#3750CB
Closest named color: Warm Blue (#4B57DB). oklch(49% 0.192 269.2), rgb(55, 80, 203).
Aa
White text reads best on this color (6.61:1).
About this color
#3750CB is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.192 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.040 away. White text reads best on it, at 6.61:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.192) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.17:1 |
| White text | 6.61:1 |
Values
| HEX | #3750CB |
| RGB | rgb(55, 80, 203) |
| HSL | hsl(230, 59%, 51%) |
| OKLCH | oklch(49% 0.192 269.2) |
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 #3750CB | 6.61:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #3750CB | 3.17:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #3750CB text on white | 6.61:1 | AA | Lc 82.2 | Fine for body text |
| #3750CB text on black | 3.17:1 | AA large text | Lc -19.7 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CBD8FC
oklch(88.4% 0.052 269.6)
-
Step 300
300
#A8BEFE
oklch(80.8% 0.094 269.6)
-
Step 400
400
#7B9AFD
oklch(70.6% 0.149 269.2)
-
Step 500
500
#5C7DFB
oklch(63.1% 0.191 269.3)
-
Step 600
600
#4562EA
oklch(55.5% 0.207 269.3)
-
Step 700
700 (this color)
#3750CB
oklch(49% 0.192 269.2)
-
Step 800
800
#2D43A4
oklch(42.7% 0.158 268.9)
-
Step 900
900
#283A82
oklch(37.7% 0.123 269.2)
-
Step 950
950
#17234C
oklch(27.1% 0.077 268.6)
#3750CB 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) | #0064CF | 0.051 |
| Deuteranopia (no green cones) | #0056C9 | 0.033 |
| Tritanopia (no blue cones) | #006F86 | 0.152 |
| Achromatopsia (no color) | #5D5D5D | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3750CB
#3750CB
oklch(49% 0.192 269.2)
- #775D00
#775D00
oklch(49.1% 0.1 89.6)
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 #3750CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.040
- Blue Blue #2242C7 ΔE 0.042
- Majorelle Blue #3F37C9 ΔE 0.051
- Blue With A Hint Of Purple #533CC6 ΔE 0.052
- Blurple #5539CC ΔE 0.057
- Azul #1D5DEC ΔE 0.059
- Iris #6258C4 ΔE 0.065
- Bluey Purple #6241C7 ΔE 0.065
Use #3750CB 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.