#3975DC
Closest named color: Royal Blue (#4169E1). oklch(57.8% 0.17 260.4), rgb(57, 117, 220).
Aa
Black text reads best on this color (4.75:1).
About this color
#3975DC is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.170 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.032 away. Black text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.75:1 |
| White text | 4.41:1 |
Values
| HEX | #3975DC |
| RGB | rgb(57, 117, 220) |
| HSL | hsl(218, 70%, 54%) |
| OKLCH | oklch(57.8% 0.17 260.4) |
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 #3975DC | 4.41:1 | AA large text | Lc -75.7 | Fine for body text |
| Black text on #3975DC | 4.75:1 | AA | Lc 33.8 | Non-text elements, placeholder text |
| #3975DC text on white | 4.41:1 | AA large text | Lc 70.2 | Content text, not long reading |
| #3975DC text on black | 4.75:1 | AA | Lc -31.4 | 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 600.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#C9DAF6
oklch(88.4% 0.043 260.4)
-
Step 300
300
#A4C2F3
oklch(80.9% 0.077 260.1)
-
Step 400
400
#74A1EC
oklch(70.8% 0.121 260.2)
-
Step 500
500
#4F87E7
oklch(63.2% 0.157 260.5)
-
Step 600
600 (this color)
#3975DC
oklch(57.8% 0.17 260.4)
-
Step 700
700
#255CB8
oklch(49.2% 0.157 260.2)
-
Step 800
800
#204B95
oklch(42.6% 0.131 260.5)
-
Step 900
900
#1F4077
oklch(37.8% 0.102 260)
-
Step 950
950
#132646
oklch(27.1% 0.065 260.2)
#3975DC 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) | #3D80E0 | 0.030 |
| Deuteranopia (no green cones) | #0F71DA | 0.027 |
| Tritanopia (no blue cones) | #008D9E | 0.132 |
| Achromatopsia (no color) | #787878 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3975DC
#3975DC
oklch(57.8% 0.17 260.4)
- #9E7000
#9E7000
oklch(57.7% 0.12 80)
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 #3975DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.032
- Cerulean Blue #056EEE ΔE 0.043
- Windows Blue #3778BF ΔE 0.047
- Clear Blue #247AFD ΔE 0.050
- Neon Blue #4361EE ΔE 0.057
- Water Blue #0E87CC ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.069
- Dark Sky Blue #448EE4 ΔE 0.069
Use #3975DC 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.