#3F7FE4
Closest named color: Dark Sky Blue (#448EE4). oklch(60.6% 0.167 259.3), rgb(63, 127, 228).
Aa
Black text reads best on this color (5.36:1).
About this color
#3F7FE4 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.167 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.041 away. Black text reads best on it, at 5.36:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.36:1 |
| White text | 3.91:1 |
Values
| HEX | #3F7FE4 |
| RGB | rgb(63, 127, 228) |
| HSL | hsl(217, 75%, 57%) |
| OKLCH | oklch(60.6% 0.167 259.3) |
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 #3F7FE4 | 3.91:1 | AA large text | Lc -71.7 | Content text, not long reading |
| Black text on #3F7FE4 | 5.36:1 | AA | Lc 37.9 | Non-text elements, placeholder text |
| #3F7FE4 text on white | 3.91:1 | AA large text | Lc 66.2 | Content text, not long reading |
| #3F7FE4 text on black | 5.36:1 | AA | Lc -35.5 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A1C2F6
oklch(80.8% 0.082 259.4)
-
Step 400
400
#6EA1F1
oklch(70.7% 0.13 259.1)
-
Step 500
500 (this color)
#3F7FE4
oklch(60.6% 0.167 259.3)
-
Step 600
600
#276EDB
oklch(55.6% 0.181 259.2)
-
Step 700
700
#1A5BBE
oklch(49.1% 0.169 259.3)
-
Step 800
800
#184B9A
oklch(42.7% 0.14 259.3)
-
Step 900
900
#1A3F7A
oklch(37.6% 0.109 259.5)
-
Step 950
950
#102648
oklch(27.1% 0.069 258.9)
#3F7FE4 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) | #4C89E8 | 0.031 |
| Deuteranopia (no green cones) | #2B7AE2 | 0.021 |
| Tritanopia (no blue cones) | #0097A6 | 0.132 |
| Achromatopsia (no color) | #818181 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7FE4
#3F7FE4
oklch(60.6% 0.167 259.3)
- #AA7800
#AA7800
oklch(60.8% 0.126 79.4)
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 #3F7FE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.041
- Clear Blue #247AFD ΔE 0.044
- Soft Blue #6488EA ΔE 0.047
- Water Blue #0E87CC ΔE 0.052
- Dodger Blue #1E90FF ΔE 0.055
- Royal Blue #4169E1 ΔE 0.056
- Cornflower #6A79F7 ΔE 0.056
- Windows Blue #3778BF ΔE 0.059
Use #3F7FE4 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.