#3F91D3
Closest named color: Dark Sky Blue (#448EE4). oklch(63.6% 0.127 246), rgb(63, 145, 211).
Aa
Black text reads best on this color (6.20:1).
About this color
#3F91D3 is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.127 and its hue 246°. 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 6.20:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.20:1 |
| White text | 3.38:1 |
Values
| HEX | #3F91D3 |
| RGB | rgb(63, 145, 211) |
| HSL | hsl(207, 63%, 54%) |
| OKLCH | oklch(63.6% 0.127 246) |
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 #3F91D3 | 3.38:1 | AA large text | Lc -66.5 | Content text, not long reading |
| Black text on #3F91D3 | 6.20:1 | AA | Lc 43.0 | Non-text elements, placeholder text |
| #3F91D3 text on white | 3.38:1 | AA large text | Lc 61.0 | Content text, not long reading |
| #3F91D3 text on black | 6.20:1 | AA | Lc -40.7 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C7DCEF
oklch(88.5% 0.035 245.5)
-
Step 300
300
#A0C5E7
oklch(80.8% 0.062 246.4)
-
Step 400
400
#6AA7DB
oklch(70.8% 0.099 245.5)
-
Step 500
500 (this color)
#3F91D3
oklch(63.6% 0.127 246)
-
Step 600
600
#0F78BE
oklch(55.5% 0.138 246)
-
Step 700
700
#0065A3
oklch(49.1% 0.126 245.9)
-
Step 800
800
#075385
oklch(42.8% 0.106 245.7)
-
Step 900
900
#13456B
oklch(37.8% 0.083 245.9)
-
Step 950
950
#0D283E
oklch(26.8% 0.053 246.1)
#3F91D3 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) | #7393D6 | 0.052 |
| Deuteranopia (no green cones) | #5F85D2 | 0.040 |
| Tritanopia (no blue cones) | #00A1A8 | 0.094 |
| Achromatopsia (no color) | #8B8B8B | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F91D3
#3F91D3
oklch(63.6% 0.127 246)
- #BE7925
#BE7925
oklch(63.5% 0.127 66.1)
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 #3F91D3, 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
- Water Blue #0E87CC ΔE 0.041
- Chefchaouen Blue #4895EF ΔE 0.043
- Faded Blue #658CBB ΔE 0.046
- Cool Blue #4984B8 ΔE 0.048
- Cornflower Blue #6495ED ΔE 0.054
- Steel Blue #4682B4 ΔE 0.056
- Soft Blue #6488EA ΔE 0.057
Use #3F91D3 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.