#3D66C7
Closest named color: Mid Blue (#276AB3). oklch(53.3% 0.158 264.4), rgb(61, 102, 199).
Aa
White text reads best on this color (5.35:1).
About this color
#3D66C7 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.158 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.039 away. White text reads best on it, at 5.35:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.92:1 |
| White text | 5.35:1 |
Values
| HEX | #3D66C7 |
| RGB | rgb(61, 102, 199) |
| HSL | hsl(222, 55%, 51%) |
| OKLCH | oklch(53.3% 0.158 264.4) |
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 #3D66C7 | 5.35:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #3D66C7 | 3.92:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #3D66C7 text on white | 5.35:1 | AA | Lc 76.3 | Fine for body text |
| #3D66C7 text on black | 3.92:1 | AA large text | Lc -25.4 | 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 600.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCD9F4
oklch(88.4% 0.04 265.1)
-
Step 300
300
#AAC1F0
oklch(81% 0.071 264.4)
-
Step 400
400
#7D9FE8
oklch(70.7% 0.114 264.6)
-
Step 500
500
#5C85E1
oklch(63% 0.146 264.5)
-
Step 600
600 (this color)
#3D66C7
oklch(53.3% 0.158 264.4)
-
Step 700
700
#355BB3
oklch(49.2% 0.147 264.2)
-
Step 800
800
#2C4A91
oklch(42.6% 0.123 264.5)
-
Step 900
900
#283F74
oklch(37.8% 0.095 264.6)
-
Step 950
950
#172544
oklch(27% 0.061 264.4)
#3D66C7 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) | #3071CB | 0.029 |
| Deuteranopia (no green cones) | #0465C5 | 0.034 |
| Tritanopia (no blue cones) | #007D8D | 0.128 |
| Achromatopsia (no color) | #6B6B6B | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D66C7
#3D66C7
oklch(53.3% 0.158 264.4)
- #8A6600
#8A6600
oklch(53.3% 0.109 84.2)
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 #3D66C7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.039
- Royal Blue #4169E1 ΔE 0.041
- French Blue #436BAD ΔE 0.046
- Warm Blue #4B57DB ΔE 0.050
- Windows Blue #3778BF ΔE 0.052
- Iris #6258C4 ΔE 0.054
- Dark Periwinkle #665FD1 ΔE 0.055
- Neon Blue #4361EE ΔE 0.062
Use #3D66C7 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.