb(49, 135, 237).
Aa
Black text reads best on this color (5.81:1).
About this color
#3187ED is a medium-light, vivid blue. In OKLCH its lightness is 62%, its chroma 0.174 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.029 away. Black text reads best on it, at 5.81:1.
| Hue family | Blues |
| Lightness | medium-light (62%) |
| Chroma | vivid (0.174) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.81:1 |
| White text | 3.60:1 |
Values
| HEX | #3187ED |
| RGB | rgb(49, 135, 237) |
| HSL | hsl(213, 84%, 56%) |
| OKLCH | oklch(62.5% 0.174 255.2) |
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 #3187ED | 3.60:1 | AA large text | Lc -68.7 | Content text, not long reading |
| Black text on #3187ED | 5.81:1 | AA | Lc 40.9 | Non-text elements, placeholder text |
| #3187ED text on white | 3.60:1 | AA large text | Lc 63.2 | Content text, not long reading |
| #3187ED text on black | 5.81:1 | AA | Lc -38.5 | 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 500.
-
Step 50
50
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBF9
oklch(88.5% 0.048 256.2)
-
Step 300
300
#9CC4F7
oklch(81% 0.084 254.7)
-
Step 400
400
#63A3F3
oklch(70.7% 0.135 254.8)
-
Step 500
500 (this color)
#3187ED
oklch(62.5% 0.174 255.2)
-
Step 600
600
#0070DB
oklch(55.5% 0.184 255.3)
-
Step 700
700
#005EBA
oklch(49.1% 0.163 255.3)
-
Step 800
800
#004D9A
oklch(42.7% 0.142 255.2)
-
Step 900
900
#0C417C
oklch(37.8% 0.113 255)
-
Step 950
950
#0A2648
oklch(26.9% 0.072 255.3)
#3187ED 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) | #5390F1 | 0.039 |
| Deuteranopia (no green cones) | #2D7FEB | 0.022 |
| Tritanopia (no blue cones) | #009FAE | 0.131 |
| Achromatopsia (no color) | #878787 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3187ED
#3187ED
oklch(62.5% 0.174 255.2)
- #B57A00
#B57A00
oklch(62.5% 0.132 75.1)
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 #3187ED, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.029
- Dodger Blue #1E90FF ΔE 0.032
- Chefchaouen Blue #4895EF ΔE 0.043
- Clear Blue #247AFD ΔE 0.045
- Soft Blue #6488EA ΔE 0.045
- Water Blue #0E87CC ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.062
- Cornflower #6A79F7 ΔE 0.062
Use #3187ED 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.