#3D55DD
Closest named color: Warm Blue (#4B57DB). oklch(51.7% 0.208 269.8), rgb(61, 85, 221).
Aa
White text reads best on this color (5.92:1).
About this color
#3D55DD is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.208 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.018 away. White text reads best on it, at 5.92:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.208) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.54:1 |
| White text | 5.92:1 |
Values
| HEX | #3D55DD |
| RGB | rgb(61, 85, 221) |
| HSL | hsl(231, 70%, 55%) |
| OKLCH | oklch(51.7% 0.208 269.8) |
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 #3D55DD | 5.92:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #3D55DD | 3.54:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #3D55DD text on white | 5.92:1 | AA | Lc 79.0 | Fine for body text |
| #3D55DD text on black | 3.54:1 | AA large text | Lc -22.8 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FE
oklch(93.5% 0.029 271.1)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7C9AFF
oklch(70.8% 0.152 269.7)
-
Step 500
500
#5C7CFF
oklch(63.1% 0.197 269.6)
-
Step 600
600
#445EF3
oklch(55.5% 0.224 269.8)
-
Step 700
700 (this color)
#3D55DD
oklch(51.7% 0.208 269.8)
-
Step 800
800
#2D40AB
oklch(42.7% 0.172 269.7)
-
Step 900
900
#273887
oklch(37.7% 0.133 269.7)
-
Step 950
950
#17224F
oklch(27.1% 0.084 269.7)
#3D55DD 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) | #006CE1 | 0.057 |
| Deuteranopia (no green cones) | #005DDA | 0.037 |
| Tritanopia (no blue cones) | #007891 | 0.165 |
| Achromatopsia (no color) | #646464 | 0.208 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D55DD
#3D55DD
oklch(51.7% 0.208 269.8)
- #806400
#806400
oklch(51.7% 0.106 89.4)
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 #3D55DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.018
- Azul #1D5DEC ΔE 0.035
- Neon Blue #4361EE ΔE 0.039
- Royal Blue #4169E1 ΔE 0.048
- Electric Blue #0652FF ΔE 0.062
- Bright Blue #0165FC ΔE 0.062
- Cerulean Blue #056EEE ΔE 0.064
- Iris #6258C4 ΔE 0.064
Use #3D55DD 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.