#5599DD
Closest named color: Cornflower Blue (#6495ED). oklch(66.8% 0.123 250.2), rgb(85, 153, 221).
Aa
Black text reads best on this color (6.98:1).
About this color
#5599DD is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.123 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.032 away. Black text reads best on it, at 6.98:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 6.98:1 |
| White text | 3.00:1 |
Values
| HEX | #5599DD |
| RGB | rgb(85, 153, 221) |
| HSL | hsl(210, 67%, 60%) |
| OKLCH | oklch(66.8% 0.123 250.2) |
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 #5599DD | 3.00:1 | AA large text | Lc -61.9 | Content text, not long reading |
| Black text on #5599DD | 6.98:1 | AA | Lc 47.5 | Large or bold text, headings |
| #5599DD text on white | 3.00:1 | AA large text | Lc 56.5 | Large or bold text, headings |
| #5599DD text on black | 6.98:1 | AA | Lc -45.2 | Large or bold text, headings |
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 500.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DBEF
oklch(88.4% 0.034 251)
-
Step 300
300
#A4C4E7
oklch(80.9% 0.061 250.9)
-
Step 400
400
#71A5DB
oklch(70.7% 0.097 250.2)
-
Step 500
500 (this color)
#5599DD
oklch(66.8% 0.123 250.2)
-
Step 600
600
#2976BE
oklch(55.5% 0.134 250.5)
-
Step 700
700
#1A63A4
oklch(49.1% 0.125 250.3)
-
Step 800
800
#195185
oklch(42.7% 0.104 250.4)
-
Step 900
900
#1C446A
oklch(37.8% 0.079 249.7)
-
Step 950
950
#11283E
oklch(27% 0.05 249.3)
#5599DD 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) | #7C9CE0 | 0.044 |
| Deuteranopia (no green cones) | #698FDC | 0.031 |
| Tritanopia (no blue cones) | #00A9B1 | 0.099 |
| Achromatopsia (no color) | #959595 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5599DD
#5599DD
oklch(66.8% 0.123 250.2)
- #C48633
#C48633
oklch(66.8% 0.123 70.3)
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 #5599DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.032
- Chefchaouen Blue #4895EF ΔE 0.033
- Dark Sky Blue #448EE4 ΔE 0.039
- Soft Blue #6488EA ΔE 0.054
- Faded Blue #658CBB ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.069
- Water Blue #0E87CC ΔE 0.073
- Cool Blue #4984B8 ΔE 0.075
Use #5599DD 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.