#3757DE
Closest named color: Warm Blue (#4B57DB). oklch(51.9% 0.208 267.9), rgb(55, 87, 222).
Aa
White text reads best on this color (5.86:1).
About this color
#3757DE is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.208 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.023 away. White text reads best on it, at 5.86:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.208) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.58:1 |
| White text | 5.86:1 |
Values
| HEX | #3757DE |
| RGB | rgb(55, 87, 222) |
| HSL | hsl(229, 72%, 54%) |
| OKLCH | oklch(51.9% 0.208 267.9) |
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 #3757DE | 5.86:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #3757DE | 3.58:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #3757DE text on white | 5.86:1 | AA | Lc 78.7 | Fine for body text |
| #3757DE text on black | 3.58:1 | AA large text | Lc -23.1 | 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 700.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#789BFF
oklch(70.8% 0.152 267.9)
-
Step 500
500
#577DFF
oklch(63.1% 0.197 268)
-
Step 600
600
#3D60F4
oklch(55.6% 0.224 267.9)
-
Step 700
700 (this color)
#3757DE
oklch(51.9% 0.208 267.9)
-
Step 800
800
#2841AC
oklch(42.8% 0.173 267.9)
-
Step 900
900
#233988
oklch(37.8% 0.135 267.6)
-
Step 950
950
#15224F
oklch(27% 0.084 268.2)
#3757DE 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) | #006DE2 | 0.053 |
| Deuteranopia (no green cones) | #005DDB | 0.030 |
| Tritanopia (no blue cones) | #007A92 | 0.165 |
| Achromatopsia (no color) | #656565 | 0.209 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3757DE
#3757DE
oklch(51.9% 0.208 267.9)
- #826400
#826400
oklch(51.9% 0.106 88)
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 #3757DE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.023
- Azul #1D5DEC ΔE 0.029
- Neon Blue #4361EE ΔE 0.038
- Royal Blue #4169E1 ΔE 0.046
- Bright Blue #0165FC ΔE 0.057
- Electric Blue #0652FF ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.058
- Blue Blue #2242C7 ΔE 0.067
Use #3757DE 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.