#3D51B5
Closest named color: Blue Blue (#2242C7). oklch(47.7% 0.159 270.7), rgb(61, 81, 181).
Aa
White text reads best on this color (6.90:1).
About this color
#3D51B5 is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.159 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.056 away. White text reads best on it, at 6.90:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 3.04:1 |
| White text | 6.90:1 |
Values
| HEX | #3D51B5 |
| RGB | rgb(61, 81, 181) |
| HSL | hsl(230, 50%, 47%) |
| OKLCH | oklch(47.7% 0.159 270.7) |
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 #3D51B5 | 6.90:1 | AA | Lc -88.5 | Fine for body text |
| Black text on #3D51B5 | 3.04:1 | AA large text | Lc 20.6 | Dividers and decoration only |
| #3D51B5 text on white | 6.90:1 | AA | Lc 83.5 | Fine for body text |
| #3D51B5 text on black | 3.04:1 | AA large text | Lc -18.5 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CED8F6
oklch(88.4% 0.043 270.9)
-
Step 300
300
#AEBFF3
oklch(81% 0.076 270.6)
-
Step 400
400
#849CEE
oklch(70.8% 0.123 270.6)
-
Step 500
500
#6681E8
oklch(63.2% 0.157 270.3)
-
Step 600
600
#4F67D6
oklch(55.5% 0.172 270.7)
-
Step 700
700 (this color)
#3D51B5
oklch(47.7% 0.159 270.7)
-
Step 800
800
#354696
oklch(42.6% 0.132 270.8)
-
Step 900
900
#2E3C78
oklch(37.8% 0.103 270.9)
-
Step 950
950
#1B2446
oklch(27.1% 0.064 270.5)
#3D51B5 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) | #0060B8 | 0.048 |
| Deuteranopia (no green cones) | #0055B3 | 0.041 |
| Tritanopia (no blue cones) | #00697B | 0.132 |
| Achromatopsia (no color) | #5A5A5A | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D51B5
#3D51B5
oklch(47.7% 0.159 270.7)
- #725A00
#725A00
oklch(47.8% 0.098 90.6)
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 #3D51B5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.056
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Blueberry #464196 ΔE 0.061
- Iris #6258C4 ΔE 0.062
- Majorelle Blue #3F37C9 ΔE 0.064
- Warm Blue #4B57DB ΔE 0.064
- Denim Blue #3B5B92 ΔE 0.066
- Mid Blue #276AB3 ΔE 0.067
Use #3D51B5 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.