#3A51BB
Closest named color: Blue Blue (#2242C7). oklch(48% 0.169 269.7), rgb(58, 81, 187).
Aa
White text reads best on this color (6.83:1).
About this color
#3A51BB is a medium-dark, vivid blue. In OKLCH its lightness is 48%, its chroma 0.169 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.050 away. White text reads best on it, at 6.83:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 3.07:1 |
| White text | 6.83:1 |
Values
| HEX | #3A51BB |
| RGB | rgb(58, 81, 187) |
| HSL | hsl(229, 53%, 48%) |
| OKLCH | oklch(48% 0.169 269.7) |
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 #3A51BB | 6.83:1 | AA | Lc -88.2 | Fine for body text |
| Black text on #3A51BB | 3.07:1 | AA large text | Lc 20.9 | Dividers and decoration only |
| #3A51BB text on white | 6.83:1 | AA | Lc 83.1 | Fine for body text |
| #3A51BB text on black | 3.07:1 | AA large text | Lc -18.8 | 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
#CDD8F8
oklch(88.4% 0.046 270.4)
-
Step 300
300
#ACBFF6
oklch(81% 0.081 269.7)
-
Step 400
400
#809CF2
oklch(70.8% 0.13 269.2)
-
Step 500
500
#6280ED
oklch(63.1% 0.167 269.6)
-
Step 600
600
#4B67DC
oklch(55.7% 0.181 269.5)
-
Step 700
700 (this color)
#3A51BB
oklch(48% 0.169 269.7)
-
Step 800
800
#32469A
oklch(42.7% 0.139 269.6)
-
Step 900
900
#2B3C7B
oklch(37.8% 0.109 269.3)
-
Step 950
950
#192348
oklch(26.9% 0.07 269.8)
#3A51BB 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) | #0061BF | 0.047 |
| Deuteranopia (no green cones) | #0055B9 | 0.037 |
| Tritanopia (no blue cones) | #006B7E | 0.137 |
| Achromatopsia (no color) | #5B5B5B | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A51BB
#3A51BB
oklch(48% 0.169 269.7)
- #735A00
#735A00
oklch(47.9% 0.098 89.9)
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 #3A51BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.050
- Blue With A Hint Of Purple #533CC6 ΔE 0.055
- Warm Blue #4B57DB ΔE 0.057
- Majorelle Blue #3F37C9 ΔE 0.058
- Iris #6258C4 ΔE 0.062
- Blurple #5539CC ΔE 0.064
- Bluey Purple #6241C7 ΔE 0.066
- Mid Blue #276AB3 ΔE 0.068
Use #3A51BB 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.