#3758E3
Closest named color: Azul (#1D5DEC). oklch(52.5% 0.214 267.8), rgb(55, 88, 227).
Aa
White text reads best on this color (5.72:1).
About this color
#3758E3 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.214 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Azul (#1D5DEC), ΔE 0.023 away. White text reads best on it, at 5.72:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.214) |
| Temperature | cool |
| Nearest name | Azul (#1D5DEC) |
| Black text | 3.66:1 |
| White text | 5.72:1 |
Values
| HEX | #3758E3 |
| RGB | rgb(55, 88, 227) |
| HSL | hsl(228, 75%, 55%) |
| OKLCH | oklch(52.5% 0.214 267.8) |
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 #3758E3 | 5.72:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #3758E3 | 3.66:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #3758E3 text on white | 5.72:1 | AA | Lc 78.0 | Fine for body text |
| #3758E3 text on black | 3.66:1 | AA large text | Lc -23.8 | Dividers and decoration only |
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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CAD9FE
oklch(88.6% 0.054 267.9)
-
Step 300
300
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#779BFF
oklch(70.7% 0.152 267.5)
-
Step 500
500
#567DFF
oklch(63% 0.198 267.8)
-
Step 600
600 (this color)
#3758E3
oklch(52.5% 0.214 267.8)
-
Step 700
700
#3250CF
oklch(49.1% 0.199 267.9)
-
Step 800
800
#2943A7
oklch(42.8% 0.164 267.7)
-
Step 900
900
#253A85
oklch(37.8% 0.128 267.9)
-
Step 950
950
#15234E
oklch(27.1% 0.081 267.2)
#3758E3 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) | #006EE8 | 0.053 |
| Deuteranopia (no green cones) | #005EE0 | 0.029 |
| Tritanopia (no blue cones) | #007C95 | 0.168 |
| Achromatopsia (no color) | #666666 | 0.214 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3758E3
#3758E3
oklch(52.5% 0.214 267.8)
- #846600
#846600
oklch(52.6% 0.107 88.4)
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 #3758E3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Azul #1D5DEC ΔE 0.023
- Warm Blue #4B57DB ΔE 0.025
- Neon Blue #4361EE ΔE 0.031
- Royal Blue #4169E1 ΔE 0.043
- Bright Blue #0165FC ΔE 0.050
- Electric Blue #0652FF ΔE 0.052
- Cerulean Blue #056EEE ΔE 0.053
- Dark Periwinkle #665FD1 ΔE 0.070
Use #3758E3 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.