#5A66BE
Closest named color: Iris (#6258C4). oklch(54.4% 0.137 275.1), rgb(90, 102, 190).
Aa
White text reads best on this color (5.14:1).
About this color
#5A66BE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.137 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.038 away. White text reads best on it, at 5.14:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 4.07:1 |
| White text | 5.14:1 |
Values
| HEX | #5A66BE |
| RGB | rgb(90, 102, 190) |
| HSL | hsl(233, 43%, 55%) |
| OKLCH | oklch(54.4% 0.137 275.1) |
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 #5A66BE | 5.14:1 | AA | Lc -80.7 | Fine for body text |
| Black text on #5A66BE | 4.07:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #5A66BE text on white | 5.14:1 | AA | Lc 75.3 | Fine for body text |
| #5A66BE text on black | 4.07:1 | AA large text | Lc -26.4 | 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 600.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8F0
oklch(88.5% 0.034 274.5)
-
Step 300
300
#B5BEE9
oklch(80.9% 0.062 275.7)
-
Step 400
400
#8F9CDE
oklch(70.8% 0.098 275.1)
-
Step 500
500
#7482D5
oklch(63.2% 0.126 275)
-
Step 600
600 (this color)
#5A66BE
oklch(54.4% 0.137 275.1)
-
Step 700
700
#4D58A8
oklch(49.2% 0.127 274.8)
-
Step 800
800
#3F4888
oklch(42.7% 0.106 275)
-
Step 900
900
#353D6D
oklch(37.7% 0.082 274.6)
-
Step 950
950
#1F2440
oklch(27% 0.052 274.7)
#5A66BE 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) | #3F72C1 | 0.040 |
| Deuteranopia (no green cones) | #3469BC | 0.042 |
| Tritanopia (no blue cones) | #2D7989 | 0.120 |
| Achromatopsia (no color) | #6D6D6D | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5A66BE
#5A66BE
oklch(54.4% 0.137 275.1)
- #846E00
#846E00
oklch(54.3% 0.112 95.1)
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 #5A66BE, closest first.
No curated palette has a color within ΔE 0.04 of #5A66BE.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.038
- Dark Periwinkle #665FD1 ΔE 0.039
- French Blue #436BAD ΔE 0.042
- Slate Blue #6A5ACD ΔE 0.044
- Light Indigo #6D5ACF ΔE 0.048
- Mid Blue #276AB3 ΔE 0.056
- Windows Blue #3778BF ΔE 0.056
- Royal Blue #4169E1 ΔE 0.059
Use #5A66BE 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.