#4551A5
Closest named color: Twilight (#4E518B). oklch(47% 0.135 273.9), rgb(69, 81, 165).
Aa
White text reads best on this color (7.06:1).
About this color
#4551A5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.135 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.044 away. White text reads best on it, at 7.06:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.97:1 |
| White text | 7.06:1 |
Values
| HEX | #4551A5 |
| RGB | rgb(69, 81, 165) |
| HSL | hsl(233, 41%, 46%) |
| OKLCH | oklch(47% 0.135 273.9) |
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 #4551A5 | 7.06:1 | AAA | Lc -89.2 | Fine for body text |
| Black text on #4551A5 | 2.97:1 | Fails | Lc 19.8 | Dividers and decoration only |
| #4551A5 text on white | 7.06:1 | AAA | Lc 84.2 | Fine for body text |
| #4551A5 text on black | 2.97:1 | Fails | Lc -17.7 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D1D8F2
oklch(88.5% 0.037 273.7)
-
Step 300
300
#B3BEEB
oklch(80.8% 0.065 274.1)
-
Step 400
400
#8C9CE2
oklch(70.8% 0.104 273.6)
-
Step 500
500
#7181D9
oklch(63% 0.133 274.2)
-
Step 600
600
#5A69C7
oklch(55.6% 0.145 273.9)
-
Step 700
700 (this color)
#4551A5
oklch(47% 0.135 273.9)
-
Step 800
800
#3D488B
oklch(42.8% 0.111 273.8)
-
Step 900
900
#343D6F
oklch(37.8% 0.086 273.9)
-
Step 950
950
#1E2441
oklch(27% 0.055 273.4)
#4551A5 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) | #255DA8 | 0.042 |
| Deuteranopia (no green cones) | #1455A3 | 0.045 |
| Tritanopia (no blue cones) | #046473 | 0.119 |
| Achromatopsia (no color) | #585858 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4551A5
#4551A5
oklch(47% 0.135 273.9)
- #6D5900
#6D5900
oklch(47% 0.096 93.7)
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 #4551A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.044
- Blueberry #464196 ΔE 0.046
- Denim Blue #3B5B92 ΔE 0.046
- Dusky Blue #475F94 ΔE 0.052
- Dusk Blue #26538D ΔE 0.054
- Dusk #4E5481 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.063
- Light Navy Blue #2E5A88 ΔE 0.063
Use #4551A5 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.