#5599CF
Closest named color: Faded Blue (#658CBB). oklch(66.1% 0.106 244.4), rgb(85, 153, 207).
Aa
Black text reads best on this color (6.84:1).
About this color
#5599CF is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.106 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.041 away. Black text reads best on it, at 6.84:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.84:1 |
| White text | 3.06:1 |
Values
| HEX | #5599CF |
| RGB | rgb(85, 153, 207) |
| HSL | hsl(207, 56%, 57%) |
| OKLCH | oklch(66.1% 0.106 244.4) |
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 #5599CF | 3.06:1 | AA large text | Lc -62.8 | Content text, not long reading |
| Black text on #5599CF | 6.84:1 | AA | Lc 46.7 | Large or bold text, headings |
| #5599CF text on white | 3.06:1 | AA large text | Lc 57.4 | Large or bold text, headings |
| #5599CF text on black | 6.84:1 | AA | Lc -44.4 | Non-text elements, placeholder text |
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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A5C5E0
oklch(80.9% 0.052 243.9)
-
Step 400
400
#73A7D1
oklch(70.8% 0.083 243.7)
-
Step 500
500 (this color)
#5599CF
oklch(66.1% 0.106 244.4)
-
Step 600
600
#2B79B2
oklch(55.6% 0.116 244.5)
-
Step 700
700
#1D6699
oklch(49.2% 0.107 244.2)
-
Step 800
800
#1B537C
oklch(42.7% 0.089 244.6)
-
Step 900
900
#1D4564
oklch(37.7% 0.07 244.6)
-
Step 950
950
#12293A
oklch(27.1% 0.043 242.6)
#5599CF 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) | #819AD1 | 0.049 |
| Deuteranopia (no green cones) | #718ECE | 0.039 |
| Tritanopia (no blue cones) | #00A6AC | 0.084 |
| Achromatopsia (no color) | #939393 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5599CF
#5599CF
oklch(66.1% 0.106 244.4)
- #C08447
#C08447
oklch(66.2% 0.107 64.5)
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 #5599CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.052
- Cornflower Blue #6495ED ΔE 0.052
- Chefchaouen Blue #4895EF ΔE 0.053
- Greyblue #77A1B5 ΔE 0.061
- Silver Lake Blue #778DA9 ΔE 0.064
- Dusty Blue #5A86AD ΔE 0.064
- Cool Blue #4984B8 ΔE 0.065
Use #5599CF 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.