#3975E9
Closest named color: Royal Blue (#4169E1). oklch(58.7% 0.187 261.9), rgb(57, 117, 233).
Aa
Black text reads best on this color (4.89:1).
About this color
#3975E9 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.187 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.031 away. Black text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.187) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.89:1 |
| White text | 4.28:1 |
Values
| HEX | #3975E9 |
| RGB | rgb(57, 117, 233) |
| HSL | hsl(220, 80%, 57%) |
| OKLCH | oklch(58.7% 0.187 261.9) |
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 #3975E9 | 4.28:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #3975E9 | 4.89:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #3975E9 text on white | 4.28:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #3975E9 text on black | 4.89:1 | AA | Lc -32.5 | 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 600.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C8DAF9
oklch(88.5% 0.047 261.4)
-
Step 300
300
#A3C1F8
oklch(80.8% 0.085 262.3)
-
Step 400
400
#719FF4
oklch(70.6% 0.135 261.9)
-
Step 500
500
#4C85F0
oklch(63.2% 0.172 261.7)
-
Step 600
600 (this color)
#3975E9
oklch(58.7% 0.187 261.9)
-
Step 700
700
#2359C1
oklch(49.2% 0.173 261.8)
-
Step 800
800
#1E499C
oklch(42.6% 0.144 261.8)
-
Step 900
900
#1E3E7C
oklch(37.7% 0.112 262)
-
Step 950
950
#122549
oklch(27% 0.071 261.9)
#3975E9 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) | #2D83ED | 0.035 |
| Deuteranopia (no green cones) | #0072E7 | 0.028 |
| Tritanopia (no blue cones) | #0091A4 | 0.146 |
| Achromatopsia (no color) | #7A7A7A | 0.187 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3975E9
#3975E9
oklch(58.7% 0.187 261.9)
- #A07400
#A07400
oklch(58.8% 0.121 82)
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 #3975E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.031
- Clear Blue #247AFD ΔE 0.032
- Cerulean Blue #056EEE ΔE 0.034
- Neon Blue #4361EE ΔE 0.048
- Bright Blue #0165FC ΔE 0.059
- Cornflower #6A79F7 ΔE 0.059
- Azul #1D5DEC ΔE 0.065
- Windows Blue #3778BF ΔE 0.067
Use #3975E9 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.