#5558BB
Closest named color: Iris (#6258C4). oklch(51.1% 0.153 278.2), rgb(85, 88, 187).
Aa
White text reads best on this color (6.00:1).
About this color
#5558BB is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.153 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.024 away. White text reads best on it, at 6.00:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.49:1 |
| White text | 6.00:1 |
Values
| HEX | #5558BB |
| RGB | rgb(85, 88, 187) |
| HSL | hsl(238, 43%, 53%) |
| OKLCH | oklch(51.1% 0.153 278.2) |
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 #5558BB | 6.00:1 | AA | Lc -84.9 | Fine for body text |
| Black text on #5558BB | 3.49:1 | AA large text | Lc 24.3 | Dividers and decoration only |
| #5558BB text on white | 6.00:1 | AA | Lc 79.7 | Fine for body text |
| #5558BB text on black | 3.49:1 | AA large text | Lc -22.1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D2D7F5
oklch(88.5% 0.042 278)
-
Step 300
300
#B5BDF0
oklch(81% 0.073 277.7)
-
Step 400
400
#9099E9
oklch(70.8% 0.117 278.1)
-
Step 500
500
#767DE3
oklch(63.1% 0.152 278.2)
-
Step 600
600
#6064D0
oklch(55.6% 0.163 278.1)
-
Step 700
700 (this color)
#5558BB
oklch(51.1% 0.153 278.2)
-
Step 800
800
#414492
oklch(42.7% 0.126 278)
-
Step 900
900
#373A74
oklch(37.7% 0.097 278.4)
-
Step 950
950
#202244
oklch(26.9% 0.063 278.8)
#5558BB 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) | #2067BE | 0.059 |
| Deuteranopia (no green cones) | #0D5FB9 | 0.063 |
| Tritanopia (no blue cones) | #246E81 | 0.132 |
| Achromatopsia (no color) | #636363 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5558BB
#5558BB
oklch(51.1% 0.153 278.2)
- #766600
#766600
oklch(51% 0.106 98.4)
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 #5558BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.024
- Slate Blue #6A5ACD ΔE 0.043
- Dark Periwinkle #665FD1 ΔE 0.046
- Light Indigo #6D5ACF ΔE 0.049
- Warm Blue #4B57DB ΔE 0.052
- Bluey Purple #6241C7 ΔE 0.057
- French Blue #436BAD ΔE 0.060
- Mid Blue #276AB3 ΔE 0.065
Use #5558BB 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.