#3643AA
Closest named color: Sapphire (#2138AB). oklch(43.7% 0.164 272.2), rgb(54, 67, 170).
Aa
White text reads best on this color (8.26:1).
About this color
#3643AA is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.164 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.039 away. White text reads best on it, at 8.26:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.54:1 |
| White text | 8.26:1 |
Values
| HEX | #3643AA |
| RGB | rgb(54, 67, 170) |
| HSL | hsl(233, 52%, 44%) |
| OKLCH | oklch(43.7% 0.164 272.2) |
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 #3643AA | 8.26:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #3643AA | 2.54:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #3643AA text on white | 8.26:1 | AAA | Lc 88.1 | Fine for body text |
| #3643AA text on black | 2.54:1 | Fails | Lc -14.1 | Not readable |
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 800.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CDD8FD
oklch(88.6% 0.052 272.2)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8098FF
oklch(70.7% 0.153 272.1)
-
Step 500
500
#637AFE
oklch(63.1% 0.196 272.1)
-
Step 600
600
#4D5FED
oklch(55.7% 0.213 272)
-
Step 700
700
#3F4DCE
oklch(49.1% 0.197 272.1)
-
Step 800
800 (this color)
#3643AA
oklch(43.7% 0.164 272.2)
-
Step 900
900
#2C3884
oklch(37.7% 0.128 272.1)
-
Step 950
950
#1A214D
oklch(26.9% 0.081 272.9)
#3643AA 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) | #0054AD | 0.050 |
| Deuteranopia (no green cones) | #0049A8 | 0.039 |
| Tritanopia (no blue cones) | #005D70 | 0.134 |
| Achromatopsia (no color) | #4E4E4E | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3643AA
#3643AA
oklch(43.7% 0.164 272.2)
- #634F00
#634F00
oklch(43.6% 0.089 92)
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 #3643AA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.039
- Blueberry #464196 ΔE 0.039
- Blue Blue #2242C7 ΔE 0.050
- Cobalt #1E488F ΔE 0.053
- Majorelle Blue #3F37C9 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.057
- Blue With A Hint Of Purple #533CC6 ΔE 0.062
- Dusk Blue #26538D ΔE 0.068
Use #3643AA 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.