#3753BF
Closest named color: Blue Blue (#2242C7). oklch(48.6% 0.172 268.2), rgb(55, 83, 191).
Aa
White text reads best on this color (6.66:1).
About this color
#3753BF is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.172 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.049 away. White text reads best on it, at 6.66:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.172) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 3.15:1 |
| White text | 6.66:1 |
Values
| HEX | #3753BF |
| RGB | rgb(55, 83, 191) |
| HSL | hsl(228, 55%, 48%) |
| OKLCH | oklch(48.6% 0.172 268.2) |
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 #3753BF | 6.66:1 | AA | Lc -87.5 | Fine for body text |
| Black text on #3753BF | 3.15:1 | AA large text | Lc 21.6 | Dividers and decoration only |
| #3753BF text on white | 6.66:1 | AA | Lc 82.4 | Fine for body text |
| #3753BF text on black | 3.15:1 | AA large text | Lc -19.5 | 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
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CCD9F9
oklch(88.6% 0.046 267.9)
-
Step 300
300
#AABFF7
oklch(80.9% 0.083 268.6)
-
Step 400
400
#7D9CF4
oklch(70.7% 0.134 268.2)
-
Step 500
500
#5E81F0
oklch(63.2% 0.171 268.1)
-
Step 600
600
#4667DE
oklch(55.6% 0.185 268.1)
-
Step 700
700 (this color)
#3753BF
oklch(48.6% 0.172 268.2)
-
Step 800
800
#2F469C
oklch(42.7% 0.143 268.4)
-
Step 900
900
#293C7C
oklch(37.8% 0.111 268.3)
-
Step 950
950
#182449
oklch(27.2% 0.071 268)
#3753BF 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) | #0063C3 | 0.045 |
| Deuteranopia (no green cones) | #0056BD | 0.033 |
| Tritanopia (no blue cones) | #006D81 | 0.137 |
| Achromatopsia (no color) | #5C5C5C | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3753BF
#3753BF
oklch(48.6% 0.172 268.2)
- #765B00
#765B00
oklch(48.5% 0.099 88.5)
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 #3753BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.049
- Warm Blue #4B57DB ΔE 0.052
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Majorelle Blue #3F37C9 ΔE 0.060
- Iris #6258C4 ΔE 0.062
- Mid Blue #276AB3 ΔE 0.065
- Blurple #5539CC ΔE 0.066
- Bluey Purple #6241C7 ΔE 0.069
Use #3753BF 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.