#3F7FD7
Closest named color: Water Blue (#0E87CC). oklch(59.8% 0.15 257), rgb(63, 127, 215).
Aa
Black text reads best on this color (5.22:1).
About this color
#3F7FD7 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.150 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Water Blue (#0E87CC), ΔE 0.037 away. Black text reads best on it, at 5.22:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Water Blue (#0E87CC) |
| Black text | 5.22:1 |
| White text | 4.01:1 |
Values
| HEX | #3F7FD7 |
| RGB | rgb(63, 127, 215) |
| HSL | hsl(215, 66%, 55%) |
| OKLCH | oklch(59.8% 0.15 257) |
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 #3F7FD7 | 4.01:1 | AA large text | Lc -72.6 | Content text, not long reading |
| Black text on #3F7FD7 | 5.22:1 | AA | Lc 37.0 | Non-text elements, placeholder text |
| #3F7FD7 text on white | 4.01:1 | AA large text | Lc 67.1 | Content text, not long reading |
| #3F7FD7 text on black | 5.22:1 | AA | Lc -34.5 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A3C3F0
oklch(80.9% 0.073 256.9)
-
Step 400
400
#70A2E9
oklch(70.6% 0.118 257.2)
-
Step 500
500 (this color)
#3F7FD7
oklch(59.8% 0.15 257)
-
Step 600
600
#2A71D0
oklch(55.6% 0.163 257.1)
-
Step 700
700
#1C5EB4
oklch(49.1% 0.151 257.1)
-
Step 800
800
#1A4D92
oklch(42.6% 0.126 257.3)
-
Step 900
900
#1C4174
oklch(37.7% 0.097 257.1)
-
Step 950
950
#112644
oklch(26.9% 0.062 257.5)
#3F7FD7 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) | #5586DA | 0.030 |
| Deuteranopia (no green cones) | #3D78D5 | 0.019 |
| Tritanopia (no blue cones) | #0094A0 | 0.119 |
| Achromatopsia (no color) | #7F7F7F | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7FD7
#3F7FD7
oklch(59.8% 0.15 257)
- #A97400
#A97400
oklch(59.8% 0.125 77)
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 #3F7FD7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Water Blue #0E87CC ΔE 0.037
- Windows Blue #3778BF ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.043
- Cool Blue #4984B8 ΔE 0.053
- Soft Blue #6488EA ΔE 0.055
- Steel Blue #4682B4 ΔE 0.057
- Royal Blue #4169E1 ΔE 0.061
- Clear Blue #247AFD ΔE 0.062
Use #3F7FD7 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.