#3751D0
Closest named color: Warm Blue (#4B57DB). oklch(49.6% 0.197 269), rgb(55, 81, 208).
Aa
White text reads best on this color (6.46:1).
About this color
#3751D0 is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.197 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.034 away. White text reads best on it, at 6.46:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.25:1 |
| White text | 6.46:1 |
Values
| HEX | #3751D0 |
| RGB | rgb(55, 81, 208) |
| HSL | hsl(230, 62%, 52%) |
| OKLCH | oklch(49.6% 0.197 269) |
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 #3751D0 | 6.46:1 | AA | Lc -86.6 | Fine for body text |
| Black text on #3751D0 | 3.25:1 | AA large text | Lc 22.6 | Dividers and decoration only |
| #3751D0 text on white | 6.46:1 | AA | Lc 81.5 | Fine for body text |
| #3751D0 text on black | 3.25:1 | AA large text | Lc -20.4 | 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
#CBD8FD
oklch(88.4% 0.053 270)
-
Step 300
300
#A7BEFF
oklch(80.8% 0.096 269.2)
-
Step 400
400
#7A9AFF
oklch(70.7% 0.152 269)
-
Step 500
500
#5A7DFE
oklch(63.2% 0.195 268.8)
-
Step 600
600
#4361ED
oklch(55.5% 0.213 269)
-
Step 700
700 (this color)
#3751D0
oklch(49.6% 0.197 269)
-
Step 800
800
#2C42A7
oklch(42.7% 0.164 268.9)
-
Step 900
900
#273984
oklch(37.6% 0.128 269.2)
-
Step 950
950
#17224D
oklch(26.9% 0.081 269.5)
#3751D0 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) | #0066D4 | 0.052 |
| Deuteranopia (no green cones) | #0057CE | 0.032 |
| Tritanopia (no blue cones) | #007189 | 0.155 |
| Achromatopsia (no color) | #5E5E5E | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3751D0
#3751D0
oklch(49.6% 0.197 269)
- #795E00
#795E00
oklch(49.5% 0.101 89.1)
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 #3751D0, closest first.
No curated palette has a color within ΔE 0.04 of #3751D0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.034
- Blue Blue #2242C7 ΔE 0.046
- Azul #1D5DEC ΔE 0.052
- Majorelle Blue #3F37C9 ΔE 0.054
- Blue With A Hint Of Purple #533CC6 ΔE 0.055
- Blurple #5539CC ΔE 0.058
- Neon Blue #4361EE ΔE 0.062
- Iris #6258C4 ΔE 0.065
Use #3751D0 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.