#3757BD
Closest named color: Warm Blue (#4B57DB). oklch(49.2% 0.165 267), rgb(55, 87, 189).
Aa
White text reads best on this color (6.44:1).
About this color
#3757BD is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.165 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.053 away. White text reads best on it, at 6.44:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.26:1 |
| White text | 6.44:1 |
Values
| HEX | #3757BD |
| RGB | rgb(55, 87, 189) |
| HSL | hsl(226, 55%, 48%) |
| OKLCH | oklch(49.2% 0.165 267) |
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 #3757BD | 6.44:1 | AA | Lc -86.7 | Fine for body text |
| Black text on #3757BD | 3.26:1 | AA large text | Lc 22.5 | Dividers and decoration only |
| #3757BD text on white | 6.44:1 | AA | Lc 81.6 | Fine for body text |
| #3757BD text on black | 3.26:1 | AA large text | Lc -20.3 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#A9C0F5
oklch(80.9% 0.079 266.4)
-
Step 400
400
#7D9DF0
oklch(70.7% 0.127 267.1)
-
Step 500
500
#5D82EB
oklch(63.1% 0.163 267.1)
-
Step 600
600
#4569D9
oklch(55.6% 0.176 267.1)
-
Step 700
700 (this color)
#3757BD
oklch(49.2% 0.165 267)
-
Step 800
800
#2D4799
oklch(42.6% 0.138 267.1)
-
Step 900
900
#283D79
oklch(37.7% 0.105 266.8)
-
Step 950
950
#182447
oklch(27% 0.067 267.5)
#3757BD 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) | #0665C1 | 0.041 |
| Deuteranopia (no green cones) | #0059BB | 0.032 |
| Tritanopia (no blue cones) | #007081 | 0.134 |
| Achromatopsia (no color) | #5E5E5E | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3757BD
#3757BD
oklch(49.2% 0.165 267)
- #7A5C00
#7A5C00
oklch(49.2% 0.101 86.4)
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 #3757BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.053
- Mid Blue #276AB3 ΔE 0.055
- Iris #6258C4 ΔE 0.059
- Blue Blue #2242C7 ΔE 0.059
- French Blue #436BAD ΔE 0.066
- Blue With A Hint Of Purple #533CC6 ΔE 0.067
- Majorelle Blue #3F37C9 ΔE 0.071
- Denim Blue #3B5B92 ΔE 0.072
Use #3757BD 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.