#3F7DDC
Closest named color: Water Blue (#0E87CC). oklch(59.7% 0.159 258.8), rgb(63, 125, 220).
Aa
Black text reads best on this color (5.17:1).
About this color
#3F7DDC is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.159 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.045 away. Black text reads best on it, at 5.17:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.17:1 |
| White text | 4.05:1 |
Values
| HEX | #3F7DDC |
| RGB | rgb(63, 125, 220) |
| HSL | hsl(216, 69%, 55%) |
| OKLCH | oklch(59.7% 0.159 258.8) |
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 #3F7DDC | 4.05:1 | AA large text | Lc -72.9 | Content text, not long reading |
| Black text on #3F7DDC | 5.17:1 | AA | Lc 36.7 | Non-text elements, placeholder text |
| #3F7DDC text on white | 4.05:1 | AA large text | Lc 67.4 | Content text, not long reading |
| #3F7DDC text on black | 5.17:1 | AA | Lc -34.2 | 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
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DAF6
oklch(88.4% 0.043 259.2)
-
Step 300
300
#A3C2F3
oklch(80.9% 0.077 259.4)
-
Step 400
400
#70A1ED
oklch(70.6% 0.124 258.9)
-
Step 500
500 (this color)
#3F7DDC
oklch(59.7% 0.159 258.8)
-
Step 600
600
#2B6FD6
oklch(55.6% 0.173 258.9)
-
Step 700
700
#1D5CB9
oklch(49% 0.16 258.8)
-
Step 800
800
#1A4C96
oklch(42.7% 0.133 258.6)
-
Step 900
900
#1C4077
oklch(37.7% 0.103 258.8)
-
Step 950
950
#112646
oklch(27% 0.066 258.6)
#3F7DDC 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) | #4E86E0 | 0.030 |
| Deuteranopia (no green cones) | #3277DA | 0.021 |
| Tritanopia (no blue cones) | #0093A2 | 0.124 |
| Achromatopsia (no color) | #7E7E7E | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7DDC
#3F7DDC
oklch(59.7% 0.159 258.8)
- #A77500
#A77500
oklch(59.8% 0.124 78.8)
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 #3F7DDC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.045
- Windows Blue #3778BF ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.047
- Royal Blue #4169E1 ΔE 0.053
- Clear Blue #247AFD ΔE 0.053
- Soft Blue #6488EA ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.060
- Cool Blue #4984B8 ΔE 0.063
Use #3F7DDC 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.