#3661D1
Closest named color: Royal Blue (#4169E1). oklch(52.7% 0.18 264.9), rgb(54, 97, 209).
Aa
White text reads best on this color (5.54:1).
About this color
#3661D1 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.180 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.034 away. White text reads best on it, at 5.54:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 3.78:1 |
| White text | 5.54:1 |
Values
| HEX | #3661D1 |
| RGB | rgb(54, 97, 209) |
| HSL | hsl(223, 63%, 52%) |
| OKLCH | oklch(52.7% 0.18 264.9) |
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 #3661D1 | 5.54:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #3661D1 | 3.78:1 | AA large text | Lc 26.8 | Dividers and decoration only |
| #3661D1 text on white | 5.54:1 | AA | Lc 77.2 | Fine for body text |
| #3661D1 text on black | 3.78:1 | AA large text | Lc -24.5 | 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 600.
-
Step 50
50
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CBD9F8
oklch(88.5% 0.045 266.2)
-
Step 300
300
#A7C0F6
oklch(80.8% 0.082 265.3)
-
Step 400
400
#799EF1
oklch(70.7% 0.129 265)
-
Step 500
500
#5783EC
oklch(63% 0.165 264.9)
-
Step 600
600 (this color)
#3661D1
oklch(52.7% 0.18 264.9)
-
Step 700
700
#3058BE
oklch(49.2% 0.167 264.7)
-
Step 800
800
#28489A
oklch(42.7% 0.139 265)
-
Step 900
900
#253D7A
oklch(37.6% 0.108 265.4)
-
Step 950
950
#162448
oklch(26.9% 0.07 265.9)
#3661D1 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) | #0370D5 | 0.040 |
| Deuteranopia (no green cones) | #0062CF | 0.027 |
| Tritanopia (no blue cones) | #007C8F | 0.143 |
| Achromatopsia (no color) | #686868 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3661D1
#3661D1
oklch(52.7% 0.18 264.9)
- #876500
#876500
oklch(52.7% 0.108 85.4)
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 #3661D1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.034
- Warm Blue #4B57DB ΔE 0.034
- Azul #1D5DEC ΔE 0.046
- Neon Blue #4361EE ΔE 0.047
- Cerulean Blue #056EEE ΔE 0.054
- Mid Blue #276AB3 ΔE 0.056
- Iris #6258C4 ΔE 0.058
- Dark Periwinkle #665FD1 ΔE 0.058
Use #3661D1 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.