#555DBF
Closest named color: Iris (#6258C4). oklch(52.3% 0.151 276.3), rgb(85, 93, 191).
Aa
White text reads best on this color (5.66:1).
About this color
#555DBF is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.151 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.023 away. White text reads best on it, at 5.66:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.70:1 |
| White text | 5.66:1 |
Values
| HEX | #555DBF |
| RGB | rgb(85, 93, 191) |
| HSL | hsl(235, 45%, 54%) |
| OKLCH | oklch(52.3% 0.151 276.3) |
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 #555DBF | 5.66:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #555DBF | 3.70:1 | AA large text | Lc 26.0 | Dividers and decoration only |
| #555DBF text on white | 5.66:1 | AA | Lc 78.1 | Fine for body text |
| #555DBF text on black | 3.70:1 | AA large text | Lc -23.7 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D1D7F5
oklch(88.4% 0.042 276.6)
-
Step 300
300
#B3BDF0
oklch(80.8% 0.073 276)
-
Step 400
400
#8D99E9
oklch(70.6% 0.118 276.4)
-
Step 500
500
#737EE2
oklch(63.1% 0.149 276.5)
-
Step 600
600
#5D65D0
oklch(55.6% 0.163 276.5)
-
Step 700
700 (this color)
#555DBF
oklch(52.3% 0.151 276.3)
-
Step 800
800
#3F4592
oklch(42.8% 0.125 276.4)
-
Step 900
900
#353B74
oklch(37.8% 0.096 276.2)
-
Step 950
950
#1F2344
oklch(27.1% 0.061 276.3)
#555DBF 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) | #296BC2 | 0.052 |
| Deuteranopia (no green cones) | #1763BD | 0.057 |
| Tritanopia (no blue cones) | #1D7385 | 0.133 |
| Achromatopsia (no color) | #676767 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555DBF
#555DBF
oklch(52.3% 0.151 276.3)
- #7C6900
#7C6900
oklch(52.3% 0.108 96.6)
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 #555DBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.023
- Dark Periwinkle #665FD1 ΔE 0.038
- Slate Blue #6A5ACD ΔE 0.038
- Light Indigo #6D5ACF ΔE 0.044
- Warm Blue #4B57DB ΔE 0.049
- French Blue #436BAD ΔE 0.054
- Mid Blue #276AB3 ΔE 0.059
- Royal Blue #4169E1 ΔE 0.060
Use #555DBF 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.