#5559B0
Closest named color: Iris (#6258C4). oklch(50.5% 0.136 278.4), rgb(85, 89, 176).
Aa
White text reads best on this color (6.10:1).
About this color
#5559B0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.136 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.037 away. White text reads best on it, at 6.10:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.44:1 |
| White text | 6.10:1 |
Values
| HEX | #5559B0 |
| RGB | rgb(85, 89, 176) |
| HSL | hsl(237, 37%, 51%) |
| OKLCH | oklch(50.5% 0.136 278.4) |
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 #5559B0 | 6.10:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #5559B0 | 3.44:1 | AA large text | Lc 23.8 | Dividers and decoration only |
| #5559B0 text on white | 6.10:1 | AA | Lc 80.3 | Fine for body text |
| #5559B0 text on black | 3.44:1 | AA large text | Lc -21.6 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D3D7F2
oklch(88.4% 0.037 278.9)
-
Step 300
300
#B6BDEB
oklch(80.9% 0.065 278.1)
-
Step 400
400
#929AE1
oklch(70.8% 0.104 278.4)
-
Step 500
500
#787FD9
oklch(63.1% 0.134 278.4)
-
Step 600
600
#6267C6
oklch(55.6% 0.145 278.3)
-
Step 700
700 (this color)
#5559B0
oklch(50.5% 0.136 278.4)
-
Step 800
800
#42468B
oklch(42.7% 0.112 278)
-
Step 900
900
#383B6F
oklch(37.7% 0.088 278.8)
-
Step 950
950
#212341
oklch(27% 0.055 279.1)
#5559B0 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) | #3066B3 | 0.049 |
| Deuteranopia (no green cones) | #275FAE | 0.051 |
| Tritanopia (no blue cones) | #2F6C7C | 0.118 |
| Achromatopsia (no color) | #626262 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5559B0
#5559B0
oklch(50.5% 0.136 278.4)
- #746500
#746500
oklch(50.6% 0.105 99.1)
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 #5559B0, closest first.
No curated palette has a color within ΔE 0.04 of #5559B0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.037
- French Blue #436BAD ΔE 0.052
- Dusky Blue #475F94 ΔE 0.054
- Slate Blue #6A5ACD ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.059
- Mid Blue #276AB3 ΔE 0.060
- Light Indigo #6D5ACF ΔE 0.061
- Denim Blue #3B5B92 ΔE 0.061
Use #5559B0 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.