#555AC6
Closest named color: Iris (#6258C4). oklch(52.2% 0.165 277), rgb(85, 90, 198).
Aa
White text reads best on this color (5.73:1).
About this color
#555AC6 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.165 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.019 away. White text reads best on it, at 5.73:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.66:1 |
| White text | 5.73:1 |
Values
| HEX | #555AC6 |
| RGB | rgb(85, 90, 198) |
| HSL | hsl(237, 50%, 55%) |
| OKLCH | oklch(52.2% 0.165 277) |
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 #555AC6 | 5.73:1 | AA | Lc -83.6 | Fine for body text |
| Black text on #555AC6 | 3.66:1 | AA large text | Lc 25.7 | Dividers and decoration only |
| #555AC6 text on white | 5.73:1 | AA | Lc 78.4 | Fine for body text |
| #555AC6 text on black | 3.66:1 | AA large text | Lc -23.4 | 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 700.
-
Step 50
50
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E6E9FA
oklch(93.7% 0.023 277.9)
-
Step 200
200
#D1D7F7
oklch(88.5% 0.044 277.1)
-
Step 300
300
#B3BCF5
oklch(80.8% 0.081 277.4)
-
Step 400
400
#8D98EF
oklch(70.7% 0.127 277.1)
-
Step 500
500
#737CEA
oklch(63.2% 0.163 277.1)
-
Step 600
600
#5D62D8
oklch(55.6% 0.177 277.1)
-
Step 700
700 (this color)
#555AC6
oklch(52.2% 0.165 277)
-
Step 800
800
#3F4398
oklch(42.8% 0.136 276.9)
-
Step 900
900
#353979
oklch(37.7% 0.107 277.3)
-
Step 950
950
#1F2247
oklch(27.1% 0.068 277.3)
#555AC6 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) | #116BCA | 0.064 |
| Deuteranopia (no green cones) | #0062C4 | 0.064 |
| Tritanopia (no blue cones) | #107387 | 0.145 |
| Achromatopsia (no color) | #666666 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555AC6
#555AC6
oklch(52.2% 0.165 277)
- #7B6900
#7B6900
oklch(52.2% 0.108 97.3)
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 #555AC6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.019
- Slate Blue #6A5ACD ΔE 0.033
- Dark Periwinkle #665FD1 ΔE 0.033
- Warm Blue #4B57DB ΔE 0.036
- Light Indigo #6D5ACF ΔE 0.039
- Royal Blue #4169E1 ΔE 0.055
- Bluey Purple #6241C7 ΔE 0.056
- Neon Blue #4361EE ΔE 0.065
Use #555AC6 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.