#3F7CDF
Closest named color: Clear Blue (#247AFD). oklch(59.7% 0.164 259.7), rgb(63, 124, 223).
Aa
Black text reads best on this color (5.15:1).
About this color
#3F7CDF is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.164 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.048 away. Black text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.15:1 |
| White text | 4.06:1 |
Values
| HEX | #3F7CDF |
| RGB | rgb(63, 124, 223) |
| HSL | hsl(217, 71%, 56%) |
| OKLCH | oklch(59.7% 0.164 259.7) |
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 #3F7CDF | 4.06:1 | AA large text | Lc -73.0 | Content text, not long reading |
| Black text on #3F7CDF | 5.15:1 | AA | Lc 36.6 | Non-text elements, placeholder text |
| #3F7CDF text on white | 4.06:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #3F7CDF text on black | 5.15:1 | AA | Lc -34.1 | 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
#C8DAF7
oklch(88.4% 0.045 259.9)
-
Step 300
300
#A2C2F5
oklch(80.9% 0.081 259.6)
-
Step 400
400
#70A1F0
oklch(70.8% 0.128 259.6)
-
Step 500
500 (this color)
#3F7CDF
oklch(59.7% 0.164 259.7)
-
Step 600
600
#2B6ED9
oklch(55.6% 0.178 259.6)
-
Step 700
700
#1E5BBC
oklch(49% 0.165 259.7)
-
Step 800
800
#1B4B98
oklch(42.7% 0.137 259.7)
-
Step 900
900
#1C3F79
oklch(37.6% 0.107 260)
-
Step 950
950
#112647
oklch(27.1% 0.067 259.1)
#3F7CDF 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) | #4A86E3 | 0.030 |
| Deuteranopia (no green cones) | #2A77DD | 0.022 |
| Tritanopia (no blue cones) | #0093A3 | 0.128 |
| Achromatopsia (no color) | #7E7E7E | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7CDF
#3F7CDF
oklch(59.7% 0.164 259.7)
- #A67500
#A67500
oklch(59.7% 0.124 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 #3F7CDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.048
- Royal Blue #4169E1 ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.049
- Water Blue #0E87CC ΔE 0.050
- Windows Blue #3778BF ΔE 0.050
- Soft Blue #6488EA ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.056
- Cornflower #6A79F7 ΔE 0.060
Use #3F7CDF 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.